ISO 9963-2:1994 PDF

Name: ISO 9963-2:1994 — Water quality — Determination of alkalinity — Part 2: Determination of carbonate alkalinity
SKU: ISO 9963-2:1994
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Water quality — Determination of alkalinity — Part 2: Determination of carbonate alkalinity

Название (английский):

ISO 9963-2:1994

Water quality — Determination of alkalinity — Part 2: Determination of carbonate alkalinity

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 10 ноября 1994 г.
Издание:: ISO IS 9963 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

Specifies a method for the titrimetric determination of carbonate alkalinity in natural and drinking water. The method is intended for samples with a carbonate alkalinity between 0,01 mmol/l and 4 mmol/l. For samples containing higher concentrations of alkalinity, a smaller test portion can be used for analysis.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 9963-2:1994 - "Water quality - Determination of alkalinity - Part 2: Determination of carbonate alkalinity" specifies a titrimetric method for measuring carbonate alkalinity in natural and drinking waters. The method targets samples with carbonate alkalinity between 0.01 mmol/L and 4 mmol/L (as H+ equivalents); for higher alkalinities a smaller test portion is used. The procedure uses acid titration with simultaneous removal of CO2 and sets the analytical endpoint at pH 5.4 to ensure full neutralization of the carbonate system and reduced interference.

Key topics and technical requirements

Principle: Titrate the sample with standardized hydrochloric acid while purging the vessel with gas free of CO2 to remove evolved CO2; endpoint chosen to neutralize the carbonate system.

Endpoint detection:

Preferred: pH‑meter set to detect pH 5.4 (stable for ≥30 s).
Alternative: mixed indicator (methyl red + bromocresol green) producing a grey/red endpoint (indicator recommended for non‑coloured samples).

Sample and test portion: Typical test portion 50.0 mL ±0.1 mL; if acid volume consumed >10 mL use smaller aliquot and dilute to 50 mL (minimum titrant consumption ≥3 mL).

Reagents and standards: Use analytically pure reagents (grade 2 water per ISO 3696). Prepare and standardize HCl (~0.020 mol/L) weekly using a sodium carbonate standard (≈0.025 mol/L).

Apparatus: burette (preferably 10 mL, 0.02 mL divisions), titration vessel with gas distribution or filter funnel, pH electrode system conforming to IEC/ISO performance requirements.

Quality control: Perform triplicate titrations; blank titrations required; report results to two significant digits. Annex A provides conversion factors (e.g., to mg/L CaCO3).

Precision: International interlaboratory data reported (typical coefficients of variation ~2–4% for various concentration ranges).

Applications and users

ISO 9963-2:1994 is used by:

Environmental and municipal water testing laboratories

Drinking water compliance and monitoring programs

Water treatment plants (process control and dosing calculations)

Research laboratories performing aquatic chemistry and alkalinity balance studies

Practical applications include routine monitoring of natural waters and tap/drinking water, process control where carbonate buffering influences pH management, and baseline data for aquatic chemistry modelling.

Related standards

ISO 9963-1:1994 - Determination of total and composite alkalinity (Part 1)

ISO 3696:1987 - Water for analytical laboratory use (grade specifications)

ISO 5667-2:1991 - Water sampling guidance

IEC 746‑2 / relevant pH electrode performance standards

Keywords: ISO 9963-2:1994, carbonate alkalinity, water quality, titrimetric determination, pH 5.4, HCl titration, alkalinity testing, drinking water analysis.

ISO 9963-2:1994 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 9963-1:1994

Water quality — Determination of alkalinity — Part 1: Determination of total and composite alkalinity

ISO 3696:1987

Water for analytical laboratory use — Specification and test methods

ISO 5667-2:1991

Water quality — Sampling — Part 2: Guidance on sampling techniques

SIST EN ISO 3696:1998

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