ISO 5400-1984 PDF

Full title and description

ISO 5400:1984 — Leather — Determination of total silicon content — Reduced molybdosilicate spectrometric method. This International Standard specifies a chemical analytical procedure for quantifying total silicon in leather by oxidizing the test portion, forming a molybdosilicate complex and measuring its absorbance spectrometrically.

Abstract

The standard describes sample oxidation (commonly in a Parr bomb under alkaline conditions) to destroy organic matter and solubilize mineral constituents, followed by formation of a molybdosilicate complex which is reduced and measured by spectrophotometry (measurement typically at about 630 nm) to determine total silicon content in leather samples.

General information

• Status: Published (confirmed in ISO periodic review).
• Publication date: 1984 (Edition 1 — February 1984).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.140.30 (Leather and furs).
• Edition / version: Edition 1 (1984).
• Number of pages: 2.

Scope

This standard specifies a laboratory method for the determination of total silicon in leather materials. It is intended for use where a reliable quantitative measurement of silicon (from additives, contaminants or fillers) is required for quality control, specification compliance or research. The method covers sample preparation, digestion/oxidation, reagent preparation, formation and reduction of the molybdosilicate complex and spectrometric measurement and calculation of results.

Key topics and requirements

• Sample preparation: grinding/representative sampling and conditioning of leather samples.
• Oxidation/digestion: alkaline oxidation (e.g., in a Parr bomb) to destroy organic matrix and solubilize silicon-bearing mineral matter.
• Reaction chemistry: formation of a molybdosilicate complex and its controlled reduction prior to measurement.
• Spectrometric measurement: photometric determination (commonly at ~630 nm) and use of calibration for quantification.
• Expression of results: calculation and reporting of total silicon content according to the method’s formulae and units.
• Laboratory safety and reagent specifications: use of specified reagents, control samples and appropriate safety precautions for oxidation/digestion steps.

Typical use and users

Analytical and quality-control laboratories serving tanneries and leather manufacturers, research institutions studying leather composition, regulatory and certification bodies assessing contaminant or filler levels, and material scientists investigating leather additives or processing effects.

Related standards

ISO 5400:1984 is part of the suite of ISO/IULTCS leather chemical-analysis methods. National equivalents/identical adoptions include UNE 59027:1988 (Spain) which is listed as identical to ISO 5400:1984. Related ISO test methods for leather preparation and analysis (sampling, grinding, ash, pH, nitrogen, etc.) include standards such as ISO 2418 (sampling), ISO 4044 (preparation/grinding), ISO 4047 (total ash) and other IULTCS/ISO chemical-analysis methods used alongside ISO 5400.

Keywords

ISO 5400; leather; silicon; total silicon content; molybdosilicate; spectrometric method; Parr bomb; digestion; chemical analysis; IULTCS.

FAQ

Q: What is this standard?

A: ISO 5400:1984 is an International Standard that specifies a reduced molybdosilicate spectrometric method for determining total silicon content in leather samples.

Q: What does it cover?

A: It covers sample oxidation/digestion, formation and reduction of a molybdosilicate complex, spectrometric measurement (around 630 nm) and calculation/reporting of total silicon in leather.

Q: Who typically uses it?

A: Leather testing and quality-control laboratories, tanneries, research laboratories, and authorities or certification bodies that need quantitative silicon determinations in leather.

Q: Is it current or superseded?

A: The 1984 edition is the published edition; the ISO bibliographic record indicates the publication and its confirmation status from periodic ISO review (the ISO record shows the 1984 edition and confirmation activity in ISO’s review process). Users should check with their national standards body or ISO for the absolute current status before purchase or formal citation.

Q: Is it part of a series?

A: Yes — ISO 5400 forms part of the ISO/IULTCS suite of leather chemical-analysis and testing methods; it is referenced alongside other ISO leather test methods used for comprehensive leather characterization.

Q: What are the key keywords?

A: Leather, silicon, molybdosilicate, spectrometric determination, digestion, Parr bomb, chemical analysis, ISO 5400:1984.