Abstract
A colorimetric determination of sulphate in freshwater with BaCrO4 as reagent is described. We consider the method to be simple, fast and precise (sd = 0.6% at 0.7 mM; N = 10). The method is valid in the range of 0.00025 M up to 0.002 M; lower concentrations can be measured by omitting a dilution step. For higher concentrations a smaller sample should be diluted. The chromate spectrum and its ionic distribution as function of pH and dilution are given.
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References
Kolthoff, I. M. & R. Belcher, 1957. Volumetric Analysis Vol. III. Interscience Publishers, New York. 714 pp.
Treadwell, F. P. & W. T. Hall, 1948. Analytic Chemistry, Vol. II, 9th edn. John Wiley, New York. 806 pp.
Wildenstein, R. Z., 1862. Anal. Chim. Acta. 1, 323. As quoted in Kolthoff & Belcher, 1957.
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Golterman, H.L., De Graaf Bierbrauwer-Würtz, I.M. Colorimetric determination of sulphate in freshwater with a chromate reagent. Hydrobiologia 228, 111–115 (1992). https://doi.org/10.1007/BF00006199
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DOI: https://doi.org/10.1007/BF00006199