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This International Standard describes two atomic absorption spectrometric (AAS) methods for the determination of aluminium in water. 1.1 Flame AAS The flame AAS method (clause 2) is applicable for the determination of aluminium in water in mass concentrations from 5 mg/l to 100 mg/l. Higher concentrations may be determined after an appropriate dilution of the sample. Careful evaporation of the sample, acidified with nitric acid, may be used to extend the working range of the method to lower concentrations as long as no precipitation is observed. NOTE - If the linear range of the instrument is sufficiently large, concentrations