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A rapid and precise method for determining sulfate seawater, estuarine waters, and sediment pore waters 1
Author(s) -
Hoioarth Robert W.
Publication year - 1978
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.1978.23.5.1066
Subject(s) - sulfate , seawater , chemistry , titration , chloride , sediment , phosphate , environmental chemistry , barium sulfate , mineralogy , inorganic chemistry , chromatography , geology , oceanography , paleontology , organic chemistry
Sulfate can be rapidly and accurately measured by means of an indirect titration. Barium sulfate is precipitated in acid EDTA solution, the precipitate filtered and dissolved in an excess of EDTA at high pH, and the excess EDTA titrated with MgCl 2 . Interferences from chloride, iron, or phosphate are negligible. Sulfides may interfere, but there is a procedure to remove this interference. The method determines the sulfate concentration in 1.0 ml of seawater with a standard deviation consistently <0.5% of the mean determination of three replicates.