北部湾北部滨海湿地沉积物中砷与镉和汞元素的分布与累积

甘华阳; 梁开; 林进清; 郑志昌; 闫章存

doi:10.3724/SP.J.1140.2013.03015

北部湾北部滨海湿地沉积物中砷与镉和汞元素的分布与累积

广州海洋地质调查局海洋环境地质与工程地质调查所, 广州 510760

基金项目:

中国地质调查局“华南西部滨海湿地地质调查与生态环境评价”项目(1212010914020)

详细信息

作者简介:
甘华阳(1979-),男,博士,工程师,从事海洋环境地质调查和研究,E-mail:ghuayang@126.com

中图分类号: P736.4
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出版历程
- 收稿日期: 2012-02-27
- 修回日期: 2012-05-29

DISTRIBUTION AND ACCUMULATION OF ARSENIC, CADMIUM AND MERCURY IN COASTAL WETLAND SEDIMENT OF NORTHERN BEIBU GULF

Division of Marine Environmental and Engineering Geology, Guangzhou Marine Geological Survey, Guangzhou 510760, China

摘要

摘要: 基于表层和柱状沉积物样品的理化分析和²¹⁰Pb、¹³⁷Cs测年,揭示了北部湾北部滨海湿地(0~6 m水深范围)沉积物中砷(As)、镉(Cd)和汞(Hg)元素的空间分布特征、近百年来的累积趋势及控制因素。结果表明研究区表层沉积物类型主要为砂,并且大风江口以东沉积物的粒度比以西的要粗;表层沉积物中As、Cd、Hg和有机质的含量分别是(8.11±5.80)、(0.08±0.11)、(0.034±0.028)μg/g和(0.73±0.74)%,铁山港顶部、南流江口东部、钦州湾和大风江口中部表层沉积物中3种元素含量相对较高;沉积物的粒度是控制元素空间分布的最主要因素,从钦江口、南周江(南流江)口和山口红树林保护区获得柱状样所处区域的平均沉积速率在20世纪20年代至今分别为0.93、1.75和1.35 cm/a;3个柱状样中As、Cd和Hg的含量在20世纪80年代中期至2000s中期呈现出明显增加的趋势,特别是钦江口和南周江(南流江)口区。河口区及上游沿岸人类活动对这些元素的输入是其近20年来含量增加的主要原因。
- 砷、镉、汞 /
- 分布与累积 /
- 沉积物 /
- 滨海湿地 /
- 北部湾北部
Abstract: The spatial distribution, accumulation mechanism and controlling factors of Arsenic, Cadmium and Mercury in the last hundred years were studied based on the chemical and ²¹⁰Pb, ¹³⁷Cs dating data from the surface and coring sediments retrieved from the coastal wetland of north Beibu Gulf within a water depth of 0~6 m. The surface sediment is dominated by sand. The grain size of the sediment in the eastern part is coarser than that in the western part to the Dafeng river estuary. The contents of As, Cd, Hg and organic matter in the surface sediment are 8.11±5.80 μg/g、0.08±0.11 μg/g、0.034±0.028 μg/g and (0.73±0.74)%, respectively. High anomalies are found in the top part of the Tieshangang bay, the east estuary of the Nanliu river, the Qinzhou bay and the middle part of the Dafeng river estuary. Grain size is the principle factor controlling the elements distribution pattern in the surface sediment. The average sedimentation rates are 0.93 cm/a, 1.75 cm/a and 1.35 cm/a for the three cores collected from the Qin river estuary, Nanzhou (Nanliu) river estuary and Shankou mangrove conservation area during the period from 1920s to 2008, determined by ²¹⁰Pb and ¹³⁷Cs dating. The contents of As, Cd and Hg show an increasing trend in the period from 1985s to 2008, particularly for the cores retrieved from the estuaries of Qin river and Nanliu river due to the impacts of human activities.
- Arsenic,Cadmium,Mercury /
- distribution and accumulation /
- sediment /
- coastal wetland /
- northern Beibu Gulf

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