UNE-EN ISO 18724:2026

This document specifies a method for the photometric determination of dissolved chromium(VI) using

manual, e.g., hand photometry, or automated static, e.g., discrete analyser system, or automated dynamic

techniques, e.g., flow injection analysis (FIA), continuous flow analysis (CFA), or ion chromatography with

post-column derivatization (IC-PCR).

The choice of the analytical technique to be used and needs-based sample preparation (e.g., matrix

elimination) enables the determination of chromium(VI) in concentrations e"0,02 ¼g/l in raw water,

drinking water, surface water, aqueous eluates, cooling water and treated wastewater, provided that the

Matrix does not contain any reducing substances. Typical areas of application for the static techniques as

well as FIA and CFA are samples with chromium(VI) concentrations e"2 ¼g/l. When using cuvettes with

large optical path lengths, e.g. >100 mm, the range of application can be extended to concentrations