The slide deck review the occupational health and safety hazards and risks associated with the scientific construct of nanotechnology. It provides a basic understanding of how nanotechnology is very important aspect in pulmonary disease and toxicity other potential medical disorders and the need for hierarchy of controls, medical surveillance, and epidemiology to reduce risk of exposure during manufacture and breakdown of products containing nano particles. The life cycle analysis provides perspectives into the types of workers who maybe exposed.
Taking Stock of the OSH Challenges of Nanotechnology: 2000 - 2015
1. Taking Stock of the Occupational Safety and Health
Challenges of Nanotechnology: 2000-2015
Schulte, PA, Hodson LL, Murashov V, Hoover MD,
Zumwalde RD, Castranova V, Kuempel ED, Geraci CL,
Roth GA, Stefaniak AB, Howard J
National Institute for Occupational Safety and Health, USA
Disclaimer: The findings and conclusions in this report are those of the author and do not
necessarily represent the views of the National Institute for Occupational Safety and
Health.
2. Presentation Objectives
Describe nanotechnology
Summarize the last 15 years of progress since the inception of
commercial nanotechnology
Describe the efforts of the occupational safety and health
community
Identify what still needs to be accomplished
3. A New Technology
Illustrates the challenges to society of a new technology
Beneficial properties
Potential hazard
What to do when information is lacking or uncertain
4. Workers
Workers generally the first people in society exposed to a new
technology
Nanotechnology is not an exception
More than 1,000 nano-enabled products in commerce
Workers make and use them
6. Nanotechnology
Development of materials at the atomic, molecular, or
macromolecular levels with at least one dimension in the range of
1-100 nanometers
Creating and using structures, devices, and systems that have
novel properties and functions because of their small and/or
intermediate size
Ability to control or manipulate matter on the atomic scale
7. How little is “nano?”
If the diameter of the Earth represented
1 meter…
…1 nanometer
would be the size of a dime.
8. Size of Nanoparticles Relative to
Microorganisms and Cells
Influenza virus
75-100 nm
Tuberculosis bacteria
2,000 nm
Red blood cells
8,000 nm
9. From Milli to
Nano…
“Nano” is less than 100 nm
Welding fume
1.4 nm
Single-walled carbon
nanotubes
1 nm 10 nm 1 µm 10 µm100 nm
Dust collected 5 miles from
Mt. St. Helens
100 µm 1 mm
Respirable crystalline silica
Human Hair
~70 µm
10. Nanoparticles: Some Old, Some New
Naturally occurring Man-made
by-product
Engineered
Nanomaterials (ENM)
11. Not only smaller, but different
• Lower melting point
• Useful as catalyst
• Different color
• Different conductivity
Same Properties
60 nm bar
New Properties
30 nm bar
12. New Properties of Matter
Based on Size and Surface
Area
¼m
1nm
1m
GOLD
Each side = 1 meter
Mass ≈ 43,000 lb
Surface Area (SA) = 6 m2
≈ 8 ft x 8 ft room
Each side = 1/4 meter
Mass ≈ 43,000 lb
SA = 24 m2
Each side = 1 nanometer
Mass ≈ 43,000 lb
SA = 6 billion m2 ≈ 2500 miles2
Area of Delaware = 2490 miles2
ScalingcomparisoncourtesyofKristenKulinowski, Ph.D.
19. Why is nanotechnology of great interest?
Imparts useful properties to materials
Stronger
Lighter
More durable
Different melting temperatures
Enhanced electrical conductivity
More transistors on integrated chip
Enhanced chemical reactivity
All of these point to the possibility of creating new and very powerfulapplications.
20. Applications of Nanotechnology
Agriculture More efficient, targeted delivery of plant nutrients, pesticides
Automotive Lighter, stronger, self-healing materials
Biomedical Targeted therapeutics, enhanced detection, new structural
materials
Energy More efficient fuel cells, solar collectors
Environmental New pollution control and remediation tools, sensors
Food New safety sensors, food preservatives, nutrient additives
Materials Self-cleaning glass, stain resistant, stronger materials, body
armor
Water New purification approaches
21. Early Nano-Enabled Consumer Products are on
the Market Now [Gibbs 2006]
Eddie Bauer
Ruston Fit Nano-
Care khakis
Wilson Double
Core tennis balls
Kodak EasyShare
LS633 camera
Laufen Gallery washbasin
with Wondergliss
Smith & Nephew Acticoat 7
antimicrobial wound dressing
Samsung Nano
SilverSeal Refrigerator
24. Potential Revolution in Manufacturing
• See and
manipulate one
atom at a time –
building molecular
tools
– Using 35 Xenon
atoms to spell out
a logo
• Copy nature –
mimic self
replication
Source:IBMResearch
27. Background for Concerns
Ultrafines in air pollution epidemiology
Health effects of diesel and welding fumes
Metal fume fever
Fumed silica—acute pulmonary inflammation
Nanogold travel from nasal mucosa to brain (DeLorenzo 1970)
Animal pulmonary studies of ultrafine zinc respiratory effects
(Amdur et al. 1988)
28. National Science Foundation Workshop
September 28-29, 2000
Futuristic safety concerns
were envisioned early:
“As currently envisioned,
nano-mechanisms are likely to
possess at least three properties
that will generate novel safety
and governance challenges:
invisibility, micro-locomotion,
and self-replication.”
