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Selective determination of trace arsenic and antimony species in natural waters by gas chromatography with a photoionization detector
Author(s) -
Yamamoto Masahiro,
Tanaka Shigeru,
Hashimoto Yoshikazu
Publication year - 1992
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590060407
Subject(s) - chemistry , antimony , stibine , arsenic , arsine , inorganic chemistry , sodium hydroxide , nuclear chemistry , catalysis , organic chemistry , phosphine
Traces amounts of arsenic and antimony in water samples were determined by gas chromatography with a photoionization detector after liquidnitrogen cold trapping of their hydrides. The sample solution was treated with sodium hydroborate (NaBH 4 ) under weak‐acid conditions for arsenic(III) and antimony(III) determination, and under strong‐acid conditions for arsenic(III+V) and antimony(III+V) determination. Large amounts of carbon dioxide (CO 2 ) and water vapor obscured determination of arsine and stibine. Better separation from interference could be achieved by removing CO 2 and water vapor in two tubes containing sodium hydroxide pellets and calcium chloride, respectively. The detection limits of this method were 1.8 ng dm −3 for arsenic and 9.4 ng dm −3 for antimony in the case of 100‐cm 3 sample volumes. Therefore, it is suitable for determination of trace arsenic and antimony in natural waters.

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