ISO 18724:2025 PDF

Name: ISO 18724:2025 — Water quality — Determination of dissolved chromium(VI) in water — Photometric method
SKU: ISO 18724:2025
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Water quality — Determination of dissolved chromium(VI) in water — Photometric method

Название (английский):

ISO 18724:2025

Water quality — Determination of dissolved chromium(VI) in water — Photometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 29
Дата публикации:: 1 октября 2025 г.
Издание:: ISO IS 18724 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

This document specifies a method for the photometric determination of dissolved chromium(VI) using manual, (e.g. hand photometry), automated static (e.g. discrete analyser system) or automated dynamic [e.g. flow injection analysis (FIA), continuous flow analysis (CFA)] or ion chromatography with post-column reaction (IC-PCR)] techniques. The method described in this document is applicable for other matrices, such as leachates from landfills and raw wastewater, after appropriate method validation.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 18724:2025 - Water quality - Determination of dissolved chromium(VI) in water - Photometric method specifies a unified photometric procedure for measuring dissolved hexavalent chromium (chromium(VI), Cr(VI)) in water. The method uses the 1,5-diphenylcarbazide (DPC) colour reaction and is applicable with manual photometry, automated static systems (discrete analysers), automated dynamic techniques (flow injection analysis - FIA, continuous flow analysis - CFA) and ion chromatography with post‑column reaction (IC‑PCR). Matrices covered include drinking water, raw and surface waters, cooling water, treated wastewater and, after validation, leachates and raw wastewater.

Key topics and technical requirements

Principle: Cr(VI) forms a red‑violet chromium–DPC complex; absorbance measured at (540 ± 10) nm (λmax ≈ 544 nm).

Measurement techniques: manual, automated static, automated dynamic (FIA/CFA) and IC‑PCR - choice depends on required sensitivity and expected concentration.

Analytical range: typical static, FIA and CFA techniques suit concentrations ≥ 2 µg/L; using long-path cuvettes (>100 mm) lowers limits; IC‑PCR enables determination down to ≈ 0.02 µg/L.

Calibration and QC: calibration according to ISO 8466-1 or ISO 8466-2; guidance on analytical quality control per ISO/TS 13530.

Sampling and preservation: avoid acidic preservation (prevents Cr(VI) reduction/oxidation artifacts); adjust pH between 8 and 9.5 when required; reducing or oxidizing substances must be considered and may require chemical treatment (e.g., sodium sulfite to remove oxidants, removal of excess sulfite with sodium hypochlorite). Cation exchange cartridges or precipitation can remove Cr(III) when needed.

Interferences: oxidants (free chlorine, chlorine dioxide, H2O2, ozone) have specified upper tolerance limits (e.g., chlorine 0.6 mg/L, chlorine dioxide 0.4 mg/L, H2O2 0.2 mg/L, ozone 0.1 mg/L); sulfide > 0.2 mg/L interferes; vanadium, molybdenum, mercury and high iron can affect readings-matrix validation and spike recovery checks recommended.

Performance and reporting: procedures, calculation methods, validity checks and reporting requirements are specified, with annexes covering manual/static/dynamic setups and reagent adjustments.

Applications and users

Who uses it: environmental and water laboratories, public‑health authorities, utilities, industrial wastewater monitoring labs, landfill leachate analysts and regulatory testing bodies.

Practical uses: routine monitoring of drinking water and source waters for public safety, industrial effluent compliance, contamination investigations, and research on Cr(VI) mobility in environmental matrices.

Related standards

Keywords: ISO 18724:2025, chromium(VI) determination, dissolved chromium, photometric method, 1,5-diphenylcarbazide, FIA, IC‑PCR, water quality, analytical method, sample preservation.

ISO 18724:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 11083:1994

Water quality — Determination of chromium(VI) — Spectrometric method using 1,5-diphenylcarbazide

ISO 18412:2005

Water quality — Determination of chromium(VI) — Photometric method for weakly contaminated water

ISO 23913:2006

Water quality — Determination of chromium(VI) — Method using flow analysis (FIA and CFA) and spectrometric de…

BS ISO 8466-1:2021

Water quality. Calibration and evaluation of analytical methods - Linear calibration function

SIST ISO 8466-2:2004

Water quality -- Calibration and evaluation of analytical methods and estimation of performance characteristi…

SIST-TS ISO/TS 13530:2013

Water quality - Guidance on analytical quality control for chemical and physicochemical water analysis