夏、秋季杭州湾外海域海水中As、Hg的分布特征及影响因素  

Distribution and influencing factors of As and Hg in summer and autumn off the Hangzhou Bay

作　　者：祝文鑫 徐焕志 毛斌迪 王鑫月 许康 李博 ZHU Wenxin;XU Huanzhi;MAO Bindi;WANG Xinyue;XU Kang;LI Bo(College of Marine Science&Technology,Zhejiang Ocean University,Zhoushan 316000,China;Qingdao Zhuojian Marine Equipment Technology Co.,Ltd.,Qingdao 266555,China)

机构地区：[1]浙江海洋大学海洋科学与技术学院,浙江舟山316000 [2]青岛卓建海洋装备科技有限公司,山东青岛266555

出　　处：《海洋环境科学》2023年第4期566-573,共8页Marine Environmental Science

基　　金：海洋科学浙江省一流学科开放课题(OFMS012);青年科学基金项目(41706022):多种动力过程对长江口外低氧区发生和演变过程的作用机理和影响机制。

摘　　要：杭州湾与长江口直接相邻,水文特征复杂多变,As和Hg是海洋中具有严重危害的两类重金属,因此,探究杭州湾外海域海水中As和Hg的分布特征,对改善海域环境具有重要意义。本研究于2020年夏季(8月)和秋季(11月)对杭州湾外海域海水中As和Hg浓度进行了调查,分析了其污染程度和分布特征,并对影响因素进行了讨论。结果显示,夏、秋季As的浓度范围分别为(0.134~1.728)μg/L和(0.318~1.142)μg/L;Hg的浓度范围分别为(0.021~0.109)μg/L和(0.004~0.040)μg/L。从平面分布来看,近岸海区As和Hg浓度较高,这也说明了陆源输入对近海的影响。As浓度秋季略高于夏季,Hg浓度夏季明显高于秋季,表、底层浓度也表现出一定差异。As和Hg的分布受陆源输入影响,同时还受长江冲淡水、海流、沉积物、悬浮物释放、生物活动、大气沉降以及海水中温度、溶解氧(DO)、pH的影响。The Hangzhou Bay is directly adjacent to the Yangtze River Estuary and changeable hydrological characteristics.As and Hg are two kinds of heavy metals,which are highly toxic to environment and organisms in the ocean.Therefore,it is highly essential to study the distribution of As and Hg in seawater off the Hangzhou Bay,which will be immensely crucial for the enhancement of the marine ecosystem.The concentration of As and Hg in seawater off the Hangzhou Bay were investigated in the summer(August) and autumn(November) of 2020.We analyzed the pollution degree and distribution characteristics,and the influencing factors were discussed.The results showed that the concentrations of As in summer and autumn were in the range of(0.134~1.728) and(0.318~1.142) μg/L,respectively.Correspondingly,the concentrations of Hg were in the range of(0.021~0.109) and(0.004~0.040) μg/L,respectively.In general,the horizontal distribution of As and Hg concentrations were higher in the nearshore sea area,which also indicated the influence of terrestrial input.The concentration of As was slightly higher in autumn as compared to in summer,while Hg was significantly higher in summer than in autumn.There were also concentration differences between the surface and bottom.In addition to terrestrial input,the distribution of As and Hg was also affected by the Changjiang Diluted Water,current,sediments,suspended solids release,biological activities,atmospheric sedimentation as well as temperature,dissolved oxygen(DO),pH in seawater.

关 键 词：杭州湾外海域 AS HG 分布特征 影响因素 

分 类 号：X131[环境科学与工程—环境科学]