山东烟台市土壤中有机氯农药的残留及来源研究

烟台市表层土壤中DDTs(滴滴涕)、HCHs(六六六)有不同程度的检出,DDTs检出率34.59%,p,p′-DDE是主要残留物;HCHs检出率2%,δ-HCH含量最高。总体而言,HCHs残留量低于其它一些国家或地区,而DDTs残留量偏高。通过对α-HCH/γ-HCH、p,p′-DDD/p,p′-DDE和(p,p′-DDE+p,p′-DDD)/p,p′-DDT比值变化特征的研究,表明烟台市土地利用较多处于好氧环境中,大部分地段HCHs、DDTs农药使用时间较长,但局部土壤可能存在DDTs新的污染源,并对土壤质量产生较大影响,个别采样点有林丹被使用的可能性。分析认为,烟台市土壤中HCHs风险较低,但局部土壤DDTs仍有一定风险。

Research on Residues and Sources of Organochlorine Pesticides in Soil of Yantai,Shandong Province

Surface soil in Yantai City was detected when loaded with DDTs and HCHs at different levels,the detection rates of DDTs and HCHs are 34.59% and 2%,respectively;major residues are p,p’-DDT and -HCH,respectively.Generally,the residual contents of HCHs in the study area are lower than those in other countries or cities,whereas the residual contents of DDTs are relatively high.Variations in α-HCH/γ-HCH,p,p′-DDD /p,p′-DDE and(p,p′- DDE + p,p′-DDD) / ′p,p′-DDT values indicate that much of soil in Yantai City is developed within an aerobic environment,HCHs and DDTs are applied in most places for a long period of time,DDTs may have a new pollution source and impose a great impact on current soil environment quality.However,residual HCHs are low,but there still is the possibility of local use of ’Linden’(a Chinese OCPs brand).The study suggested that the HCHs of soil in Yantai City are in a state of low danger,whereas DDTs still display risks locally in some places.