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Elimination of dissolved sulfide interference in the flow injection determination of SCO2, by addition of molybdate
Author(s) -
Lustwerk Rigel L.,
Burdige David J.
Publication year - 1995
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1995.40.5.1011
Subject(s) - sulfide , coprecipitation , molybdate , chemistry , flow injection analysis , inorganic chemistry , chromatography , organic chemistry , detection limit
A previously described flow injection method for the analysis of ΣCO 2 included the addition of ZnCl 2 to some samples before analysis in order to precipitate dissolved sulfide (which interferes with the method) as ZnS. However, the use of Zn 2+ in samples with high concentrations of dissolved sulfide causes the coprecipitation of ZnCO3, and in our experience with this technique, ZnCO 3 also precipitates even in the absence of dissolved sulfide. The addition of molybdate effectively complexes dissolved sulfide without interfering with the determination of ΣCO 2 by this technique.