Dissipation and movement of acaricide chlorobenzilate in the environment.
The dissipation of acaricide chlorobenzilate in selected soil and river water samples was studied. Under incubation conditions at 25 degrees C and 90% field capacity of moisture for 21 days, the residues of chlorobenzilate were 14 and 55% in Lukang silty clay loam and Pincheng clay, respectively. More than 80% of chlorobenzilate remained in the natural water (pH 7.2 and 7.3, respectively) and in the water adjusted to pH 5.0 when water samples collected from Green Lake and Wai-Shuang River near Taipei were treated with chlorobenzilate and then incubated for 34 days. But when the pH was adjusted to 9.0, only 60% was found in Green Lake water and 29% in Wai-Shuang River water. The dissipation of chlorobenzilate in the soil was fitted to first-order kinetics with half-lives of 5 to 36 days under various conditions in the laboratory experiments. No chlorobenzilate was detected in the leachate by a leaching experiment on the soil column for 18 days; most chlorobenzilate remained in the upper 3 cm of the column. According to assessment by the groundwater pollution-potential model (GWP), chlorobenzilate seemed to be safe in regard to groundwater contamination.
Wang
Y S
YS
Department of Agricultural Chemistry, National Taiwan University, Taipei, Republic of China.
Chen
S W
SW
Yen
J H
JH
Chen
Y L
YL
D001561:Benzilates / Q000737:chemistry*; D002849:Chromatography, Gas; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry*; D007700:Kinetics; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D013624:Taiwan; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
D001561:Benzilates; D007306:Insecticides; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C004659:chlorobenzilate