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PERSISTENCE AND DISTRIBUTION OF AZINPHOS-METHYL FOLLOWING APPLICATION TO LITTORAL ENCLOSURE MESOCOSMS
Citation:
Knuth, M L., L J. Heinis, AND L E. Anderson. PERSISTENCE AND DISTRIBUTION OF AZINPHOS-METHYL FOLLOWING APPLICATION TO LITTORAL ENCLOSURE MESOCOSMS. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 47:166-177, (2000).
Description:
The organophosphorus insecticide azinphos-methyl was applied once to the surface of 12 of 18 littoral enclosure mesocosms (5 x 10m) constructed in a 2-ha pond near Duluth, Minnesota. Water, sediment, macrophytes, and adult fathead minnows were analyzed for residue to determine the persistence, distribution, and mass balance of azinphos-methyl. Nominal treatment concentrations were 0, 0.2, 1, 4, and 20 ug/liter active ingredient. The maximum residue concentration in the water was measured 1 h after treatment. The half-life in the water column ranged from 1.2 to 2 days and 95% of the residue dissipated in 5.4 to 10.2 days. Measureable residues in these media were measured at 4, 1, and 0.12 days respectively. The water and sediment were the most important sorptive components for azinphos-methyl residue. The macrophytes and fish were of minor importance, containing only trace amounts of the mass applied.