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ISO 7980:1986 Water quality - Determination of calcium and magnesium - Atomic absorption spectrometric method
standard by International Organization for Standardization, 05/01/1986
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The procedure is intended for the analysis of raw and drinking waters and can be used for waters having a calcium content of up to 50 mg/l and a magnesium content of up to 5 mg/l. For samples containing higher concentrations of calcium or magnesium a smaller volume of the sample must be taken for the analysis.