乙草胺、铜污染共存对土壤甲胺磷蚯蚓降解过程的影响研究

为揭示利用蚯蚓活动强化甲胺磷降解的可行性,采用了微宇宙培养方法,通过有蚯蚓和无蚯蚓的对比实验,考察了乙草胺和铜分别与甲胺磷共存条件下污染黑土中甲胺磷降解过程的动态变化.结果表明,无论是否加入蚯蚓,甲胺磷单一污染的土壤中甲胺磷的降解符合一级反应动力学规律;蚯蚓活动能促进甲胺磷降解过程的进行.土壤中乙草胺或铜与甲胺磷共存时,均明显地干扰了甲胺磷降解过程随时间的动态变化;根据化学结构分析,推测两者对甲胺磷降解规律的影响机制可能类似.铜与甲胺磷复合污染的土壤中甲胺磷含量明显高于乙草胺与甲胺磷复合组,说明铜较乙草胺对土壤甲胺磷降解过程的延缓作用更强.

Influences of acetochlor and copper on the degradation process of methamidophos in phaeozem by earthworms

In order to reveal the degradation-intensifying feasibility of methamidophos by earthworm activities, dynamic changes in the degradation of methamidophos by earthworms in phaeozem under the coexistence of aeetochlor or copper was investigated, and compared with those without earthworm aetivities, using the microcosm culture method. The results showed that changes in the degradation of methamidophos in phaeozem with time complied with the rule of first-order reaction kinetics Whether there were earthworms or not. The activity of earthworms can accelerate the degradation of methamidophos in soil. The coexitence of acetochlor or copper and methamidophos evidently disturbed the changes in the degradation of methamidophos with time. According to the chemical structure of the pollutants, it can be deduced that aeetoehlor and copper might perhaps affect the process of methamidophos degredation based on the similar interferential mechanism. The concentration of methamidophos coexisting with copper was obviously higher than with aeetoehlor. This implies that copper can defer the degradation of methamldophos more than aeetonblor.