Pesticide residues were measured in stockpiled cotton gin trash (CGT) over a 2-year period. Samples were analysed by GC/MS/MS and interpretation of the results was aided by the presence of DDE residues, remnant from prior DDT use. Fourteen pesticide residues from current agricultural practice were detected in CGT. Several of these, including indoxacarb, profenofos, chlorpyrifos, propargite, bifenthrin, ethion and cyhalothrin, were more persistent than expected on the basis of published data for soil dissipation. The results showed a complex pattern of pesticide residue decay over time because of the simultaneous decomposition of the CGT matrix.
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The authors would like to acknowledge the valuable input from Mr. Bruce Pyke, Dr. Vic Edge and financial support from the Cotton Research and Development Corporation, Australia. Residue analyses were conducted at Agrisearch Analytical.
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Crossan, A.N., Kennedy, I.R. Calculation of Pesticide Degradation in Decaying Cotton Gin Trash. Bull Environ Contam Toxicol 81, 355–359 (2008). https://doi.org/10.1007/s00128-008-9414-9
- Cotton gin trash (CGT)