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ISO 9964-1:1993 Water quality - Determination of sodium and potassium - Part 1: Determination of sodium by atomic absorption spectrometry
standard by International Organization for Standardization, 05/01/1993
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The principle of the method specified is adding a caesium chloride solution to the sample as an ionization suppressant, aspirating the sample directly into the air/acetylene flame of an atomic absorption spectrometer and measuring the absorbance at a wavelength of 589,0 nm. Applies to water samples with a mass concentration of potassium in the range from 5 mg/l to 50 mg/l. This range can be extended if other dilution factors are chosen.