Page 214
29.
30. “Presumably nanoparticles must be handled with the same
care given to bio-organisms or radioactive substances.”
(p34) (Swiss Re, 2004)
31. The Royal Society & Royal Academy of Engineering
(2004)
“There are uncertainties about this risk of nanoparticulates currently
in production that need to be addressed immediately to
safeguard workers and consumers and support regulatory
decisions.”
32. The Royal Society & Royal Academy of Engineering
(2004)
“The evidence that we have reviewed suggests that manufactured
nanoparticles and nanotubes are likely to be more toxic per unit
mass than particles of the same chemical at larger size and will
therefore present a greater hazard.”
33. The Royal Society & Royal Academy of Engineering
(2004)
“Free particles in the nanometer size range do raise health,
environmental and safety concerns and their toxicology cannot be
inferred from that of particles of the same chemical at larger size.”
(p42)
34. Conceptual Timeline for Growth of Nanomaterial
Products and Workforce
NumberofProductsonEmerging
NanotechnologyInventoryasSurrogatesfor
VolumeofENMinCommerceandNumberof
Workers
1959
Feynman’s
Vision
1974
Taneguchi
“Nanotech-
nology”
1986
AFM
Invented
1990
First
Nanotech-
nology
Journal
2004
First
NanOEH
Conference
(Buxton)
2010 2015 2020
272
1300
(est.)
Initial calls for
precautions
1814 (est.)
Beginning of epidemiologic
surveillance and assessment of
precautionary guidance in use
More specific
precautionary
guidance
3400
36. Hazard Identification
“Is there reason to believe this
could be harmful?”
Risk Management
“Develop procedures to minimize
exposures.”
ExposureAssessment
“Will there be exposure in real-
world conditions?”
Risk Characterization
“Is substance hazardous and will
there be exposure?”
Key Elements
in Worker
Protection
37. Hazard Identification
“Is there reason to believe this
could be harmful?”
Risk Management
“Develop procedures to minimize
exposures.”
ExposureAssessment
“Will there be exposure in real-
world conditions?”
Risk Characterization
“Is substance hazardous and will
there be exposure?”
Hazard
Nanotoxicology
What do we know?
Are there “trends?”
Key Elements in
Worker
Protection
43. Toxicology
Particle and fiber toxicity paradigms underpin the majority of
toxicological investigations of ENMS
Confirmed that particle size is generally an important factor in
toxicity but other physico-chemical factors may play major roles
Confirmed that nanoparticles could reach the alveoli and could
enter the interstitium and blood stream
44. Toxicology
Pulmonary exposure to carbon nanotubes (CNTs) causes
alveolar interstitial fibrosis, which develops rapidly and is
persistent. Fibrotic potency appears related to the
physicochemical properties of the CNT
Pulmonary exposure to nanoparticles can cause cardiovascular
effects (alteration of heart rate and blood pressure, and
microvascular dysfunction)
45. Toxicology
Multi-walled carbon nanotubes (MWCNTs) (Mitsui-7) are a promoter of lung
cancer
Nanoparticles deposited in the lung can translocate to distal sites
Insoluble nanoparticles do not appear to rapidly cross intact skin or the GI
tract
Nanoparticle penetration through intact skin is not likely but exposure to
sensitizers and irritants still a concern
46. A single MWCNT penetrating from the subpleural tissue through the visceral pleura intothe
pleural space of a mouse is shown in the FESEM image of 7 D (80 μg dose, 56 day post-
aspiration).
Mercer et al. Particle and Fibre Toxicology 2010 7:28 doi:10.1186/1743-8977-7-28
47. Two dividing control cells with normal
centrosome morphology Courtesy Linda Sargent
51. Mitotic Spindle Aberrations
Following acute and chronic exposure to carbon nanotubes
SWCNT enter the nucleus, are integrated with microtubules and
centrosomes, are within the bridge separating dividing cells
• Fragment the centrosome
• Disrupt the mitotic spindle
• Induce aneuploidy
• Chemicals and fibers that induce centrosome damage, mitotic spindle damage and
aneuploidy increase risk of cancer
Linda Sargent, Ph.D.
