02070naa a2200289 a 450000100080000000500110000800800410001910000190006024500940007926000090017352011950018265000160137765000250139365000150141865000170143365000260145065000110147665000240148765000090151165000130152065300110153365300270154465300160157170000200158770000200160777301530162710159732014-03-28       2007    bl uuuu     u00u1 u    #d1 aMARTINS, E. L.  aLeaching of seven pesticides currently used in cotton crop in Mato Grosso State - Brazil.  c2007  aThis study aimed to evaluate the leaching of pesticides and the applicability of the Attenuation Factor (AF) Model to predict their leaching. The leaching of carbofuran, carbendazim, diuron, metolachlor, agr and b.beta endosulfan and chlorpyrifos was studied in an Oxisol using a field experiment lysimeter located in Dom Aquino - Mato Grosso. The samples of percolated water were collected by rain event and analyzed. Chemical and physical soil attributes were determined before pesticide application to the plots. The results showed that carbofuran was the pesticide that presented a higher leaching rate in the studied soil, so was the one representing the highest contamination potential. From the total carbofuran applied in the soil surface, around 6 % leached below 50 cm. The other pesticides showed lower mobility in the studied soil. The calculated values to AF were 7.06E-12 (carbendazim), 5.08E-03 (carbofuran), 3.12E-17 (diuron), 6.66E-345 (agr-endosulfan), 1.47E-162 (b.beta-endosulfan), 1.50E-06 (metolachlor), 3.51E-155 (chlorpyrifos). AF Model was useful to classify the pesticides\\\\\\\' potential for contamination; however, that model underestimated pesticide leaching.  aAgrotóxico  aÁguas Subterrâneas  aLisímetro  aLixiviação  aModelo de Simulação  aOxisol  aPoluição da Água  aSolo  aSorção  aBrasil  aContaminação do solo  aMato Grosso1 aWEBER, O. L. S.1 aSPADOTTO, C. A.  tJournal of Environmental Science and Health. Part B. Pesticides, Food Contaminants and Agricultural Wastes, New Yrokgv. 42, n. 8, p. 877-882, 2007.