山东省寿光市土壤中有机氯农药残留分布及来源解析

寿光市土壤中六六六(HCHs)和滴滴涕(DDTs)均有残留。六六六(HCHs)检出率为27.64%,主要残留物为γ-HCH和δ-HCH,平均残留率分别为0.65×10~(-9)和0.50×10~(-9);滴滴涕(DDTs)检出率为59.35%,主要残留物为p,p′-DDE和p,p′-DDT,平均残留率分别为5.21×10~(-9),5.20×10~(-9)。残留量较国内多数其他地区低,仅DDTs稍高于香港土壤和黄淮海地区农田。按土壤环境质量评价标准,HCHs属于一类土壤,DDTs一类土壤占比90.41%,二类土壤占比9.56%。通过对HCHs和DDTs各组分残留量进行比较,寿光市HCHs和DDTs使用时间较久远,多数已降解,但仍有部分地区可能使用过林丹,部分地区有新外源DDTs污染输入。

Residue Distribution and Source Analysis of Organochlorine Pesticides in Soil in Shouguang City of Shandong Province

there are residues of HCHs and DDTs in the soil in Shouguang city. The HCHs detection rate is 27.64%, main residues are HCH and HCH, and average residual rate is 0.65 ×109 and 0.50 ×109respectively. DDTs detection rate is 59.35%, main residues are p,p ''dde and p,p''ddt, and the mean residual rate is 5.21×109 and 5.20×109 respectively. The residual amount is lower than in most other areas. Only DDTs is slightly higher than the soil in Hongkong and farmland in Huanghuaihai area. According to the soil environmental quality evaluation standard, HCHs belongs to a class of soil, and the soil proportion of DDTs is 90.41%, and the second class soil is 9.56%. Components of HCHs and DDTs residues, shouguang HCHs and DDTs use for a long time, most has the degradation, but there are still parts may be used Lin, parts of the new foreign DDTs contaminated input.