2. Background Information
Objective
Hypothesis
Methodology
Results
Discussion
Future Work
References
3. Nitrate:
Composition of one nitrogen atom and three oxygen
atoms
Soluble in water at standard temperature and pressure
http://www.chemistry.wustl.edu
/~courses/genchem/Tutorials/Io http://sci.waikato.ac.nz/farm/images/a
ns/images/nitrate3.jpg tomic%20structure%20of%20nitrate.p
ng
4. Nitrates are important for plants and algae to grow
Fertilizers
High levels of nitrate can cause:
Methemoglobinemia-Blue baby (Austin, 1999)
Cancer
5. The nitrate levels will rise after a precipitation event in
studied water bodies.
6. Measure the levels of nitrates in water bodies after an
extreme precipitation event.
14. Lake Sample
Before precipitation:
from 4/28/2012am to
4/30/2012 am
vs.
After precipitation: from
4/30/2012pm to
5/2/2012pm
15. River Sample
Before precipitation:
from 4/28/2012 am to
4/30/2012 am
vs.
After precipitation: from
4/30/2012 pm to
5/2/2012 pm
16. Lake Water River Water
Concentration of nitrates Concentration of nitrates
0.079-0.469 0.211-0.791
Nitrate level increased Nitrates levels increased
after precipitation event after precipitation event
Nitrate level increased in Nitrate level increased in
5/1/2012 pm 4/30/2012 pm
17. Precipitation can be a factor in the levels of nitrates.
Possible factors that affected our results:
Periods between samples
Storage of the samples
Agricultural and rural areas
Artificial lake
18. Compare extreme dry periods vs. extreme
precipitation event.
Collect more samples for a longer period of time.
Collect from the same water body, but on different
sites.
19. Dr. Javier Arce
Ruby Otero
RISE Program
Dr. EneidaDíaz
Dr. Elena González
Dr. Roberto Ross
20. Hach Company. 2007. Nitrate. Revised 2010. Doc
316.53.01070. (p) 1-6
Kreitler C, Jones D. 1975. Natural Soil Nitrate: The Cause of
Nitrate Contamination of Ground Water in Runnels
County, Texas. 13 (1)
Self JR, Waskom RM. July 1995. Nitrates in Drinking Water.
Revised October 2008. Fact Sheet No. 0.517
21. Austin A. 1999. Infantile Methehemoglobinemia:
Reexamining the Role of Drinking Water Nitrates.
Environmental Health Perspectives [Internet]; [Published
1999 June 1]. Volume(107):[approximately 4 p.]. Available
on
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1566680/?
page=1
22. United States Geological Survey
http://waterdata.usgs.gov/pr/nwis/uv/?dd_cd=01_00065
&format=img_default&site_no=50055225&set_arithscale
_y=on&begin_date=20120425&end_date=20120502
http://waterdata.usgs.gov/pr/nwis/uv/?dd_cd=03_0004
5&format=img_default&site_no=50055225&set_arithscal
e_y=on&begin_date=20120425&end_date=20120502
Notas do Editor
Impotance: for plants as it is a source of nitrogen which forms the building blocks of molecules such as amino acids and DNA.
A form of hemoglobin that doesn’t carry oxygen through out the body called methemoglobin. N-nitroso compound found in the gastric juices on the stomach
Describiralrededores, como se cogieronlasmuestras…
Dimethylphenol method: TNT 835 – Sulfuric and phosphoric acid Solution A – isopropanol
Diferenciasignificativa p<0.001 t-test
Unted States Geological Survey Rain gauge: gather and measure the amount of liquid precipitation over a set period of time.
Nitrates are more concentrated below or near the area of waste accumulation or disposal such as manure piles, feedlots, septic tank disposal fields, cesspools, privies, etc. Excess nitrates also are more apt to be found in ground water under low areas and waterways that collect or conveyFactors that maybe affected our results may have been the temperature because Nitrate levels generally are highest following wet periods and lowest, even down to zero nitrates, during dry periods which may cause a false sense of security.Nitrate levels may have decrease because If nitrate levels drop it can mean two things. One possibility is that the bacteria that break down either ammonia or nitrite have been killed off.
