南海北部海域表层沉积物重金属含量分布及来源  

Spatial patter and provenance of heavy metal elements in the surface sediments in the northern South China Sea shelf

作　　者：王喻鸣 王玉琨 陈晓宏 WANG Yuming;WANG Yukun;CHEN Xiaohong(School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;Guangdong Provincial Key Lab of Geodynamics and Geohazards,Zhuhai 519082,China)

机构地区：[1]中山大学土木工程学院,广东珠海519082 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]广东省地球动力作用与地质灾害重点实验室,广东珠海519082

出　　处：《中山大学学报（自然科学版）（中英文）》2022年第1期139-150,共12页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金广东联合基金重点项目(U1911204);广东省引进人才创新创业团队(2016ZT06N331)。

摘　　要：南海北部陆架海域的表层沉积物记录了重金属元素来源及其污染状况的重要信息,可以反映区域生态风险状况,明确其重金属元素含量的空间分布、来源及其与人类活动的关联对理解本区域重金属的生态环境效应具有重要意义。对2016年夏季航次在南海北部陆架海域27个站点采集表层沉积物,开展较系统的沉积物粒度及重金属含量特征研究。结果表明:沉积物以砂、粉砂、砂质淤泥为特征,颗粒粒径变化介于0.77~6.28Φ,平均3.43Φ;其Cu、Zn、As、Cd、Pb和V含量均超平均上地壳值,在漠阳江-海南东部沿岸及韩江入海口重金属元素富集明显;Zn、V、Cr、Ni、Pb、Cu和Cd含量随Al或Sc的增加而线性增加,与沉积物粒径呈正相关,主要为同源性河流陆源碎屑组分输入,受河流入海口排沙和沿岸流的影响明显,人类干扰相对较弱。但As元素的富集不受沉积物颗粒粒度控制,其迁移能力弱,仍是南海北部海域陆架表层沉积物中受人类污染最敏感的元素。The surface sediments in northern South China Sea shelf(SCSS)carry the information of provenances of heavy metal elements and their environmental effects,potential ecological risks and their relationships with human activities.Thirty surface sedimentary samples were collected from the 27 sites in the northern SCSS during the 2016 summer survey.These samples are characterized by sand,silt,silty clay and clay with particles in size ranging from 0.77Φto 6.28Φ(average value of 3.43Φ).The heavy metal elements of Cu,Zn,As,Cd,Pb and V are higher than those in the upper crust and show the significant enrichment along the coastal areas of the Moyang River-Eastern Hainan and the Han River estuary.Zn,V,Cr,Ni,Pb,Cu and Cd contents increase with the amount of Al,Sc and the values of particle size,indicating their similar continental provenance of the weathering materials.Such a pattern is mainly controlled by both transportations from the Pearl River,Han River and Moyang River and coastwise current in the northern SCSS,with rare human interference.However,element As shows poor correlation with the particle size of the surface sediments,suggesting significant human interference and potential environmental pollution.

关 键 词：重金属元素 表层沉积物 陆源碎屑输入 南海北部陆架 

分 类 号：X55[环境科学与工程—环境工程]