ISO 18412:2005 PDF

Name: ISO 18412:2005 — Water quality — Determination of chromium(VI) — Photometric method for weakly contaminated water
SKU: ISO 18412:2005
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Water quality — Determination of chromium(VI) — Photometric method for weakly contaminated water

Название (английский):

ISO 18412:2005

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

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 15 июня 2005 г.
Издание:: ISO IS 18412 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

ISO 18412:2005 specifies a method for the determination of chromium(VI) in drinking water in mass concentrations between 2 micrograms per litre and 50 micrograms per litre. For the determination of higher concentrations, the sample is diluted prior to analysis. The method may also be applied to weakly polluted ground and surface water, provided the matrix does not contain interfering reducing agents. This method was not used for estuarine water and seawater, so the user is responsible for the validation of the method for these matrices.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 18412:2005 specifies a photometric method for the determination of chromium(VI) in weakly contaminated waters, principally drinking water, within a working range of 2 µg/L to 50 µg/L. The method uses 1,5‑diphenylcarbazide (DPC) to form a red‑violet complex with chromium(VI) and measures the absorbance at 540 nm. Samples with higher chromium(VI) concentrations are diluted prior to analysis. The procedure is applicable to weakly polluted ground and surface waters provided no interfering reducing agents are present; it has not been validated for estuarine water or seawater.

Key topics and technical requirements

Analytical principle: Chromium(VI) oxidizes DPC to diphenylcarbazone, producing a coloured complex measured photometrically (max absorbance at 540 nm).

Measurement details:

Typical sample preparation: 40 mL sample + 4 mL acid mixture (H2SO4/H3PO4) + 500 µL 1% DPC in acetone, dilute to volume, stand 5–20 minutes, measure at 540 nm.
Photometer/cuvette path length: 50 mm recommended.

Calibration: Linear calibration evaluated per ISO 8466-1 (slope = sensitivity). Prepare matrix-matched standards (potassium chromate) and check calibration frequently (new reagent batches).

Interferences:

Reducing agents can cause negative bias-method not suitable where reducing agents are present.
Sulfide up to 0.2 mg/L does not interfere.
Common disinfectants tolerated up to specified limits: chlorine 0.6 mg/L, chlorine dioxide 0.4 mg/L, hydrogen peroxide 0.2 mg/L, ozone 0.1 mg/L.

Quality and sampling: Use water of analytical grade (ISO 3696) and sampling guidance from ISO 5667 series. Store samples refrigerated and analyse within 4 days.

Safety: Handle carcinogenic reagents (e.g., potassium dichromate) with appropriate laboratory safety.

Practical applications and users

Routine monitoring of drinking water for regulatory compliance and distribution system surveillance.

Environmental monitoring of weakly contaminated ground and surface waters where matrix validation confirms absence of interfering reducing agents.

Water quality laboratories, public health agencies, utilities, environmental consultancies and accreditation bodies implementing standardized chromium(VI) analysis.

Use cases include source-water screening, treatment verification, and spot checks after disinfection or industrial incidents.

Related standards

ISO 11083 - chromium(VI) determination in wastewater (spectrometric DPC method)

ISO 3696 - laboratory water quality

ISO 5667 series - sampling guidance

ISO 8466 series - calibration and evaluation of analytical methods

Keywords: ISO 18412:2005, chromium(VI), photometric method, water quality, drinking water, 1,5-diphenylcarbazide, spectrophotometry, chromium(VI) determination, calibration, sample preparation.

ISO 18412:2005 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

BS ISO 8466-1:2021

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

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

BS ISO 5667-21:2010

Water quality. Sampling - Guidance on sampling of drinking water distributed by tankers or means other than d…

ISO 11083:1994

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