ISO 10304-4-2022 PDF

Full title and description

ISO 10304-4:2022 — Water quality — Determination of dissolved anions by liquid chromatography of ions — Part 4: Determination of chlorate, chloride and chlorite in water with low contamination. This part of ISO 10304 specifies a validated ion‑chromatographic procedure and associated preparative and quality‑control measures for measuring chlorate, chloride and chlorite in low‑contamination waters such as drinking water, raw water and swimming‑pool water.

Abstract

This International Standard gives a procedure for the determination of the dissolved anions chlorate, chloride and chlorite in waters of low contamination. It describes appropriate sample pretreatment (e.g. dilution, handling for trace analyses), chromatographic separation by liquid ion chromatography and use of detectors suited to low‑level analysis (conductivity, UV or amperometric detection) as applicable. The document is intentionally general to accommodate a variety of column/detector assemblies and directs the user to the Bibliography for further analytical technique guidance.

General information

• Status: Published / Valid.
• Publication date: March 2022 (approved 3 March 2022).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 13.060.50 — Examination of water for chemical substances.
• Edition / version: Edition 2 (ISO 10304-4:2022), replaces ISO 10304-4:1997.
• Number of pages: 15 pages.

Scope

This part of ISO 10304 specifies a laboratory method for the determination of dissolved chlorate, chloride and chlorite at low concentration levels in waters with low contamination (for example drinking water, raw water and swimming‑pool water). The standard covers sample pretreatment guidance, chromatographic separation, selection and use of detectors appropriate for trace‑level anion analysis, calibration and basic quality‑control checks; it gives working ranges and notes how pretreatment or detector choice can extend sensitivity. The method is intentionally described in general terms to remain applicable across different suitable instrument assemblies.

Key topics and requirements

• Target analytes: chlorate, chloride and chlorite in low‑contamination waters.
• Analytical technique: liquid ion chromatography (anion exchange columns) with conductivity, UV or amperometric detection depending on analyte and required sensitivity.
• Sample pretreatment: dilution, filtration and other trace‑analysis preparations to avoid contamination and to adapt concentration to the working range.
• Calibration and working ranges: specified working ranges with options to extend detection limits through pre‑concentration or detector selection; calibration using standards of known concentration.
• Quality control: procedural blanks, replicate analysis, and use of appropriate reference materials or spiked recovery checks to verify accuracy at low levels.

Typical use and users

Laboratories performing regulatory or routine monitoring of drinking water, raw/source water and recreational waters; municipal and private water suppliers; environmental testing laboratories; contract analytical laboratories; researchers studying trace anions in low‑ionic‑strength matrices. Users generally require access to ion‑chromatography instrumentation, trained analysts and laboratory QA/QC procedures.

Related standards

ISO 10304 is a multipart series; related parts and complementary standards include ISO 10304‑1 (determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and sulfate), ISO 10304‑2 (historical — withdrawn; superseded by part 1), ISO 10304‑3 (determination of other anions such as chromate and thiocyanate), and other water‑quality standards covering sampling and laboratory competence such as the ISO 5667 sampling series and ISO/IEC 17025 for testing laboratory competence. Consult the ISO catalogue or national standards bodies for the definitive list and current versions.

Keywords

chlorate, chlorite, chloride, ion chromatography, anion analysis, water quality, drinking water, low contamination, conductivity detector, UV detector, amperometric detector, ISO 10304.

FAQ

Q: What is this standard?

A: ISO 10304-4:2022 is an ISO International Standard that specifies a method for determining dissolved chlorate, chloride and chlorite in waters with low contamination using liquid ion chromatography.

Q: What does it cover?

A: It covers sample pretreatment guidance, chromatographic separation and detector options (conductivity, UV, amperometric), calibration ranges and essential quality‑control measures for trace‑level determination of the three anions in low‑contamination water matrices.

Q: Who typically uses it?

A: Accredited and commercial water‑testing laboratories, municipal water authorities, environmental monitoring bodies, and researchers analyzing low‑level anions in drinking, raw and recreational waters.

Q: Is it current or superseded?

A: ISO 10304‑4:2022 is the current published edition (Edition 2, March 2022) and supersedes the earlier ISO 10304‑4:1997, which has been withdrawn.

Q: Is it part of a series?

A: Yes — it is Part 4 of the ISO 10304 series (water quality — determination of dissolved anions by liquid chromatography). Other parts (for example Part 1 and Part 3) address additional anions and matrices.

Q: What are the key keywords?

A: chlorate, chlorite, chloride, ion chromatography, anion exchange, water quality, trace analysis, conductivity detection, UV detection, amperometric detection, ISO 10304.