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大亚湾表层沉积物中重金属分布特征
吕彦儒,袁蕾,倪志鑫,林红梅
0
(国家海洋局南海环境监测中心,广东 广州 510300;自然资源部第三海洋研究所,福建 厦门 361005)
摘要:
为了解大亚湾沉积物中重金属分布及污染状况,于2016年8月对大亚湾海域表层沉积物中重金属元素(As、Cd、Cr、Pb、Zn和Cu)展开调查,并将获得的各元素含量与粒度、Fe、Mn和总有机碳(TOC)等相关理化要素进行相关性分析。结果表明:大亚湾沉积物中重金属受陆源输入影响较大,含量基本呈现为沿岸高、湾内低的趋势,总体质量较好,基本符合第一类海洋沉积物质量标准要求;澳头湾和范和港附近海域人类活动密集,重金属含量较高。通过相关性分析结果发现,大亚湾重金属主要来源为岩石的风化和侵蚀、工业污水排放和渔业养殖等;Cu与铁锰氧化物结合性弱于其他元素,在还原性环境中被沉积物吸附形成金属Cu硫化物可能是喜洲岛附近海域Cu元素含量异常高值的原因;作为湾内有机质主要来源的水生浮游生物的生长状态对Cr、Zn和Pb含量影响较大;Cr、As和Pb与粉砂结合为主,Zn与粘土结合为主。
关键词:  海洋化学  重金属  沉积物  相关性分析  大亚湾
DOI:10.3969/J.ISSN.2095-4972.2021.04.011
基金项目:国家海洋局南海分局海洋科学技术局长基金资助项目(1617);自然资源部第三海洋研究所基本科研业务费专项资金资助项目(海三科2013023);人社部留学回国创业启动支持计划资助项目(2017-43);自然资源部生物活性物质重点实验室开放基金资助项目(MBSMAT-2015-03)
Distribution of heavy metals in surface sediments of Daya Bay
Lv Yanru,YUAN Lei,NI Zhixin,LIN Hongmei
(South China Sea Environmental Monitoring Center, SOA, Guangzhou 510300, China;Third Institute of Oceanography, MNR, Xiamen 361005, China)
Abstract:
In order to understand the distribution and pollution situation of heavy metals in the sediments of Daya Bay, the concentrations of As, Cd, Cr, Pb, Zn and Cu in the surface layer of sediments in Daya Bay were investigated in August 2016. Correlation analysis was carried out between heavy metal contents and the physical and chemical parameters of the sediments, such as grain size, contents of Mn, Fe and TOC. Results indicated that distributions of heavy metals in the sediments basically had a pattern of lower concentrations in the Bay central than the coastal, which indicated that terrigenous input was a main source. Moreover, due to intensive human activities, higher concentrations of heavy metals were found near Aotou Bay and Fanhe Port. Overall, most of heavy metals in the surface sediments of Daya Bay meet the first class of the national standard of marine sediment quality. characterizing a low risk level of heavy metal pollution. The results of correlation analysis showed that heavy metals in surface sediments of Daya Bay were rather influenced by the weathering and erosion of rocks, industrial sewage discharge and marine aquaculture. The binding of Cu and oxide of Fe and Mn is weaker than other form of bindings. Thus, metallic copper sulfide may be formed after Cu being adsorbed by sediments in reducing environment, which is why much higher content of Cu observed near Xizhou Island. Plankton growths, as the main source of organic matter in the Bay, had great influence on the contents of Cr, Zn and Pb in the sediments. Besides, Cr, As and Pb were mainly combined with silt while Zn was mainly combined with clay.
Key words:  marine chemistry  heavy metal  sediments  correlation analysis  Daya Bay

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