浙江三门湾表层沉积物重金属含量分布、赋存形态及生态风险评价  

Distribution,speciation and ecological risk assessment of heavymetals in the surface sediments of Sanmen Bayin Zhejiang

作　　者：赵晨辉 胡佶[1,2] 刘小涯[1,2] 陈文深[1,2] 蔡小霞 张海峰 于培松[1,2] 潘建明[1,2] 张海生[1,2] ZHAO Chen-hui;HU Ji;LIU Xiao-ya;CHEN Wen-shen;CAI Xiao-xia;ZHANG Hai-feng;YU Pei-song;PAN Jian-ming;ZHANG Hai-sheng(Laboratory of Marine Ecosystem and Biogeochemistry,SOA,Hangzhou,310012,China;Second Institute of Oceanography,SOA,Hangzhou,310012,China)

机构地区：[1]国家海洋局海洋生态系统与生物地球化学重点实验室,浙江杭州310012 [2]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《海洋学研究》2018年第2期64-73,共10页Journal of Marine Sciences

基　　金：国家自然科学基金青年基金项目资助(21307019;41306112);国家海洋公益性行业科研专项项目资助(201505034);浙江省自然科学基金项目资助(LY14D060007);国家海洋局第二海洋研究所中央财政科研项目资助(JG1322)

摘　　要：以三门湾表层沉积物为研究对象,对5种重金属(Zn、Cr、Cd、Cu、Pb)的含量分布、赋存形态进行分析,并运用潜在生态危害指数法、Risk Assessment Code(RAC)法、次生相与原生相比值法对重金属生态风险进行了评价。结果表明:三门湾表层沉积物重金属的含量分布整体表现为湾内高于湾外海域,人类活动是主要影响因素。运用BCR法对沉积物中重金属进行分级提取,结果显示Zn、Cd、Cr、Cu均以残渣态为主要赋存形态(Zn:79.20%~84.25%、Cr:93.24%~96.16%、Cd:34.71%~57.58%、Cu:66.06%~79.51%),而Pb以可还原态为主(56.58%~76.44%)。评价结果中,潜在生态危害指数法和次生相与原生相比值法均显示湾内的重金属污染比湾外严重,而RAC法指出Pb污染为湾外高于湾内海域;潜在生态危害指数法和RAC均指出Cd是主要污染元素;在次生相与原生相比值法中Pb则是主要危害元素,Cd次之。Surface sediment samples were collected from Sanmen Bay in Zhejiang Province.The distribution of total concentration of five heavy metals（Zinc,Chromium,Cadmium,Copper,and Lead）was determined,and their speciation was investigated using BCR extraction method.The pollution level and ecological hazard of these heavy metals were evaluated with three methods：Potential Ecological Risk Index（Eir）,Risk Assessment Code（RAC）,Ratio of Secondary and Primary Phase（RSP）.The distribution of five metals show that the total concentrations in inner bay are higher than those out of the bay.The results of metal speciation in surface sediment show that the residual fraction of four metals are predominated except for Pb,of which Zn accounts for 79.20%~84.25%,Cr accounts for 93.24%~96.16%,Cd accounts for 34.71%~57.58%,and Cu accounts for 66.06% ~79.51%,respectively.The dominated fraction of Pb is the part bounded to amorphous Fe and Mn oxides and hydroxides,which accounts for 56.58%~76.44%.The evaluation results indicate that Cd is the primary element in the area according to Potential Ecological Risk Index,and which is consistent with that by the Risk Assessment Code method.However,Pb is evaluated to be the primary element with potential ecological threat according to the Ratio of Secondary and Primary Phase,and followed by Cd.

关 键 词：三门湾 重金属 赋存形态 BCR提取法 生态风险评价 

分 类 号：P736.4[天文地球—海洋地质] X826[天文地球—海洋科学]