ISO 3946:1982 PDF

Name: ISO 3946:1982 — Starches and derived products — Determination of total phosphorus content — Spectrophotometric method
SKU: ISO 3946:1982
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Starches and derived products — Determination of total phosphorus content — Spectrophotometric method

Название (английский):

ISO 3946:1982

Starches and derived products — Determination of total phosphorus content — Spectrophotometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 3
Дата публикации:: 1 декабря 1982 г.
Издание:: ISO IS 3946 edition 1 version 1
ICS:: 67.180.20

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Описание (английский):

Destruction of the organic substances by digestion with a sulpho-nitric mixture and conversion of phosphates to orthophosphates. Formation of a phosphomolybdate. Measurement of the intensity of the blue colour at a wavelength of 825 nm. The method applies to contents up to 5 % (m/m).

Abstract

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Overview

ISO 3946:1982 is an international standard established by the International Organization for Standardization (ISO) for the determination of total phosphorus content in starches and derived products. This standard specifies a reliable spectrophotometric method designed to measure phosphorus content up to 5% by mass. The method involves digesting organic substances with a sulpho-nitric acid mixture, converting phosphates to orthophosphates, and then forming a colored phosphomolybdate complex measured at a wavelength of 825 nm.

This standard is essential for accurate chemical analysis, ensuring quality and compliance in industries utilizing starch and its derivatives.

Key Topics

Scope and Application ISO 3946 applies to starch, including derivatives and related by-products, providing a method for determining total phosphorus content when expected values do not exceed 5% (m/m).

Analytical Principle The organic material is destroyed by digestion with sulpho-nitric acid, converting all phosphate forms to orthophosphates. A reducing agent then transforms the orthophosphate into a phosphomolybdate complex (molybdenum blue), whose blue color intensity correlates with phosphorus concentration.

Reagents and Solutions Including sulpho-nitric reagent, nitric acid, ascorbic acid, ammonium molybdate solution, and carefully prepared standard phosphorus solutions for calibration.

Spectrophotometric Measurement The blue color formed is measured at 825 nm using a spectrophotometer to quantify phosphorus content based on absorbance.

Calculation and Reporting Results are expressed as a percentage mass of phosphorus in the test sample, with repeatability criteria ensuring result accuracy. The standard also outlines recommended test portion sizes and dilution volumes depending on expected phosphorus content.

Applications

Quality Control in Food and Starch Industries Ensuring compliance with nutritional labeling and regulatory limits for phosphorus in starch-based products.

Research and Development Useful in product formulation and modification where phosphorus content affects functional properties.

Agricultural and Environmental Analysis Monitoring phosphorus in starch raw materials to support sustainable sourcing and processing controls.

Industrial Processing Deployment in manufacturing processes where phosphorus levels influence product characteristics or equipment maintenance.

Related Standards

ISO 1042 - Laboratory glassware standards, relevant to volumetric flasks used in the method

Other ISO standards on starch analysis that cover moisture content, protein, and fat determination ensuring comprehensive quality assessment

National and international standards for chemical analysis of food and agricultural products that may complement phosphorus testing

Keywords: ISO 3946, total phosphorus determination, starch analysis, spectrophotometric method, molybdenum blue, phosphorus content, sulpho-nitric digestion, starch derivatives, chemical analysis, quality control, industrial standards.

ISO 3946:1982 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

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