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引用本文:张玉宝,徐颖,储昭升,金相灿,张凤荣,曾清如.洞庭湖平原中小型湖群沉积物中砷污染特征与评价.湖泊科学,2011,23(5):695-700. DOI:10.18307/2011.0505
ZHANG Yubao,XU Ying,CHU Zhaosheng,JIN Xiangcan,ZHANG Fengrong,ZENG Qingru.Characteristics and evaluation of As pollution in the sediments of medium-small scale lakes in Lake Dongting Plain. J. Lake Sci.2011,23(5):695-700. DOI:10.18307/2011.0505
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洞庭湖平原中小型湖群沉积物中砷污染特征与评价
张玉宝1,2, 徐颖1, 储昭升2, 金相灿2, 张凤荣2,3, 曾清如3
1.辽宁工程技术大学资源与环境工程学院, 阜新 123000;2.中国环境科学研究院湖泊生态环境创新基地, 北京 100012;3.湖南农业大学资源环境学院, 长沙 410128
摘要:
本文研究了洞庭湖平原10个中小型湖泊沉积物砷的空间分布特征, 并采用地累积指数法对其污染进行了评价.结果表明:各湖表层沉积物中砷浓度在10.1-33.7mg/kg之间变化, 平均值为15.8mg/kg, 砷含量水平较低;在空间上表层沉积物中砷含量次序为岳阳南湖 >芭蕉湖 >黄盖湖 >安乐湖 >毛里湖 >柳叶湖 >东湖 >珊珀湖 >大通湖 >北民湖, 表现为澧水水系湖泊(均值13.1mg/kg)和藕池河水系湖泊(均值13.4mg/kg) <沅水水系湖泊(均值16.2mg/kg) <洞庭湖湖口附近湖泊(均值22.4mg/kg), 基本遵循从洞庭湖水系上游到下游逐渐加重的趋势;大通湖、黄盖湖、芭蕉湖和珊珀湖4个湖泊柱状样数据显示洞庭湖区中小型湖泊沉积物中砷有一定的累积作用;地累积指数评价结果显示洞庭湖平原各中小型湖泊表层沉积物中砷污染总体较轻, 其中8个湖泊22个点位没有污染, 5个湖泊7个点位属于轻度污染。
关键词:    沉积物  湖泊群  洞庭湖平原
DOI:10.18307/2011.0505
分类号:
基金项目:科技部科技基础性工作专项项目(2006FY110600);国家"973"计划项目(2012CB417004)联合资助
Characteristics and evaluation of As pollution in the sediments of medium-small scale lakes in Lake Dongting Plain
ZHANG Yubao1,2, XU Ying1, CHU Zhaosheng2, JIN Xiangcan2, ZHANG Fengrong2,3, ZENG Qingru3
1.College of Resources and Environmental Engineering, Liaoning Technical University, Fuxin 123000, P.R.China;2.Research Center of Lake Eco-Environments, Chinese Research Academy of Environmental Sciences, Beijing 100012, P.R.China;3.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, P.R.China
Abstract:
Spatial distribution of arsenic (As) concentrations of sediments collected form ten medium-small scale lakes in Lake Dongting Plain was investigated, and the As pollution degree was evaluated using the geo-accumulation index.Average value of As sediment concentration from 10 lakes was 15.8 mg/kg, which varied from 10.1 to 33.7 mg/kg.It indicated that As sediment con-tamination was relative low.As to spatial distributions, the average contents of As in the superficial sediments were from high to low in the sequence of Yueyang South Lake, Bajiao Lake, Huanggai Lake, Anle Lake, Maoli Lake, Liuye Lake, Dong Lake, Shanpo Lake, Datong Lake, and Beimin Lake.As concentrations in the lake basins were from low to high in sequence of Lishui catchment (13.1 mg/kg), Ouchi catchment (13.4 mg/kg), Yuanshui catchment (16.2 mg/kg), and lakes at outlet areas of Dongting Lake (22.4 mg/kg).Degree of As pollution in lake sediments aggravated gradually from the upstream to the downstream of Lake Dongting drainage.Sediment sample analysis from 4 cores (Datong Lake, Huanggai Lake, Bajiao Lake and Shanpo Lake) showed that As had accumulated in sediments and increased from the bottom to the surface (30-0 cm).Geo-accumulation index a-nalysis showed that pollution level at 22 sites from eight lakes were none, and 7 sites from five lakes were at Level I.As a whole of Lake Dongting drainage, As pollution level in the superficial sediments was low.
Key words:  Arsenic  sediment  lake group  Lake Dongting Plain
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