Molecular Genetics Laboratory, NIOSH
52. H. F.Krttg
if@Md 001: 10.1(0l/a.rce,2014(•J;(i1
anosafety Research - A r c We on the Right Track ?
Hamid F.Krug
54. Hazard Identification
“Is there reason to believe this
could be harmful?”
Risk Management
“Develop procedures to minimize
exposures.”
ExposureAssessment
“Will there be exposure in real-
world conditions?”
Risk Characterization
“Is substance hazardous and will
there be exposure?”
Exposure
Can it be measured?
Where is it occurring?
Metric?
Key Elements in
Worker
Protection
55. Multiple Metrics Can Be Used to Assess Exposure
Mass: Links to historical data; lacks sensitivity and specificity
Size distribution: More information not always easy, not specific
Number concentration: Fairly simple with monitors, not specific
to particles, recent correlation of number in ambient air to
biomarkers of coronary heart disease
Surface area: Some relevance based on toxicology and
technology is available
“Each one may be right”
57. .eport of JJn.&.estigation
Reference Material® 8013
Gold Nanopa1ticles, Nominal 60 n1nDiameter
This Reference Material (RM) is intended primarily to evaluate and qualify methodology and/or instrument
performance related
biomedical research.
to the physical/dimensional characterization of nanoscale particles used in pre-clinical The RM
may also be useful in the development and evaluation of in vitro assays designed to
assess the biological response (e.g., cytotoxity, hemolysis) of nanomaterials, and for use in interlaborato 1y test
comparisons. RM 8013 consists of nominally 5 mL of citrate-stabilized Au nanopanicles in an aqueous suspension,
supplied in hermetical ly sealed pre-scored glass ampou les steri lized by gamma irradiation. A unit of RM8013 consists
of two 5 mL ampoules. The suspension contains primary particles (monomers) and a small percentage of clusters of
primary pa,ticlcs.
Expiration of Value Assignment: The reference values for RM 8013 are valid, Vithin the measurement uncenainty
specified, until 25 October 2018, provided the RM is handled and stored in accordance with the instructions given in
th is rcpori (sec "Notice and Warni ng to lJscrs"). This report is nul l ified if the R M is damaged, conlamfoaled, or
olherwise mod ified.
Maintenance of RM: NIST ,viii monitor this RM over the period of its validity. Ifsubstantive technical changes
occur thal affect lhe reference values before the expiration of this report, N lST will nolify lhe purchaser. Registration
(see attached sheet or register online) will facilitate notificatfon.
58. International Attention Needed to Resolve
Consensus on prioritization of RM needs
Harmonization of terminology
Poorly defined or qualitative measurements and lack of metrological traceability
Better understanding of measurement process
When RMs are not available, clarify when test materials can be useful for hypothesis testing
Stefaniak et al.(2013)
59. Exposure Assessment
Exposure to ENMs is:
Occurring, often episodic or task-based
Measurable
Many ENM emissions form agglomerates
Growing body of published exposure data
Importance of measuring background
International harmonization is occurring
60. Small Literature on Exposure
Relative newness of exposure scenarios
Uncertainties of what metric to use
Difficult getting entrance to worksites
Not a wide range of operations assessed
Little information on downstream users
63. Nanoparticle Emission Assessment Technique
(NEAT) for the Identification and Measurement
of Potential Inhalation Exposure to Engineered
Nanomaterials — PartA
and
Part B: Results from 12 Field Studies
M. Methner, L. Hodson, C. Geraci
National Institute for Occupational Safety and
Health (NIOSH), Nanotechnology Research
Center, Cincinnati, Ohio
Recent Published Summary of
Field Exposure Assessments
