珠江三角洲城市群及高海拔地区表层土中有机氯农药的空间分布特征

摘要

利用GC-ECD方法测定了珠江三角洲城市群及高海拔地区表层土壤中的有机氯农药.有机氯农药变幅为2.4～78.7 ng/g,平均15.9 ng/g.最高值出现在江门.总HCHs变幅为ND～19.2 ng/g,平均2.91 ng/g,最高值出现在佛山.总DDTs变幅为ND～74.6 ng/g,平均值为9.91 ng/g.最高值出现在东莞.六氯苯在佛山较高.灭蚁灵在深圳的污染较其它地区严重.总体来说,HCHs污染程度较低,但部分地区有林丹的使用；有些采样点DDTs的污染程度超过了国家土壤环境质量标准的一级自然背景值,且有些区域可能有非三氯杀螨醇的DDTs外源输入.%Samples of surface soils from urban and high elevation areas in Pearl River Delta were analyzed for organochlorine pesticides (OCPs) using GC-ECD method.The total OCPs concentrations were in the range of 2.4-78.7 ng/g dry weight (dw),averaging 15.9 ng/g dw with the maximum value occurred at Jiaagmen.The total HCHs concentrations were in the rage of ND19.2 ng/g dw,averaging 2.91 ng/g dw,with the maximum occurred at Foshan.The total DDTs concentrations were in the rage of ND-74.6 ng/g,averaging 9.91 ng/g dw,with the maximum values occurred at Dongguan.HCB concentration maximum occurred at Foshan and the highest mirex pollution cites werein Shenzhen.In general,HCHs pollution was low,but there were the use of lindane in some areas.In some cites,the DDTs pollution Exceeded the national soil environmental quality standard value of the natural background,and maybe there were some non-dicofol DDTs sources in some places.