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This International Standard specifies two methods for the determination of chromium in water by atomic absorption spectrometry. The two methods are covered in separate clauses as follows:

• Clause 3: Determination of chromium by flame atomic absorption spectrometry;
• Clause 4: Determination of chromium by electrothermal atomization atomic absorption spectrometry.

Clause 3 is applicable to the analysis of water and waste water when the concentration range is between 0,5 mg/l and 20 mg/l of chromium. When the concentration is below 0,5 mg/l, the determination can be carried out after carefully evaporating an acidified sample to small volume, taking care to avoid the formation of a precipitate.

Clause 4 is applicable to the analysis of water and waste water when the concentration range is between 5 μg/l and 100 μg/l of chromium by injecting a sample volume of 20 μl. It is applicable to the determination of higher concentrations by using a smaller sample volume.