JournalofOccupationaland
EnvironmentalHygieneMarch 2010
64. Graded Approach to Measurement
• Step 1
– Particle counters and simple size analyzers to
screen the area and process
• Step 2
– Filter based samples for electron microscopy
and elemental analysis, collected at Source
• Step 3
– Filter based samples for electron microscopy
and elemental analysis, collected at Personal
Breathing Zone
• Step 4
– Less portable aerosol sizing equipment
66. Am,.Oc.:"up. llJg.,2015, VoL59, No.6,70$-i23
doi:10.1093iannl,yu•l'v020
Adv;in<eAe<esspubl i tion7ApriJ 2015
•-.c(,,;r,')l"!Q(')(t x-c :o,
w..1,'CfhOO<lhFror-ccrhn
Carbon Nanotube and Nanofiber Exposure
Assessments:An Analysis of 14Site Visits
Matthew M. Dahm' Mary K. Schubauer-Berigan1,
DouglasE..Evans2, M. Eileen Birchi,Joseph E. Fernbackl and
JamesA.Deddens'
1. lndcn:rywid<' S:udiM6un<h.0.vu or. NSorv('t.llMl r<'.Hurd Ev.afo11ti(lr,.u1d Pi<'ldStUdi<'S. N.AtiClll lMtitutt fo•Om1r.1tlon.1J 1i;:1fi'1rand
Hc-..!tl.1; 1091)Tu'4"1"1.1A,,:, MS•R14,C111u111ut1,OH Sl:26,US.;
l.Chnnlr.aJ Exposu:'t'ar.d MC'oitoting 8r.anch1UM.5ionofApplioo Rt.5Nrch ilndT«hnolcgy, N.nio:Wttu1itlt(' fo, Occll(Mtional Safl'ly nd I
l<'.ulb, l090il1,culU1r1Axt:.Cincinn:11i,OJ I4116,t.:S1
't,',d]u,;IV wlmm c.u;rt':,pvr.Jt'nu::.l1uu J bt .:JJ1 sed.TI: +l·Sl3..fS8·7l36;(.u.: +151J·84J ·+t86;t:·rnll :1n,hhm(.llcdc.g,;,¥
Submlrrtd 3!it"ptcmbrr 2014;mi$00 23J.amury2015: t t ist'd v,milOnacc.-:p1td2.2Ftbru.uy201S,
AJISTIUC.T
Recent evidence l.l$ suggc...tedthepoten tial For widc·r,mging llcaJth effect th.it couJdrcsuh fromupo·
sure to crhon n:inotubcc; (CNT) and c:arbn nanc)6hcr (CNF). In rc poMe, the Nationa.l ln.tt1tutt
for Om,p•tio<1al S..fel)' and He-1th (NIOSH) ,et•recomm<n d,Jcrposurc Limit (REL) fO<CNTand
CNF: l 1;1,gm 'a$;i,n S·h limt weighted aver.1ge (TWA) ofclcmcntal carbon (EC) forrht spirable siu
fr1<tion. The purpose o( thjs study w;1s to conduct 1 l l indtrywide exposure .i.SS-essment among US
CNT and CNF manufacturs.md users. Fourteen toul sites "';ere viiited to 1sseu exposott-s toC. n
( D sites) ,nd CNF (I site). Person,!breathing ion• (POZ) ,r.d aruiamples wm, col!tcted for both
the inhd1ble ,nd r,spirable r.1ass concentrotion of EC, using NIOSH Method SO.JO. lnhabble P8Z
s:timplcs were collcctc<I u ninesi:cs while !lt the remaining five s i t both respirablc and inhJ1:able, l'HZ
samples were collected siJc b;·-:;idc. TraNmi.$sion electron microscvpy (TEA,() PBZ an<l area s.im·
pies were alsocollected at the inhakibk sh.c fraction and analyzed to quantify andsi1.c CNT an<l CNF
agglomcntc :md fibrous cxpo5urcs.Rc-spira.blc EC PSZ concentrations ranged from 0.02 lo 2 94 pg
m·>with agcomctnc mean (GM) of0.34 gm·)and an 8-h TV/A o(O.l6 pg m l. PBZ s.uuJ1lts ;a1thP
inhabblcs1zc fraction for EC ranged (rom0.01 to 79.!,7 F&m >witha G·lo( 111t•gm..J. PBZsarnpls
:amlr«d byTEM )hawed co11cc;:1trations ranging from 0.0001lo 1.613CNT or CNF structm'S 1-.er
cml with GM o(0.008 and an $-h TWA concentration of 0.003.The most comnum Ct-:T n1ct1.l.l'e
site$,re found tobe hrgcragglomcrates in the2-Slllll nngc ;iswdlas agslomcr.,tcs >S 1,m.Ast:.tisti·
c:illy signifkant correlation was ol>Krvcd bctwc"-n the lnh.a ablc samples for the ma s of EC an<lstru<·
turc cou:n,br TEM (Sporman p•0 . 3 , . f' <0.000 1).O,,crnU, EC PBZand area rv.:snmplC!ii w·.-e
bc:lowthe NIOSH REL {96% wen: -<J g m >at thercspirabl,c iit'e fraction), while 3 0 of the inhal,1ble
P.82ECsampJeswerefound to be >l pgm·l. Untilmore information is known abuut healthdT'.1.lS
.U50('i.m:d with larger agglomt"ratcs. 11seems prurlcnl to :.11s::,t';SSworker cxpo:.urc tomrborne CNT anJ
CNFmaterialsby monitoring £C:itboth th, rl'Spir.ible an(I mhafable sin fr.actions. Concurrent TF.M
sJmplcs should be,oJlcc-wd toconfirm the prcsen<e ofCNT .ind CNF.
