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.
Course 4997 Final Presentation
Lysander Borrero Eduardo Rivera MBRS-RISE UPR at Cayey Dr. Javier Arce
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
Nitrates are important for plants and algae to grow Fertilizers High levels of nitrate can cause: Methemoglobinemia-Blue baby (Austin, 1999) Cancer
The nitrate levels will rise after a precipitation event in studied water bodies.
Measure the levels of nitrates in water bodies after an extreme precipitation event.
Lake Sample Before precipitation: from 4/28/2012am to 4/30/2012 am vs. After precipitation: from 4/30/2012pm to 5/2/2012pm
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
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
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
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.
Dr. Javier Arce Ruby Otero RISE Program Dr. EneidaDíaz Dr. Elena González Dr. Roberto Ross
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
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
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