Abstract
A new analytical procedure for sulphide in sea-water was developed using capillary isotachophoresis and a tubular microporous polytetrafluoroethylene membrane for preliminary enrichment. Hydrogen sulphide generated by adding sulphuric acid to the sea-water samples was allowed to permeate through the membrane and dissolved in sodium hydroxide solution. Barium cation-exchange resin was then added to the sodium hydroxide solution to remove the carbon dioxide dissolved. A linear calibration graph was obtained for artificial sea-water samples containing up to 2.0 mg/1 of sulphide. The method was applied to the determination of sulphide in surface and bottom sea-water samples.
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