Degradation of benomyl, picloram, and dicamba in a conical apparatus by zero-valent iron powder

被引:77
作者
Ghauch, A [1 ]
机构
[1] Univ Savoie, Lab Chem & Environm Engn LCIE, ESIGEC, F-73376 Le Bourget Du Lac, France
关键词
degradation; iron powder; pesticides; reduction;
D O I
10.1016/S0045-6535(00)00184-3
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Reduction of some pesticides (benomyl, picloram, and dicamba) was studied in an aerobic batch conical pilot system to investigate the disappearance of these pesticides on contact with iron powder (20 g/l, 325-mesh). Aqueous buffered solutions of the compounds were added to the system followed by zero-valent iron powder (ZVIP), and the decline in the pesticide concentrations was monitored over time. HPLC analyses show a complete disappearance of picloram (1.20 mg/l) after 20 min of reaction. Benomyl (1.00 mg/l) and dicamba (1.25 mg/l) disappear after 25 and 40 min, respectively. The t(50) values ranged From 3 to 5.5 min, and were about slightly less than the t(1/2) values reported when the log of the relative HPLC peak area was plotted versus time, where the relative peak area was calculated by dividing the measured peak area by the initial peak area. Pathways for the degradation of the studied pesticides by ZVIP are proposed. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1109 / 1117
页数:9
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