Name: EN 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 (ISO 23631:2006)
SKU: EN ISO 23631:2006
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Abstract

Overview

EN ISO 23631:2006 - Water quality - Determination of dalapon, trichloroacetic acid and selected haloacetic acids - Method using gas chromatography (GC‑ECD and/or GC‑MS) after liquid‑liquid extraction and derivatization (ISO 23631:2006) is a CEN‑adopted ISO method for measuring specific haloacetic acids (HAAs) and dalapon in groundwater and drinking water. The method combines liquid‑liquid extraction with methylation (diazomethane) and analysis by GC‑ECD and/or GC‑MS. Typical applicable concentrations are 0.5–10 µg/L; validated reporting limits for trichloroacetic acid (TCA) and dalapon are about 0.05 µg/L. ECD generally provides lower detection limits; MS provides reliable compound identification.

Key topics and requirements

Sample preparation: acidification, extraction with methyl‑tert‑butyl ether (MTBE), concentration by evaporation.
Derivatization: methylation of acids using diazomethane to form volatile methyl esters prior to GC analysis.
Instrumentation: capillary gas chromatography with electron‑capture detector (GC‑ECD) and/or mass spectrometry (GC‑MS).
Detection & performance:
- Method applicable in the 0.5–10 µg/L range depending on matrix.
- Reporting limits: ~0.05 µg/L for TCA and dalapon.
- ECD = better sensitivity; MS = confirmatory identification.
Calibration and quality control:
- Use of methylated and non‑methylated reference substances.
- Multipoint calibration and spiking for overall recovery assessment.
Interferences and precautions:
- Suspended solids may affect extraction - filtration may be required.
- Solvent and reagent purity (solvents, NaCl) impact blanks and detection.
- Safety warning: diazomethane is explosive and highly toxic - strict laboratory safety and trained personnel required.

Applications

Routine monitoring of drinking water and groundwater for haloacetic acids and dalapon.
Regulatory compliance testing, water utilities, environmental monitoring, and contract analytical laboratories.
Source water assessments where disinfection by‑products and herbicide residues are a concern.
Method used when low‑level detection and reliable identification of HAAs/dalapon are needed.

Who should use this standard

Water analysis laboratories (public and private)
Environmental and public health agencies
Drinking water utilities and quality assurance teams
Researchers studying disinfection by‑products and agricultural contaminants

Related standards

ISO 3696 - Water for analytical laboratory use
ISO 5667 series - Water sampling guidance (Parts 1, 2, 3)
CEN adoption: EN ISO 23631:2006

This standard is essential for labs requiring a validated GC‑based method for trace determination of dalapon, TCA, and selected haloacetic acids in potable and groundwater matrices.

EN ISO 23631:2006 PDF

Похожие стандарты

Abstract

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

Технические детали

ISO 23631:2006

Water quality — Determination of dalapon, trichloroacetic acid and selected haloacetic acids — Method using g…

SIST EN ISO 3696:1998

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BS ISO 5667-21:2010

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