吡唑草胺在土壤中的环境行为研究

为科学评价吡唑草胺的环境风险，参照“化学农药环境安全评价试验准则”，研究了吡唑草胺在土壤中的主要环境行为——光解、挥发、吸附、移动及降解的特性。结果表明：光解、挥发不是吡唑草胺在土表降解的主要因素；吡唑草胺在土壤中具中等移动或可移动特性，难被土壤吸附；吡唑草胺在土壤中的降解受土壤类型以及环境条件（好氧、积水厌氧）的影响，其降解半衰期为4～96 d。由于吡唑草胺在粘土中移动性较强、降解半衰期较长，因此当在该种土壤上使用吡唑草胺时，可能会对地下水、地表水造成污染。

Study on environmental fate of metazachlor in soil

To provide a scientific basis for environmental risk assessment of metazachlor，the environmental fates of metazachlor，including photodegradation，volatilization，absorption，mobility，degradation in soil，were studied according to "Experimental Guideline for Environmental Safety Evaluation of Chemical Pesticides". Results showed that photolysis and volatilization were not important fate of metazachlor on soil surface; metazachlor was moderate to highly mobile in soil and did not adsorb strongly to solid matrices; the half-life of metazachlor in soil varied depending on soil types and environmental conditions （aerobic and anaerobic in water），and was estimated to be 4-96 days. However，metazachlor has the potential to pollute ground and surface water due to its relatively high mobility and long half-life in clay.