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2011年4月通过GC定量检测和210Pb测年对灌河口海域表层和柱状沉积物中OCPs(Organochlorine Pesticides)的空间分布、来源解析进行了研究。结果表明:灌河口海域表层沉积物中OCPs的浓度在nd~58.3×10-9(干重)之间,河口海域O,P’-DDT浓度明显高于潮间带和入海河段,3个区域浓度排序为:潮间带>河口海域>入海河段。DDTs和HCHs浓度均处于国内中等水平。柱状沉积物中OCPs浓度在(2.0~850.0)×10-9之间、平均值210.0×10-9,90年代初期OCPs浓度有所下降,2000年后又在波动中升高。来源解析及柱状样中OCPs浓度变化、转化情况均表明该海域沉积物有新的DDTs源输入。参照加拿大颁布的沉积物质量标准对灌河口沉积物进行风险评估,结果表明灌河口海域以DDT和DDD为主的毒性已处于频繁效应,需深入开展沉积物的环境风险评估研究,确认开展OCPs底质修复方案及区域。
In April 2011, the spatial distribution and origin analysis of OCPs (Organochlorine Pesticides) in the surface and columnar sediments of the irrigation estuary were studied by GC quantitative detection and 210Pb dating. The results showed that the concentrations of OCPs in surface sediments of Guanhe Estuary ranged from nd to 58.3 × 10-9 (dry weight), and the concentrations of O, P’-DDT in estuaries were significantly higher than those in intertidal and inland sections. Three The regional concentrations are as follows: intertidal zone> estuarine zone> entering the sea reach. DDTs and HCHs concentrations are in the medium level. The concentrations of OCPs in columnar sediments ranged from (2.0 to 850.0) × 10-9 with an average of 210.0 × 10-9. OCPs concentrations decreased in the early 1990s and increased again after 2000. Source analysis and changes in the concentration of OCPs in column samples, both of which indicate that there is a new source of DDTs in the sediments of the sea area. The risk assessment of sediments in the estuarine waters by reference to the Canadian sediment quality standards showed that the DDT and DDD-dominated toxicities in the estuarine watershed were already under frequent effects. Further studies on the environmental risk assessment of sediments should be carried out to confirm that the bottom of OCPs Quality repair programs and regions.