Effects of Humic Materials on Transport and Bio Degradation of Pesticides in Environment

为了研究腐植酸对农药在土壤和水环境中迁移的影响，用腐植酸和黄腐酸吸附的DEAE法考察了腐植酸对农药的吸附，比较了腐植酸和黄腐酸对水溶性较高的杀虫剂苯硫酮的吸附效果。报道了吸附分配系数。结果表明，腐植酸是一种比黄腐酸更有效的吸附剂。考察了腐植酸对MEP生物降解性的影响。MEP在培养基中被类假单胞菌降解。腐植酸对葡萄糖的消耗速率有影响，而MEP分解葡萄糖的速率不受腐植酸的影响。

In order to consider the effects of humic materials on transport of pesticide in soil and water environment, the adsorption of pesticide by humic materials was examined, By using the DEAE by which adsorbed humic acid or fulvic acid, the adsorption of Phenitrothione (MEP), one of an insecticide having rather high water solubility, by humic acids and fulvic acid was compared. Partition coefficients of adsorption were reported. Results indicated that humic acid was a more effective adsorbent than fulvic acid. The effect of humic acid on the biodegradation of MEP was examined too. MEP was decomposed by a Pseudomonas like bacterium in a culture medium. The rate of glucose consuming was affected by humic acid, however the rate of MEP decomposition with glucose consuming was not affected by humic acid.