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Abstract
Inductively coupled plasma mass spectrometry (ICP–MS) was coupled as a multielement detector for ion chromatography (IC) in analysis of chromium, arsenic and bromine species. The efforts were focused on selecting instrumental and operating conditions suitable for IC–ICP–MS. The choice of the eluent for IC was found to be critical. Ammonium buffer and nitric acid were suitable eluents since they did not cause polyatomic interferences or salt deposition on the cone orifices of ICP–MS. Cationic and anionic species could be analyzed simultaneously by coupled column IC–ICP–MS constructed by coupling anion and cation columns in series. This system was applied for speciation of chromium. A method for simultaneous analysis of toxic arsenic and chromium species was developed. Also an on–line preconcentration method allowing extremely low detection limits for bromine species is introduced. By using 5 mL injection volumes bromate and bromide could be analyzed at 0.2 μg L−1 level.
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