ISO 2482:1973 PDF

Sodium chloride for industrial use — Determination of calcium and magnesium contents — EDTA complexometric methods

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Title (English):

ISO 2482:1973

Sodium chloride for industrial use — Determination of calcium and magnesium contents — EDTA complexometric methods

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 3
Publication date:: February 1, 1973
Edition:: ISO IS 2482 edition 1 version 1
ICS:: 71.060.50

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Description (English):

The method is applicable to water-soluble salts for contents greater than 0,001 % (m/m). In a special case, the determination of ions in a principal solution prepared in an acid medium is pooible. The principle consists in dissolution of a test portion and separation of insoluble matter. Titration of the filtrate obtained according to ISO 2479 using disodium ethylendiamintetraacetate (EDTA) in the presence of glyoxal-bis-(2-hydroxyanil) (GBHA) and mordant black 11 (Cl 14645) respectively as indicators.

Technical details

Technical committee: ISO/TC 47 - Chemistry
SKU: ISO 2482:1973

Abstract

Overview

ISO 2482:1973 is an International Standard developed by the International Organization for Standardization (ISO) that specifies complexometric titration methods for determining calcium and magnesium contents in sodium chloride for industrial use. Utilizing EDTA (ethylenediaminetetraacetic acid) as the titrant and specific colorimetric indicators, this standard addresses accurate quantification of water-soluble calcium and magnesium ions, essential for quality control in industrial salt applications. The method applies to calcium and magnesium concentrations above 0.001% by mass and can be adapted for samples prepared in acidic media.

Key Topics

Scope and Application
- Applicable to sodium chloride for industrial use containing calcium and magnesium ions exceeding 0.001% (m/m).
- Supports testing in both neutral and acidic sample preparations.
- Governs water-soluble salt analysis, focusing on calcium and magnesium contaminants.
Principle of Method
- Dissolution of the test sample and separation of insoluble matter.
- Volumetric titration of filtrate with disodium EDTA standard solutions.
- Use of glyoxal-bis-(2-hydroxyanil) (GBHA) and mordant black 11 as indicators for calcium and magnesium endpoint detection.
- pH-adjusted titration ensuring reliable complexometric reaction.
Reagents and Apparatus
- Standardized sodium hydroxide, ethanol, triethanolamine, and buffer solutions to maintain optimal pH.
- Preparation of 0.02 M and 0.002 M EDTA standard solutions for titration sensitivity.
- Ordinary laboratory glassware and titrators.
Detailed Procedure
- Specific steps for calcium determination including sample preparation, pH adjustment (>12), and titration endpoint identification (red to yellow color change).
- Total calcium plus magnesium assessment in heated samples with buffer addition and color change from wine red to blue indicating endpoint.
- Special provisions for samples prepared in acid medium, maintaining consistent testing conditions.
Calculation and Expression of Results
- Formulas for calculating calcium and magnesium percentages based on titrant volume, sample mass, and molar masses.
- Recommendations for repeat tests and statistical repeatability data from inter-laboratory tests to ensure reliability.

Applications

Industrial Sodium Chloride Quality Control Ensures compliance with purity specifications by detecting calcium and magnesium impurities that can affect salt quality, processing, and end-use performance.
Chemical and Pharmaceutical Industries Provides a standardized analytical technique for salt manufacturers aiming to control contaminant levels critical for chemical reactions and pharmaceutical formulations.
Water Treatment and Environmental Monitoring Enables quality assessment of sodium chloride used in water conditioning, ensuring that calcium and magnesium concentrations meet required thresholds.
Research and Development Offers a reliable method to quantify calcium and magnesium ions in experimental sodium chloride samples, facilitating product formulation and process optimization.

Related Standards

ISO 2479:1973 Specifies determination of insoluble matter in water or acid and preparation of principal solutions, referenced for sample preparation in ISO 2482.
ISO 9001 Series Quality management guidelines supporting analytical and testing laboratories in maintaining process control and result accuracy.
ISO/IEC 17025 Specifies general requirements for the competence of testing and calibration laboratories performing procedures like those in ISO 2482.
ASTM E1209 - 17 Standard test method for calcium, magnesium, and iron in salt by EDTA titration, which complements ISO 2482 procedures in similar contexts.

Keywords: ISO 2482, sodium chloride analysis, calcium determination, magnesium content, EDTA complexometric method, industrial salt purity, chemical analysis, volumetric titration, GBHA indicator, mordant black 11, quality control sodium chloride, water-soluble ions detection.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

Scope and Application
- Applicable to sodium chloride for industrial use containing calcium and magnesium ions exceeding 0.001% (m/m).
- Supports testing in both neutral and acidic sample preparations.
- Governs water-soluble salt analysis, focusing on calcium and magnesium contaminants.
Principle of Method
- Dissolution of the test sample and separation of insoluble matter.
- Volumetric titration of filtrate with disodium EDTA standard solutions.
- Use of glyoxal-bis-(2-hydroxyanil) (GBHA) and mordant black 11 as indicators for calcium and magnesium endpoint detection.
- pH-adjusted titration ensuring reliable complexometric reaction.
Reagents and Apparatus
- Standardized sodium hydroxide, ethanol, triethanolamine, and buffer solutions to maintain optimal pH.
- Preparation of 0.02 M and 0.002 M EDTA standard solutions for titration sensitivity.
- Ordinary laboratory glassware and titrators.
Detailed Procedure
- Specific steps for calcium determination including sample preparation, pH adjustment (>12), and titration endpoint identification (red to yellow color change).
- Total calcium plus magnesium assessment in heated samples with buffer addition and color change from wine red to blue indicating endpoint.
- Special provisions for samples prepared in acid medium, maintaining consistent testing conditions.
Calculation and Expression of Results
- Formulas for calculating calcium and magnesium percentages based on titrant volume, sample mass, and molar masses.
- Recommendations for repeat tests and statistical repeatability data from inter-laboratory tests to ensure reliability.

Applications

Industrial Sodium Chloride Quality Control Ensures compliance with purity specifications by detecting calcium and magnesium impurities that can affect salt quality, processing, and end-use performance.
Chemical and Pharmaceutical Industries Provides a standardized analytical technique for salt manufacturers aiming to control contaminant levels critical for chemical reactions and pharmaceutical formulations.
Water Treatment and Environmental Monitoring Enables quality assessment of sodium chloride used in water conditioning, ensuring that calcium and magnesium concentrations meet required thresholds.
Research and Development Offers a reliable method to quantify calcium and magnesium ions in experimental sodium chloride samples, facilitating product formulation and process optimization.

Related Standards

ISO 2479:1973 Specifies determination of insoluble matter in water or acid and preparation of principal solutions, referenced for sample preparation in ISO 2482.
ISO 9001 Series Quality management guidelines supporting analytical and testing laboratories in maintaining process control and result accuracy.
ISO/IEC 17025 Specifies general requirements for the competence of testing and calibration laboratories performing procedures like those in ISO 2482.
ASTM E1209 - 17 Standard test method for calcium, magnesium, and iron in salt by EDTA titration, which complements ISO 2482 procedures in similar contexts.

ISO 2482:1973 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

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