长江口南岸水体SPM和表层沉积物中OCPs的赋存

Occurrence of organochlorine pesticides (OCPs) in suspended particle matters (SPMs) and surface sediments of the south bank of the Yangtze estuary

利用GC-ECD对长江口南岸14个采样点水体悬浮颗粒物(SPM)及表层沉积物进行了有机氯农药(OCPs)的测定,分析了其中HCHs和DDTs的赋存水平和形态分布.研究表明,OCPs的含量水平有DDTs>HCHs的趋势;悬浮物中污染物浓度高于表层沉积物.悬浮物中HCHs污染水平分布在6.24～14.75ng/g,平均值为12.27ng/g; DDTs的污染水平为3.36～25.66ng/g,平均值为16.37ng/g.而表层沉积物中HCHs含量为1.19～8.22ng/g,平均值5.92ng/g; DDTs的含量水平为4.96～14.94ng/g,平均值为8.92ng/g.研究区内OCPs的含量低于ER-M值,对环境生物具有潜在的危害性.

Organochlorine pesticides in 14 samples in suspended particle matters and surface sediments of the south bank of the Yangtze estuary were determined by GC-ECD, and the concentration levels and distribution of HCHs and DDTs were analyzed in detail. The content levels of OCPs tended to be DDTs〉HCHs, and characterized by higher concentration levels in SPMs and lower in surface sediments. The distribution of HCHs in SPMs ranged from 6.24 to 14.75ng/g, with an average value of 12.27ng/g and 3.36-25.66ng/g in concentration level for DDTs , with a mean value 16.37ng/g; the contents of HCHs varied from 1.19 to 8.22ng/g in the surface sediments, with an average of 5.92ng/g; the content level of DDTs was 4.96-14.94ng/g with an average of 8.92ng/g. The contents of OCPs in the study area were lower than the ERM value with potential harm on the environmental organisms.