SIST EN ISO 7393-3:2000 PDF

Name: SIST EN ISO 7393-3:2000 — Water quality - Determination of free chlorine and total chlorine - Part 3: Iodometric titration method for the determination of total chlorine (ISO 7393-3:1990)
SKU: SIST EN ISO 7393-3:2000
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Water quality - Determination of free chlorine and total chlorine - Part 3: Iodometric titration method for the determination of total chlorine (ISO 7393-3:1990)

Название (английский):

SIST EN ISO 7393-3:2000

Water quality - Determination of free chlorine and total chlorine - Part 3: Iodometric titration method for the determination of total chlorine (ISO 7393-3:1990)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 1 декабря 2000 г.
ICS:: 13.060.50
Технический комитет:: KAV - Water quality

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Описание (английский):

Specifies a procedure for water. It is applicable for the measurement of concentrations, in terms of chlorine, from 0,01 to 0,21 mmol/l. The interfering substances are given. In annex B a procedure for direct titration is specified. It is usually applied to chlorine concentrations above 7 mol/l in treated drinking water.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN ISO 7393-3:2000 (CEN adoption of ISO 7393-3:1990) defines an iodometric titration method for the determination of total chlorine in water. The method measures total chlorine (free + combined chlorine, e.g., chloramines) over the range 0.01 to 0.21 mmol/L (about 0.71–15 mg/L). Annex B describes a direct titration variant typically used for treated drinking water at concentrations above 7 µmol/L (≈0.5 mg/L). This standard is intended for routine laboratory analysis within water quality monitoring and treatment control.

Key topics and requirements

Scope and limits: Applicable for total chlorine expressed as chlorine (Cl2) from 0.01–0.21 mmol/L; direct titration for higher concentrations (Annex B).

Analytical principle: Oxidation of iodide to iodine by total chlorine in acid solution, reduction of released iodine by a known excess of sodium thiosulfate, and back-titration with potassium iodate (iodometric titration).

Reagents and apparatus: Specifies analytical-grade reagents (potassium iodide, phosphoric acid, starch indicator), sodium thiosulfate and potassium iodate standard solutions (both 10 mmol/L examples in the text), and standard laboratory glassware (chlorine-demand free).

Sampling: Advises immediate analysis after sampling and references sampling guidance in ISO 5667-1 and ISO 5667-2.

Interferences: Method is valid only in the absence of other oxidizing agents - e.g., bromine/iodine species, bromamines/iodoamines, ozone, hydrogen peroxide, chlorite, chlorine dioxide, permanganate, nitrite, some metal ions (Fe(III), Cu(II), Mn(III)), etc.

Quality and reporting: Includes calculation formulae (conversion to mg/L using molar mass 70.91 g/mol), repeatability data, and mandatory test-report items (reference to standard, sample ID, results, deviations from procedure).

Applications

Routine water quality testing in drinking-water treatment plants and distribution systems.

Environmental monitoring of surface waters and effluents where total chlorine must be quantified.

Process control for water disinfection and verification of residual chlorine (free + combined).

Laboratories performing regulatory compliance testing, QA/QC checks, and method validation.

Related standards

ISO 7393-1 (titrimetric method using DPD reagent)

ISO 7393-2 (colorimetric DPD method for routine control)

ISO 5667-1 and ISO 5667-2 (sampling guidance)

Keywords: water quality, EN ISO 7393-3:2000, iodometric titration, total chlorine determination, free chlorine, chloramines, drinking water testing, chlorine analysis, water analysis standards.

SIST EN ISO 7393-3:2000 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

Технические детали

ISO 7393-3:1990

Water quality — Determination of free chlorine and total chlorine — Part 3: Iodometric titration method for t…

SIST EN ISO 5667-1:2023

Water quality - Sampling - Part 1: Guidance on the design of sampling programmes and sampling techniques (ISO…

BS ISO 5667-21:2010

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

SIST EN ISO 7393-1:2000

Water quality - Determination of free chlorine and total chlorine - Part 1: Titrimetric method using N, N-die…

SIST EN ISO 7393-2:2018

Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-dia…