Separation and determination of arsenic(V) and arsenic(III) in sea-water by solvent extraction and atomic-absorption spectrophotometry by the hydride-generation technique.
Separation and determination of arsenic(V) and arsenic(III) in sea-water by solvent extraction and atomic-absorption spectrophotometry by the hydride-generation technique.
复制标题
溶剂萃取-氢化物发生原子吸收分光光度法分离测定海水中砷(V)和砷(III)。
DOI：
10.1016/0039-9140(85)80037-0
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发表时间：
1985
期刊：
影响因子：
6.1
通讯作者：
J. L. Fasching
中科院分区：
文献类型：
--
作者：
Samuel A. Amankwah;J. L. Fasching
通过将砷 (III) 与吡咯烷二硫代氨基甲酸铵 (APDC) 在 4.0–4.5 范围内络合并用氯仿萃取络合物，分离了海水中的砷 (V) 和砷 (III)。然后用浓硝酸和高氯酸的 1:1 混合物湿灰化有机相以除去所有有机物，并通过氢化物发生和原子吸收分光光度法测定砷 (III)。总砷的测定方法是首先用碘化钾将砷 (V) 还原为砷 (III)，然后应用测定砷 (III) 的方法。通过差值测定砷(V)含量。 0.031 ng ml 的低检出限以及高灵敏度和精密度使该方法适用于公海水域的分析。
Arsenic (V) and arsenic (III) in sea-water have been separated by complexing the arsenic (III) with ammonium pyrrolidinedithiocarbamate (APDC) in the range 4.0–4.5 and extracting the complex with chloroform. The organic phase is then wet-ashed with a 1: 1 mixture of concentrated nitric acid and perchloric acid to get rid of all organics, and the arsenic (III) is determined by hydride generation and atomic-absorption spectrophotometry. Total arsenic is determined by first reducing arsenic (V) to arsenic (III) with potassium iodide and then applying the method used for arsenic (III). The arsenic (V) content is determined by difference. The low detection limit of 0.031 ng ml and the high sensitivity and precision make the method suitable for analysis of open ocean waters.