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Additional resources for Agrochemical Fate and Movement. Perspective and Scale of Study
Special Pub. No. 18. 4420 West Lincoln Way, Ames, IA 50014-3447. Goolsby, D. , Ε. M. Thurman, M. L. Pomes, and Battaglin, W. A. 1993. Temporal and geographic distribution of herbicides in precipitation in the Midwest and Northeast United States, 1990-1991. Proc. Fourth Nat. Conf. On Pesticides. VA Water Resources Research Center, Blacksburg, VA 24060. Wauchope, R. D. The Pesticide Content of Surface Water Draining from Agricultural Fields-Α Review. J. Environ. Qual. 1978, 4, 459-472. Fawcett, R.
The higher concentrations detected in the passive lysimeters in systems A l and A2 are likely due to preferential flow due to no-till (27). The highest cyanazine and atrazine concentrations occurred in samples collected in May 1996 following an application of Extrazine Π at the end of March 1996. These higher concentrations found beneath the no-till plots may not translate into increased groundwater concentrations. The herbicide concentrations in the suction lysimeters samples, which were located beneath the corn rooting zone, were much lower.
These values which are set by US EPA are based upon the toxicity of the individual product. While the methodology to calculate the MCL and HAL is the same, only MCLs are legal drinking water standards. These lifetime MCL and HAL values are based upon the premise that an individual will drink two liters of water every day for 70 years. If they do so, and the water contains a concentration of a particular herbicide at the MCL, no adverse health effect is expected. Comparing HAL and MCL values which are drinking water standards to concentrations in surface water runoff at the edge of field or soil pore water is inappropriate because this water would not or could not be used as a drinking water source.
Agrochemical Fate and Movement. Perspective and Scale of Study by Thomas R. Steinheimer, Lisa J. Ross, Terry D. Spittler