l(EYWOROS : carbo1, 1ianofibc1-s;(.l1bon o..notub..-s;cxp(});mc a :.cs:,u1cnt;no1nu11,.1 1.i1!s
68. ISSN 0 0 0 3 -4S 7S (.:>Al"-T>
ISSN 147;;;-3162(ONLINE)
The Annals Of
.''.l JTCRN:TIONiL SCll'.:NTII'JC J>URNAL
01 IHI- C A U A I I O I AND CON IKOL O r
WORK-RE..ATED JLL-HE.'U,TH
Occupational Hygiene
Volume S+ Number 6 August 2010
69. Images from field air
samples. Complex
nanomaterial shapes
in a complex matrix.
70. Exposure Data
Conclusions/Challenges
Exposure metrics and approaches need to be harmonized
Mass is still the primary metric
Mass and particle number might be a good association
Direct-reading approaches have a place
Agglomeration is a reality
Confirmatory methods are needed
71. Hazard Identification
“Is there reason to believe this
could be harmful?”
Risk Management
“Develop procedures to minimize
exposures.”
ExposureAssessment
“Will there be exposure in real-
world conditions?”
Risk Characterization
“Is substance hazardous and will
there be exposure?”
Risk
Hazard x Exposure
Key Elements in
Worker
Protection
72. Quantitative Risk Assessment (QRA)
The estimation of the severity and likelihood of adverse
responses associated with exposure to a hazardous agent
Can be used to estimate the exposure concentrations that are
likely—or unlikely—to cause adverse health effects in workers
Two sources for prediction
Animal data
Human (epidemiologic) data
73. Assume equal response to equivalent dose
Rat
Dose-response model
(particle surface area
dose in lungs)
Calculate lung tissue
benchmark dose
Working lifetime
exposure concentration*
Equivalent tissue dose
Estimated lung
deposition fraction
Recommended
exposure limit
Technical feasibility of
measurement and control
Extrapolate
(Adjust for species
differences in lung
surface area)
*Comparerat-basedriskestimateswithconfidenceintervalsfromhuman studies
Quantitative Risk Assessment in Developing
Recommended Exposure Limits for Nanoparticles
Human
75. Risk Assessment: Ultrafine (Nano) TiO2
• NIOSH draft recommended exposure
limits (RELs)
– 2.4 mg/m3 fine TiO2
– 0.3 mg/m3 ultrafine TiO2
– Reflects greater inflammation & tumor risk of
ultrafine on mass basis
• Key message: The OEL for a material in
its “large” form may not be appropriate for
the nano form.
77. Risk Assessment: Carbon Nanotubes
• Use data from Ma-Hock (2009)
– Wistar rats exposed 0.1, 0.5, 2.5 mg/m3 multiwall carbon
nanotubes (6 hr/day, 5 days/wk, 15 wks)
• OEL for a risk of pulmonary fibrosis at less than 1/1000
over a working lifetime
• Likely to be less than the limit of quantitation for organic
carbon i.e., < 7 g/m3
80. Hazard Identification
“Is there reason to believe this
could be harmful?”
Risk Management
“Develop procedures to minimize
exposures.”
ExposureAssessment
“Will there be exposure in real-
world conditions?”
Risk Characterization
“Is substance hazardous and will
there be exposure?”
Recognize and
Manage Risk
What works?
What has been used?
What can be reapplied?
