4. Recognition Evaluation Control
Occupational hygiene is about preventing ill
health at work
5. Recognition Evaluation Control
Measuring exposure to hazardous
substances can be an important part of that
process
6.
7. A new Workplace Exposure Limit (WEL) has
recently been introduced for sulphuric acid mist
8. It’s the first limit to be specified as the thoracic
fraction
9. The “thoracic
fraction” includes
those particles that
can deposit in the
regions of the
respiratory system
coloured blue and
pink on this diagram
Image Source: http://www.skcinc.com
14. Criteria for selecting a suitable
method:
Specificity
Sensitivity
preferably can detect
concentrations as low as 1/10th
of the WEL (i.e. 0.005mg/m3)
15. Criteria for selecting a suitable
method:
Specificity
Sensitivity
Thoracic fraction
16. Criteria for selecting a suitable
method:
Specificity
Sensitivity
Thoracic fraction
Personal sampling
17. BS ISO 21438-1: 2007
Workplace atmospheres – Determination of
inorganic acids by ion chromatography,
part 1: Non-volatile acids (sulphuric acid and
phosphoric acid)
18. BS ISO 21438-1: 2007
Workplace atmospheres – Determination of
inorganic acids by ion chromatography,
part 1: Non-volatile acids (sulphuric acid and
phosphoric acid)
The method commonly used in the UK
19. BS ISO 21438-1: 2007
Workplace atmospheres – Determination of
inorganic acids by ion chromatography,
part 1: Non-volatile acids (sulphuric acid and
phosphoric acid)
This collects the inhalable fraction
26. BS ISO 21438-1: 2007
Workplace atmospheres – Determination of
inorganic acids by ion chromatography,
part 1: Non-volatile acids (sulphuric acid and
phosphoric acid)
Collects the inhalable
fraction
55. Mike Slater, Diamond Environmental Ltd. (mike@diamondenv.co.uk)
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