Abstract
A new procedure for determination of ammonium ion in sea-water by means of capillary isotachophoresis and a gas—liquid separator with a tubular microporous polytetrafluoroethylene membrane for preliminary enrichment has been developed. Ammonia generated by adding sodium hydroxide solution to the sea-water samples is allowed to permeate through the membrane and then dissolve in sulphuric acid. A linear calibration graph has been obtained with artificial sea-water samples containing up to 300 μg/1. ammonium ion. The method has been applied to the determination of ammonium ion in surface and bottom sea-water samples.
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