Key Elements in
Worker
Protection
81. Risk Management
Follow hierarchy of controls
Establish OELs
Utilize Prevention through Design
Institute medical surveillance
Conduct epidemiological studies
82. Societal Level
Ethical principles
Workers have a right to safe and healthy
workplace and a right to know hazards
Employers have responsibility to provide safe
and healthy workplaces
Uncertainty and precaution
83. When hazard is uncertain,
precaution should be high
Schulte & Salamanca-Buentello [2007]
Hazard
Identification Risk
Assessment
and
Characterization
More Precautionary
Risk Communication
and Management
Less
Precautionary
Less
Certain
More Certain
86. Conventional controls should work
Exhaust Ventilation
Capture
Inertia
Dominants
Diffusion
Dominates
No
Capture
Air Stream
About
1 nm
Most
Fine
Dusts
Micro
Scale
200 to
300 nm
88. Air
Air
Concentration
m air
concentration
Concentration "With" due to use ofLEV
"Without" LEV LEV ('Yo)*
Manganese (Mn) Reactor c1eanout 3619 150 96
Silver (Ag) Reactor cleanout 6667 L714 74
Iron (Fe) Reactor clcanoul 714 41 94
Background (Reactor area Prior to
cleanout) ND ND NIA
91. Filtration Performance of an Example NIOSH Approved N95
Filtering Facepiece Respirator
n=5; error bars represent standard deviations
TSI 3160; Flow rate 85 L/min
94. Exposure Management
Control Banding—Concept
Low Dustiness Medium Dustiness High Dustiness
Hazard Group A
Small 1 1 1
Medium 1 1 2
Large 1 2 2
Hazard Group B
Small 1 1 1
Medium 1 2 2
Large 1 3 3
Hazard Group C
Small 1 1 2
Medium 2 3 3
Large 2 4 4
Hazard Group D
Small 2 2 3
Medium 3 4 4
Large 3 4 4
Hazard Group E
For all hazard group E substances, choose control approach 4
Parameters
Amount Used
Dustiness
Hazard Group (R-Phrase)
ilo.orgSource:T.J.Lentz, NIOSH
ControlApproach
1. General Ventilation
2. Engineering Control
3. Containment
4. SpecialistAdvice
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etu1.
97. Pauluhn
4
5
3
0
1
5
5000
MWCNT
2.5 µg/m3
CNT & CNF
7 µg/m3
MWCNT
30 µg/m3*
OELs for Carbon Nanotubes
OSHA Carbon black PEL
3500
Baytubes
MWCNT
50 µg/m3
OSHA Graphite PEL(respirable)
*Period-limited (15-yr)
Nanocyl NIOSH Japan
BSI—0.01 f/ml [benchmark exposure limit-BEL] high aspect ratio nanomaterials
–established at 1/10 asbestos OEL
OEL(µg/m3)
98. Anticipatory international consensus standards established at the
introductory stage of nanotechnology could potentially hinder the
“race to the bottom” where nations compete for jobs by lowering
national workplace safety standards.
Murashov et al. [2012]
103. Issues in Medical Surveillance for
Workers in Nanotechnology
NeedsAssessment
Is there a hazard?
Is there exposure?
What is the risk?
Decisions on Medical Surveillance
Medical Screening Systematic Data
Collection
Exposure
Registry
Hazard
Surveillance
104. Medical Surveillance
Insufficient scientific and medical evidence to recommend the specific
medical screening of workers potentially exposed to engineered
nanoparticles
If nanoparticles are composed of chemical or bulk material, for which
medical screening recommendations exist, these would apply to
nanomaterial workers
Analysis of change in frequency of adverse effects in worker groups is
warranted
Exposure registries may be useful in some situations
105. Value of medical screening
Lack of specific health end point
Hazard surveillance
Potential for exposure registry
Interim Guidance Issued by NIOSH
106. Medical Screening
Health Council of the Netherlands [2012]
No screening programmes are currently available, anywhere in
the world, for individuals who work with nanoparticles
107. NIOSH Recommendations for Surveillance among
Nano-workers: Specific Cases
Ultrafine titanium dioxide
Current Intelligence Bulletin
(CIB) recommends following
general guidance for
nanomaterials (NIOSH 2009)
Difference based on toxicological hazard (pulmonary fibrosis for CNT) at occupationally relevant exposure levels
Carbon nanotubes & nanofibers
CIB recommends employers
consider implementing medical
monitoring for workers exposed
to CNT or CNF at levels above
the recommended exposure limit
Baseline evaluation, spirometry,
chest x-rays, others
108. Epidemiology
Few epidemiological studies have been conducted
Difficult to identify workers exposed to specific nanomaterials
Difficult to form cohorts
Cross-sectional biomarkers studies have been initiated
Most biomarkers have not be validated for their positive predictive
value
110. RTI Contract Report [2014]
Flowchart of the uses of iron oxide nanoparticles
within key industries
111. First Wave of Epidemiological Studies of
Nanomaterials Workers
16 Studies Completed or Issued Abstracts
11 cross-sectional
5 longitudinal (panel studies)
Generally used biomarkers as
dependent variables
Generally had limited exposure
assessment
Small sample size
Exposures:
Carbon nanotubes
Nanosilver
Titanium dioxide
Iron oxide
Calcium carbonate
Nanogold
Carbon black
112. ?
?
?
?
