ISO 23631-2006 PDF

Full title and description

ISO 23631:2006 — Water quality — Determination of dalapon, trichloroacetic acid and selected haloacetic acids — Method using gas chromatography (GC‑ECD and/or GC‑MS detection) after liquid‑liquid extraction and derivatization. The standard specifies a laboratory analytical procedure for selected haloacetic acids (including trichloroacetic acid) and the herbicide dalapon in ground and drinking water using derivatization (diazomethane) followed by GC detection.

Abstract

This International Standard describes a method to determine dalapon, trichloroacetic acid (TCA) and selected haloacetic acids in groundwater and drinking water. The procedure uses liquid‑liquid extraction, derivatization (diazomethane) and analysis by gas chromatography with either electron‑capture detection (GC‑ECD) and/or mass spectrometric detection (GC‑MS). Typical applicable concentration range is approximately 0.5 to 10 µg/L, with validated reporting limits for TCA and dalapon around 0.05 µg/L; ECD generally provides lower detection limits while MS adds confirmatory identification.

General information

• Status: Published (International Standard; confirmed at periodic review).
• Publication date: 2006 (Edition 1, published February 2006; entries show publication activity around 30 January – February 2006).
• Publisher: ISO — International Organization for Standardization.
• ICS / categories: 13.060.50 (Examination of water for chemical substances).
• Edition / version: Edition 1 (2006).
• Number of pages: 24 (ISO published document).

Scope

Applies to determination of dalapon, trichloroacetic acid and selected haloacetic acids in ground water and drinking water using liquid‑liquid extraction, derivatization with diazomethane and subsequent gas chromatographic analysis (GC‑ECD and/or GC‑MS). The method is intended for concentrations roughly between 0.5 µg/L and 10 µg/L and may be applicable to additional compounds or water types provided applicability is verified.

Key topics and requirements

• Target analytes: dalapon, trichloroacetic acid (TCA) and selected haloacetic acids (see standard for table of compounds and retention data).
• Sample types: ground water and drinking water; guidance on matrix applicability and verification for other matrices.
• Sample preparation: liquid‑liquid extraction followed by derivatization using diazomethane to form volatile derivatives suitable for GC analysis.
• Instrumental detection: gas chromatography with electron‑capture detection (GC‑ECD) for low detection limits and/or GC‑MS for identification/confirmation.
• Analytical performance: applicable concentration range ~0.5–10 µg/L; validated reporting limit for TCA and dalapon ≈ 0.05 µg/L (refer to tables and annexes in the standard).
• Quality and verification: method requires appropriate calibration, use of blanks and controls, and verification of applicability when used for additional compounds or unusual matrices.

Typical use and users

Used by environmental and public‑health laboratories, drinking water testing laboratories, water utilities, regulatory agencies, research institutions and consultants performing trace analysis of haloacetic acids and related compounds in potable and groundwater. The method supports regulatory monitoring, compliance testing, contamination investigations and research on disinfection by‑products or herbicide residues.

Related standards

Standards referenced or commonly used with ISO 23631 include ISO 5667 series (water sampling guidance), ISO 3696 (water for analytical laboratory use) and other water quality analytical methods and regional/adopted versions (EN/ISO adoptions and corrigenda). A European corrigendum/adoption (EN ISO 23631:2006 with corrections in 2007) exists for the EN adoption.

Keywords

dalapon, trichloroacetic acid, haloacetic acids, haloacetic acids (HAA), TCA, water quality, gas chromatography, GC‑ECD, GC‑MS, liquid‑liquid extraction, derivatization, diazomethane, drinking water analysis, groundwater analysis.

FAQ

Q: What is this standard?

A: ISO 23631:2006 is an ISO International Standard that defines a laboratory method for determining dalapon, trichloroacetic acid and selected haloacetic acids in ground and drinking water by liquid‑liquid extraction, derivatization and gas chromatography (GC‑ECD and/or GC‑MS).

Q: What does it cover?

A: It covers sample preparation (liquid‑liquid extraction), chemical derivatization (diazomethane), chromatographic separation and detection options (ECD and MS), applicability ranges (about 0.5–10 µg/L) and validated reporting limits (TCA and dalapon ≈ 0.05 µg/L), plus quality/verification recommendations.

Q: Who typically uses it?

A: Analytical chemistry and environmental testing laboratories, water utilities, regulators and researchers concerned with drinking water and groundwater monitoring for haloacetic acids and related organic contaminants.

Q: Is it current or superseded?

A: As published in 2006 (Edition 1), ISO records show the document as published and subject to periodic review; a European adoption has a corrigendum (2007). Consult ISO or your national standards body for the latest status or any replacement/amendment after 2019–2020 if up‑to‑date confirmation is required.

Q: Is it part of a series?

A: It is part of the general body of ISO water‑quality analytical standards and is commonly used alongside sampling standards (ISO 5667 series) and laboratory water/quality guidance (ISO 3696); national and regional adoptions (EN/ISO) may bundle or reference it with other water quality methods.

Q: What are the key keywords?

A: dalapon, trichloroacetic acid (TCA), haloacetic acids, GC‑ECD, GC‑MS, liquid‑liquid extraction, derivatization, diazomethane, drinking water analysis, groundwater.