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ISO/DIS 21027

Water quality — Determination of total organic carbon in water samples containing suspended solids by combined ultrasonic and alkaline extraction pretreatment

General information

40.20   DIS ballot initiated: 12 weeks   Jul 21, 2026

ISO

ISO/TC 147/SC 2 Physical, chemical and biochemical methods

International Standard

13.060.50   Examination of water for chemical substances

Scope

This document specifies a method for optimizing measurements of the total organic carbon (TOC) content in water samples containing high loads of suspended solids (SSs) with particulate organic carbon (POCsusp) (e.g., waste water, storm water, raw water, surface water, and sea water), following a combined ultrasonic and alkaline extraction (CUAL) sample-pretreatment method.
The method shall use a turbidity ratio (i.e., NTU5/NTU0) to evaluate the adequacy the pretreatment for samples containing SSs as an evaluation index of sample homogeneity (10.2).
The analysis procedure shall be outperformed instrumentally using a differential method (e.g., TC-TIC) to quantify TOC.

Life cycle

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ISO/DIS 21027
40.20 DIS ballot initiated: 12 weeks
Jul 21, 2026