Estimated number of workers actually
exposed to engineered nanoparticles
2000 2010 2015 2025
1000
10,000
100,000
1,000,000
10,000,000
NumberofWorkersExposed
Dilemmas in Identifying Workers Exposed to Engineered
Nanoparticles
1959
Feynman’s
vision
1990’s
Beginning of
commercialization Source: Schulte[2009]
Global employment estimated
USA employment estimated
[Roco & Bainbridge, 2005]
113. Conceptual Illustration of a
Nanomaterials Worker Health Study
Continued exposure assessment
• Register
workers
• Characterize
exposure
• Baseline health
assessment
• Epidemiologic
investigations
• Specimen
banking
Prospective studies of sub-cohorts
Biomarker
cross-sectional
(CS) studies
CS CS
Periodic medical monitoring
Timeline
Components
114. Registry of
NOAA exposure
CNT exposed workers cohort
Specific
TiO2 exposed workers cohort
Worker
inclusion
questionnaire
Prevalence & incidence morbidity
cross-sectional &
panelstudies
Mortality
data
Generalist CMR
job-exposure
matrices (JEM)
Generalist PM &
fibers JEM
(MatPUF, Ev@lutil)
Research & expertise
institutions: INRS, INERIS,
INSERM, CEA, …
Data on associated exposures
and potential confounders
data
Health care and
drug prescription
database
(SNIIRAM)
Hospital
discharge
summary (PMSI)
International
collaborative
studies
Perimeter of the integrated system for epi-surveillance and research on NOAA
InVS abilities in data gathering andabstracting Collaborative actions
Measurement
of ENM
exposure &
biomarker
studies
Epi-surveillance
& descriptive
statistics
General
prospective
follow-up
Causes of
death register
(CépiDC)
Declaration R-nano
Worker
follow-up
questionnaire
Guseva
Canu (2010)
115. Potential Objectives for Future Epidemiological
Research
Legacy nanomaterials
Carbon black
Nano-titanium dioxide
Harmonized global approach to epidemiologic studies of
engineered nanomaterials (ENMs)
Prospective studies
125. Examples of Government Guidance Documents
NIOSH
IRSST
BAuA
UK HSE
METI
JNIOSH
Safe Work
Australia
IRSST, Institut de Recherche Robert-Sauvé en Santé et en Sécuritédu
Travail
BAuA, (German) Federal Institute for Occupational Safety and Health
HSE, Health and Safety Executive
METI, Ministry of Economy, Trade and Industry (Japan)
JNIOSH, Japanese National Institute for Occupational Safety and
Health
126. Is risk management guidance being followed?
What is known? What is not known?
Guidance has been followed in
some cases
The extent of awareness and
adherence with exposure
controls and precautionary
guidance needs to be assessed
The effectiveness of adherence
with guidance needs to be
assessed – what works and
what doesn’t work
Additional targeting of guidance
may be needed for specific
workplaces and workforces
where adherence is low
129. Fused Filament Fabrication
Operation:
1. Thermoplastic heated in print head.
2. Print head scans platform, deposits plastic.
3. Thermoplastic cools and solidifies.
4. Platform lowers or print head raises.
Subsequent layers add height.
KeyAspects:
• Inexpensive (< $1,000)
• Poor resolution
• Thermoplastics only; additives (including
nanomaterials) are being explored
• Most common consumer 3D printing technology
Image source: Eva Wolf,2012.
130. Occupational Safety and Health Concerns
• Materials
– Nanomaterials (powders,
additives)
– Heavy metals
– Organic chemicals
(polymers/binders)
• Energy
– Thermal sources
– Lasers & electron beams
• Emissions
– Releases during operation
– Cleanliness of products
– Machine maintenance
• IH Practices
– Return of “cottage industry”
– New material testing
132. Generations of Nanomaterials
1st generation
2nd generation
3rd generation
4th generation
Passive nanomaterials
Active nanomaterials
Integrated system
Nano systems
133. The Long Run Trajectory in nanotechnology
Development
Shift from passive to active nanostructures [Subramanian et al.
2010]
An active nanostructure—“changes or evolves its state during
operation” [NSF 2006]
Structure, state, and/or properties change during their use
“…Build stuff that does stuff” [Smalley quoted in Maynard 2009]
135. 5 Types of Active Nanomaterials
1. Remote actuated active nanostructure:
Nanotechnology whose active principle is remotely activated or
sensed.
2. Environmentally responsive active nanostructure:
Nanotechnology that is sensitive to stimuli like pH, temperature,
light, oxidation-reduction, certain chemicals etc.
3. Miniaturized active nanostructure: Nanotechnology which is a
conceptual scaling down of larger devices and technologies to
the nanoscale.
