IS 3025 : Part 32 : 2025 Methods of Sampling and Test (Physical and Chemical) for Water and Wastewater - Part 32 Chloride
1 SCOPE
1.1 This standard (Part 32) prescribes the following methods for the determination of chloride in water and wastewater:
a) Argentometric method (applicable in the range of 0.15 mg to 10 mg of chloride);
b) Mercuric nitrate method;
c) Potentiometric method;
d) Automated ferricyanide method;
e) Dissolved anions by liquid chromatography of ions (The lower limit of application is > = 0,1 mg/l for chloride. The lower limit of application depends on the matrix and the interferences encountered;
f) Liquid chromatographic separation using low-capacity anion exchanger (working range 0.1 mg/l to 50 mg/l); and
g) Photometric detection.
1.2 This standard prescribes four methods for the determination of chloride. The argentometric method is suitable for use in relatively clear waters when 0.15 mg to 10 mg of chloride is present in the portion titrated. The end point of mercuric nitrate method is easier to detect. Potentiometric method is suitable for coloured or turbid samples. The ferricyanide method is an automated technique. In case of any difference of opinion, the argentometric method shall be the referee method.
2 REFERENCES
The standards listed in Annex A contain provisions, which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards.
| IS No. | Title |
| IS 3025 | Methods of sampling and test (physical and chemical) for water and wastewater |
| (Part 75) : 2022/ISO 10304-1 : 2007 | Determination of dissolved anions by liquid chromatography of ions - Determination of bromide, chloride, fluoride, nitrate, nitrite phosphate and sulfate |
| (Part 81) : 2024/ISO 10304-4 : 2002 | Determination of chlorate, chloride and chlorite in water with low contamination |
| (Part 82) : 2024/ISO 15923-1 : 2013 | Ammonium, nitrate, nitrite, chloride, orthophosphate, sulfate and silicate with photometric detection |
| IS 7022 | Water related - Glossary of terms: |
| (Part 1) : 2024 | Water, sewage and industrial effluents (first revision) |
| (Part 2) : 2024 | Water supply and sewerage (first revision) |
| IS 17614 | Water quality - Sampling: |
| (Part 1) : 2025/ISO 5667-1 : 2023 | Guidance on the design of sampling programmes and sampling techniques (first revision) |
| (Part 3) : 2021/ISO 5667-3 : 2024 | Preservation and handling of water samples (first revision) |