珠江口黄茅海表层海水和沉积物中重金属的分布及评价

根据2014年4月对珠江口黄茅海海域表层海水和沉积物中重金属分布的调查监测,采用单因子指数法、内梅罗指数法和生态危害指数法对其重金属污染水平进行评价。结果显示:该海域表层海水中部分站位的Pb、Cu、Zn和Hg超出第一类海水水质标准,内梅罗指数评价表明其整体处于轻污染水平。表层沉积物中部分站位的Hg、As和Cu超出第一类海洋沉积物质量标准,内梅罗指数评价表明其整体处于重污染水平,生态危害指数评价表明其整体可能面临中度风险,Hg为主要风险因子。表层海水中Pb、Cu、Zn具有同源性,表层沉积物中Pb、As、Zn和Cu具有同源性。

Distribution and Evaluation of Heavy Metals in Surface Seawaters and Sediments in Huangmao Sea of the Pearl River Estuary

Distribution of heavy metals in surface seawaters and sediments in Huangmao sea of the Pearl River Estuary was studied based on the survey data on April 2014. The status and ecological hazards of these elements were evaluated by single factor index, Nemerow index and potential ecological risk index. The results showed that the concentrations of Pb, Cu, Zn and Hg in surface waters of some sampling stations exceeded the national standard of first grade seawater quality. Nemerow index showed that the surface seawaters were in slight pollution level as a whole. The concentrations of Hg, As and Cu in surface sediments of some stations exceeded the national standard of first grade sediment quality. Nemerow index showed that the surface sediments were in severe pollution level as a whole. Potential ecological risk index showed that the surface sediments would be faced with a moderate risk of heavy metal. The main risk factor was Hg. Pb, Cu and Zn in the surface seawaters were homologous and Pb, As, Zn and Cu in the surface sediments were homologous.