农田土壤滴滴涕 (DDTs )残留量调查与评价

Investigation and Evaluation of Residual Amount ofDDTs in Farml and Soil

研究选取池州市近郊旱地、水田、菜地3种土地利用方式,分析滴滴涕(DDTs)四种衍生物在土壤中残留量的变化。结果表明:各土地利用方式土壤中滴滴涕(DDTs)各衍生物的含量较低。在土壤样本中,DDTs的残留物主要有P,P-DDE和P,P-DDT两种。水田有4个土壤样品的P,P-DDD/P,P-DDE质量比大于1,由此推断池州市郊区水田在水稻种植期主要处于厌氧环境中。(DDE+DDD)/DDT比值在0.45~2.47之间,其中有3个样品的比值在1以下,说明使用DDTs杀虫剂的时间较短,应探究其原因,进一步调查分析。

Three kinds of land use methods were selected:dry land,paddy field and vegetable field in the suburbs of Chizhou city,and the residual variation of the four kinds of derivatives of DDTs in the soil was analyzed.The results showed that the content of DDTs was low.In the soil samples,P,P′-DDE and P,P′-DDT were the main residues of DDTs.There were four soil samples of P,P-DDD and P,P-DDE mass ratio was greater than 1,so it was inferred that the paddy fields in the suburbs of Chizhou city were mainly in an anaerobic environment during the rice planting period.The ratio(DDE+DDD)/DDT was between 0.45 and 2.47,and the ratio of three samples was less than 1,indicating that DDTs pesticide application time was short and should be paid to further investigate and analyze the causes.