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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.
In September 2004, samples of water samples and surface sediments from different levels of the Yangtze River Estuary were collected using the “Marine Surveillance 47” scientific survey ship, and the contents of arsenic, The results showed that the contents of dissolved As and As (Ⅲ) in the Changjiang Estuary were 13.5 ~ 25.2nmol.L-1 and 5.22nmol.L-1 respectively, with the average contents of 17.9 and 1.76 nmol.L-1, and As (Ⅴ) -soluble arsenic was dissolved.The range of dissolved selenium was 1.50 ~ 5.70 nmol.L-1 with the average content of 3.35 nmol.L-1.The arsenic, There is a clear gradient in the distribution of selenium, with the concentration decreasing from the coast to the central sea area, the vertical distribution is even, the difference between the surface and the bottom is not significant, and the behavior of arsenic in the Changjiang estuary is conservative while the selenium obviously transits in the middle estuary. The distribution of dissolved selenium has a great influence on the dissolution of arsenic, but the content of arsenic and selenium in the bottom sediment has a wide range of variation, ranging from 3.87 to 13.1 mg.kg-1, from 0.0672 to 0.23 mg.kg-1, respectively Arsenic and selenium in the sediments of the mouth and adjacent sea areas mainly come from the Yangtze River.