136. 5 Types of Active Nanomaterials
(cont’d)
4. Hybrid active nanostructures:
Nanotechnology that involves uncommon combinations (biotic-
abiotic, organic-inorganic) of materials.
5. Transforming active nanostructures:
Nanotechnology that changes irreversibly during some stage of its
use or life.
138. Extrinsic Properties (cont’d)
Could have human health and environmental risks never before
encountered
Functionality associated with carefully engineered collection of
chemicals and components (what it does)
Becomes more than just the sum of its parts
139. Extrinsic Properties (cont’d)
We are moving to a world where knowing what something is
made of is no guarantee of how to handle it safely
When does engineering a substance at nanoscale lead to
deviation in its conventionally established risk profile?
141. Increasingly Sophisticated Nanomaterials
Since materials change during their use successive changes may
have unforeseen and unintended consequences
Challenges to re-think exposure scenarios
Could have unique risk profiles
Could have the potential to stress and force change in existing
regulatory frameworks
How do we anticipate the stresses?
142. leturnal of Oc.cupatiett!i.·ll ani E,i·.,•ironmen,.a,Hygie.ne,9: D12 D:22
ISSN: 1545-9624 print J1545-9632 onlioc
DOT: 10.1080il 545%24.2012.6ll2 l i
Commentary
Progression of Occupational Risk Management with
Advances in Nanomaterials
Vladimir Murashov, Paul Schulte, and John Howard
National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention,
Washington, D.C.
INTRODUCTION
anotedrnulogy h;1sbt',cm Louted as a lransfonualiv tt'.(;h
Nnology lhal wou ld encompass a broad rnngc of protlucls
am] applicalion are,as ancl improvt', urnny aspe,cls of human
life. As rnmolcdrnolugy urntures, lhc crnupkxiLy of iLs main
product. nano111aterials. increa!'-e. Four generations of nano
mat.erial!- have heen rletinecl by a Worlcl Technology Evalua
tion Center (WTEC) Report,('J namely, passive nanomaterials,
active nanomaterials. integrated nanosystems, and molecular
nanosystems. According to the Woodrow Wilson Nanotech
nology Consumer Product Inventory, V• there are over 1000
self-identified nano-enabled consumer products on the market.
Mosl of Lht'.se, proclui.;ls art bai:;e,tl on fi.ri:;l-gt',nt',ralion "passive'.
nanomaterials." Limited understanding of passive nanoma
krial ha.am.ls has challcng,xl trndilional occupalional heallh
ri:-k asscssrn(.111.arnl rnanagclllcnl. approaches. New approaches
including rmg,gest.ions for rhe development and adopt.ion of
proaeLiw approaches l.o nanolcchnology risk assesslllcnL and
control have heen propoerl(:;, I.Jnl ike reactive approache!-,
where risk control measures are applied to well characte1ized
hazards, proactive or anticipatory approaches aim at minimiz-
.'.'Ind nanosystems m.'ly present more compkx health risks th.·m
p;1ssivc nanomal,:rials,(10> risk asi:;,:ss1m:nt i:;tudies i:;pccifi.illy
directed at. these mater ials in the workplace need to he funded
anrlconducted.
ltwas recognized tlutnanotechnology and advanced nano
materia Jr; raise isr;uer; that are more compleir anrl far-reaching
than many other iimovations.'1 1
'•111erefore, approaches to the
overall risk governance of emerging tedmologies, which can
be defined as a comprehensive oversight framework encom
passing re.gulaLory and non-rt',gulalory approache,i:; lo rii:;k as
sessment and risk management, may need to be validated and
rnotlified as appropriaLe,.
Inlhis Cmmn..:nlary, soui..:of lhc compkx. issu,:spertaining
to the occupational safety anrl health risk i111plicat.io11sofactivc
nanomat.er ials anrl nanoyst.ems are explored.
NANOMATERIAL COMPLEXITY
Generations of Nanomaterials
Aclvancemc".nL of rnnoltdnmlogy can bt eharaclc".riL.e.cl by
a number of factors, such as the narnre of the manufacturing
proc,:sscs used Lopnx.lucc nanolilaLeriali:;, bn:.aclLhofnanoL,:ch-
143. Future Needs
• More standardized toxicological studies
with better particle characterization
• Develop refined metrological approaches
• More collection, collation, publication and
meta-analysis of exposure data
• More attention to toxicity and exposure to
advanced ENMs
• Further development of categorical
approaches for risk assessment and
management
• Refined medical surveillance guidance
• More epidemiologic studies
• Global assessment of compliance to risk
management guidance