Abstract
BACKGROUND: This study was performed to investigate the change of deltamethrin residue after spraying for control of hygienic insects in bush of levee at Bansuk-dong stream (A) and Juk-dong ditch (B) in Yuseong, Daejeon. The drop concentrations and disappearance of deltamethrin residue in stream water were determined to evaluate the toxic effects of stream ecosystem. METHODS AND RESULTS: Water samples were collected at 7 points including 0, 5, 10, 20, 40, 70 and 100 m downstream from the deltamethrin spraying point. Water sample was partitioned into dichloromethane, and was determined with GC/-ECD. Limit of Quantitation of deltamethrin was 0.04 . Recoveries of deltamethrin at two fortification levels of 0.4 and 2.0 were (n=3) and (n=3) in A stream, and (n=3) and (n=3) in B stream, respectively. Residue of A stream were from to 0.48 and B stream were from 0.08 to 14.95 under practice application condition. And residues were from to 0.2 in A stream treated deltamethrin with 1.0 mg level at the upper region. CONCLUSION(S): Practice application of deltamethrin for the pest control of waterside was not much shown toxic effect to ecosystem of stream.
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