摘要
2004年9月利用"海监47号"科学调查船在长江口海域采集不同层次的水样及表层沉积物样品,利用氢化物发生原子吸收光谱法测定水样及底沉积物中砷、硒的含量.结果表明,长江口海域溶解砷、As(Ⅲ)含量的变化范围分别为13.5～25.2nmol.L-1、未检出～5.22 nmol.L-1,平均含量分别为17.9、1.76 nmol.L-1;溶解砷以As(Ⅴ)为主.溶解硒的变化范围分别为1.50～5.70 nmol.L-1,平均含量为3.35 nmol.L-1.长江口及邻近海域溶解砷、硒的平面分布存在明显的梯度,浓度由沿岸向中央海区递减,垂直分布较均匀,表、底层差别不大.长江口砷的行为是保守的,而硒在河口中部明显存在转移.生物作用对溶解硒的分布影响较大,而对溶解砷的影响不明显.底沉积物砷、硒含量变化范围较大,分别为3.87～13.1 mg.kg-1、0.067～0.23mg.kg-1,长江口及邻近海域沉积物中砷、硒主要来自长江的输送.
One cruise of ＂Haijian 47＂ was carried out in September 2004, to understand the behaviors of selenium and arsenic in the Yangtze Estuary and its adjacent areas. Selenium and arsenic species are determined by HG-AAS. Concentrations rang from 13.5 nmol·L^-1 to 25.2 nmol·L^-1 for arsenic, under detection to 5.22 nmol·L^-1 for As（ Ⅲ ）, 1.50 nmol·L^-1 to 5.70 nmol·L^-1 for selenium, with average of 17.9 nmol·L^-1, 1.76 nmol·L^-1 and 3.35 nmol·L^-1, respectively. Concentrations of arsenic and selenium decrease gradually from Yangtze Estuary to the East China Sea. The high concentration of arsenic appears mainly in the Yangtze diluted water area and the coastal water area of Jiangsu and Zbejiang, and the low values is present at the southeast part of study area showing the influence of the Kuroshio water. The data indicates that selenium did not behave conservatively in the estuary, but arsenic behaves conservatively. An important mobilization of selenium is observed from the river up to halfway in the estuary. Concentrations in the sediment range from 3,87 mg·kg^-1 to 13.1 mg·kg^-1 for arsenic, 0.067mg·kg^-1 to 0.23 mg·kg^-1 for selenium. Yangtze input is the main source of arsenic and selenium in the sediment.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期33-38,共6页
Environmental Science
基金
国家重点基础研究规划(973)项目(2002CB412405)
国家自然科学基金项目(40876038
40476036)
关键词
长江口
砷
硒
行为
Yangtze Estuary
arsenic
selenium
behavior
