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This International Standard specifies two methods for the determination of chloride by flow analysis. The two basic methods are covered in separate clauses as follows:

• Clause 3: Determination of chloride by flow analysis and photometric detection.
• Clause 4: Determination of chloride by flow analysis and potentiometric detection.

Both methods are applicable to the analysis of water and waste water (including leachates) containing chloride in the concentration range from 1 mg/l to 1000 mg/l. On a case-by-case basis the range of the analysis can be changed.

After dilution, samples with a chloride concentration > 1000 mg/l can also be analysed.

The method with potentiometric detection is also applicable to turbid and/or coloured samples.