Automatic determination of inorganic carbon in surface waters |
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Authors: | Joan Crowther WB Moody |
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Institution: | Water Quality Section, Ontario Ministry of the Environment, Rexdale, Ontario M9W 5L1 Canada |
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Abstract: | An automated colorimetric procedure was developed for the determination of inorganic carbon in the range 0.3–40.0 mg l-1, and then modified to handle concentrations in the range 0.01–2.00 mg l-1. The procedure entailed conversion of carbon dioxide equilibria products to carbon dioxide. By gas dialysis, a portion of this gas was dissolved in a weakly buffered alkaline phenolphthalein solution, and inorganic carbon was determined by measuring the loss in color of the indicator. Calibrations were linear within 1% full scale. When surface water samples were processed by the subject and by alternative methods, the colorimetric carbon results were lower by approximately 1% full scale. |
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