title: Determination of ammonium ion in sea-water by capillary isotachophoresis.
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 mug/1. ammonium ion. The method has been applied to the determination of ammonium ion in surface and bottom sea-water samples.
authors.affiliation: Kobe University of Mercantile Marine, Fukae, Higashinada, Kobe 658, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Fukushi
authors.forename: K
authors.initials: K
authors.lastname: Hiiro