苏州河底泥3种内分泌干扰物的空间分布及环境风险

应用气相色谱质谱联用方法对苏州河及其支流底泥中3种环境内分泌干扰物壬基酚(NP)、辛基酚(4-t-OP)和双酚A(BPA)的含量进行检测和调查,结果表明,这3种物质在河流底泥中的浓度变幅分别为<1.0～5 800、<0.10～39和0.90～180μg.kg-1,空间分异显著.总体上看,底泥污染物浓度与河流周边人为活动密集程度有关:在苏州河上海市区段底泥的含量显著地高于上海远郊和江苏省内河段底泥含量;苏州河支流底泥中的含量显著高于苏州河干流底泥含量.苏州河及其支流底泥中这3种内分泌干扰物两两之间,存在显著正相关,说明其有相似的物源.以含量较高的壬基酚为例,进行底泥环境内分泌干扰物的风险评估,结果表明,除苏州河江苏省内吴家港桥段外,其它河段均存在潜在的生态毒害风险,需采取相应的防范措施.

Spatial Distribution of Three Endocrine Disrupting Chemicals in Sediments of the Suzhou Creek and Their Environmental Risks

Three environmental endocrine disrupting chemicals (EDCs), named nonylphenol (NP), octylphenol (4-t-OP) and bisphenol A (BPA), in sediments of the Suzhou Creek and its branches were detected using gas chromatography-mass spectrometry (GC-MS) method. The results showed that the concentration of three chemicals varied greatly from site to site, which ranged from < 1.0-5 800, < 0.10-39 and 0.90-180 microg x kg(-1), respectively. In general, the accumulation of pollutants in sediments closely related to the intensity of anthropogenic activities: the concentration of three chemicals in sediments of municipal section of the creek are significantly higher than those in the sections of suburb of Shanghai city and Jiangsu province; the chemical concentrations in sediments of branches are significantly higher than those of the main stream of the creek. Significant correlations between each two of the three chemicals in sediments were observed, implying their similar source provenance. Taking nonylphenol as an example, the environmental risks of the EDCs in sediments were assessed. The result indicated that this chemical in the entire creek except the Wujiagang Bridge point had posed potential toxic risks to ecological system. Therefore, more countermeasures should be taken to prevent EDCs from entering the creek.