ISO 2829:1973 PDF

Aluminium oxide primarily used for the production of aluminium — Determination of phosphorus content — Reduced phosphomolybdate spectrophotometric method

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Title (English):

ISO 2829:1973

Aluminium oxide primarily used for the production of aluminium — Determination of phosphorus content — Reduced phosphomolybdate spectrophotometric method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 3
Publication date:: December 1, 1973
Edition:: ISO IS 2829 edition 1 version 1
ICS:: 71.100.10

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Description (English):

Applicable to products having phosphorus contents of more than 0.0005 % (m/m). Preparation of a solution from a test portion by alkaline fusion either with a mixture of sodium carbonate and borid or of sodium carbonate and sodium tetraborate. Dissolution of the cooled molten mass in nitric acid and adjustment of an appropriate aliquot portion to pH 2. Formation of a phosphomolybdic complex and extraction by 2-methylpropan-1-ol in a sulphuric acid medium. Reduction of the complex by thin(II) chloride in the organic phase and spectrophotometric measurement of the reduced complex at a wavelength of about 730 nm. Has also been approved by the IUPAC.

Technical details

Technical committee: ISO/TC 226 - Materials for the production of primary aluminium
SKU: ISO 2829:1973

Abstract

Overview

ISO 2829:1973 specifies a spectrophotometric method for the determination of phosphorus content in aluminium oxide (alumina) used for aluminium production. The method - also approved by IUPAC - is applicable to products with phosphorus contents greater than 0.0005 % (m/m). It uses alkaline fusion to prepare the sample, formation of a phosphomolybdic complex, solvent extraction, reduction to a coloured species, and spectrophotometric measurement near 730 nm.

Key Topics and Requirements

Scope and sensitivity
- Applicable to alumina samples with P > 0.0005 % (m/m).
Sample preparation
- Preparation of a solution from a test portion by alkaline fusion: either with a mixture of sodium carbonate and borid (as stated in the original text) or with sodium carbonate and sodium tetraborate.
- Dissolution of the cooled molten mass in nitric acid.
- Adjustment of an appropriate aliquot to pH 2 before complex formation.
Complex formation and extraction
- Formation of a phosphomolybdic complex in an acid medium (sulphuric acid).
- Extraction of the complex into 2‑methylpropan‑1‑ol (isobutanol) as the organic phase.
Reduction and measurement
- Reduction of the extracted complex by tin(II) chloride in the organic phase to produce the reduced phosphomolybdate chromophore.
- Spectrophotometric measurement of the reduced complex at a wavelength of about 730 nm for quantification.
Quality control
- Use of appropriate aliquots, blanks, and calibration standards is implied for accurate quantitation (users should follow good laboratory practice for calibration and QC).

Applications and Who Uses It

Alumina and aluminium producers - quality control of feedstock to control phosphorus levels that can affect smelting and metal quality.
Analytical and metallurgical laboratories - routine and reference analyses for phosphorus in alumina samples.
Standards organizations and testing laboratories - method reference for method validation and inter-laboratory comparisons.
Reagent and instrument suppliers - supplying appropriate chemicals (e.g., tin(II) chloride, extraction solvents) and spectrophotometers optimized for ~730 nm measurements.

Practical value: the method provides a sensitive, IUPAC-approved route to quantify trace phosphorus in alumina, supporting product specification compliance and process control in aluminium production.

Related Standards

ISO 2829:1973 is an established reference for phosphorus analysis in alumina and is cross-referenced by laboratories using spectrophotometric phosphomolybdate chemistry. Users often consult complementary ISO methods for other impurity determinations in aluminium oxide and general laboratory quality standards.

Related standards

Other ISO standards

Abstract

Overview

Key Topics and Requirements

Scope and sensitivity
- Applicable to alumina samples with P > 0.0005 % (m/m).
Sample preparation
- Preparation of a solution from a test portion by alkaline fusion: either with a mixture of sodium carbonate and borid (as stated in the original text) or with sodium carbonate and sodium tetraborate.
- Dissolution of the cooled molten mass in nitric acid.
- Adjustment of an appropriate aliquot to pH 2 before complex formation.
Complex formation and extraction
- Formation of a phosphomolybdic complex in an acid medium (sulphuric acid).
- Extraction of the complex into 2‑methylpropan‑1‑ol (isobutanol) as the organic phase.
Reduction and measurement
- Reduction of the extracted complex by tin(II) chloride in the organic phase to produce the reduced phosphomolybdate chromophore.
- Spectrophotometric measurement of the reduced complex at a wavelength of about 730 nm for quantification.
Quality control
- Use of appropriate aliquots, blanks, and calibration standards is implied for accurate quantitation (users should follow good laboratory practice for calibration and QC).

Applications and Who Uses It

Alumina and aluminium producers - quality control of feedstock to control phosphorus levels that can affect smelting and metal quality.
Analytical and metallurgical laboratories - routine and reference analyses for phosphorus in alumina samples.
Standards organizations and testing laboratories - method reference for method validation and inter-laboratory comparisons.
Reagent and instrument suppliers - supplying appropriate chemicals (e.g., tin(II) chloride, extraction solvents) and spectrophotometers optimized for ~730 nm measurements.

Related Standards

ISO 2829:1973 is an established reference for phosphorus analysis in alumina and is cross-referenced by laboratories using spectrophotometric phosphomolybdate chemistry. Users often consult complementary ISO methods for other impurity determinations in aluminium oxide and general laboratory quality standards.

ISO 2829:1973 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Applications and Who Uses It

Related Standards

Related standards

Abstract

Overview

Key Topics and Requirements

Applications and Who Uses It

Related Standards

Related standards

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