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Transcript of Atrazine Presentation
expensive and not required
If issues, new systems MCLs are set by the EPA to regulate amounts in water sources. These have been set to 3ppb.
The vast majority of areas meet these levels, with only few exceptions in wells around agricultural lands. HALs and Exposure Rate evaluation: HAls are set to levels based on lifetime exposure.
This exposure level is considered safe due to the current assumed carinoginic levels and estimated exposures Water: Testing is done prior to filtration.
Due to the lack of steps that would remove Atrazine, the levels are relatively the same. Co-occurance
Most assessments of atrazine in surface water do not consider its joint toxicity with other chemicals with which it is commonly found, and therefore may be neglecting the effects of potential additive and synergistic reactions on aquatic organisms. Current Research
There is inadequate understanding of the mode of toxic action of for or among interacting chemicals, thus posing the problem of modeling pesticide mixtures involving primary and secondary toxicants Methods of Assessment
Concentration addition (CA) and independent action (IA), derived from response curve examinations, are the two most widely used methods
CA (or similar joint action) is the preferred method for assessing chemicals with the same mode of action, as it measures the concentration-response function of single compounds 
Independent action, also called response addition, is applicable for mixtures consisting of components with dissimilar modes of action. This model compares every toxicant in the mixture’s contribution to a common response. Results of a study addressing the acute and chronic toxicity of pesticide formulations of atrazine on juvenile Lampsilis siliquoidea revealed that the atrazine formulation (Aetrex) was more toxic than atrazine alone in chronic tests. Whereas, for the other pesticides analyzed in the study, acute and chronic toxicity of pesticide formulations and the technical-grade pesticides were similar. Preston Seth Watkins Exposure MCLs HALs Removal Thomas Moore Movement of Atrazine Atrazine (in product) Water Fertilizer
Other Herbicides about 76.5 million lbs/yr Taken up by roots Applied in moist soils soon after larger rain evens Additional rain likely to cause runoff Average atrazine runoff- about 1.5% of total applied
Of 76.5 million lbs applied- about 115 thousand moves into surface waters Small percentage makes it into water bodies
Concentrations in drinking water are below EPA standards
Human contact with atrazine may be overestimated
More studies need to be done on atrazine's joint toxicity Works Cited
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