SIST EN ISO 3946:1998 PDF

Name: SIST EN ISO 3946:1998 — Starches and derived products - Determination of total phosphorus content - Spectrophotometric method (ISO 3946:1982)
SKU: SIST EN ISO 3946:1998
Price: 43.71 EUR
Availability: InStock

Starches and derived products - Determination of total phosphorus content - Spectrophotometric method (ISO 3946:1982)

Название (английский):

SIST EN ISO 3946:1998

Starches and derived products - Determination of total phosphorus content - Spectrophotometric method (ISO 3946:1982)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 ноября 1998 г.
ICS:: 67.180.20
Технический комитет:: KŽP - Agricultural food products

Тип поставки:

Full version75 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 раб. дн. (перевод)

Цена:75 €

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

Похожие стандарты

Упомянутые в описании и другие стандарты SIST

Overview

SIST EN ISO 3946:1998 specifies a spectrophotometric method for the determination of the total phosphorus content in starches and derived products. Applicable to samples containing phosphorus up to 5% by mass, this international standard outlines a precise analytical procedure widely used in laboratories to ensure quality control and compliance in starch processing industries. The method involves the digestion of organic substances followed by the formation and measurement of phosphomolybdate complexes, which produce a characteristic blue color measurable at 825 nm wavelength.

Key Topics

Scope and Applicability: The standard is designed for starches, their derivatives, and related by-products, focusing on total phosphorus content expressed as mass percentage (m/m) not exceeding 5%.

Analytical Principle:

Destruction of organic substances through digestion with a sulpho-nitric acid mixture.
Conversion of all phosphate compounds to orthophosphates.
Formation of a phosphomolybdate complex, which is reduced to molybdenum blue.
Measurement of the intensity of the blue color at 825 nm using a spectrophotometer to quantify phosphorus concentration.

Reagents and Solutions:

Sulpho-nitric reagent (sulfuric acid + nitric acid).
Ammonium molybdate solution.
Ascorbic acid as a reducing agent.
Standard solutions prepared from potassium dihydrogenorthophosphate for calibration.

Equipment Requirements: Standard laboratory apparatus, including volumetric flasks, pipettes, and spectrophotometers capable of readings at 825 nm wavelength, adhering to ISO 1042 specifications for volumetric glassware.

Calculation and Repeatability:

Results expressed as a percentage of phosphorus by mass.
Protocol includes detailed formulas for calculating phosphorus content from absorbance values.
Method emphasizes repeatability criteria, ensuring accuracy with a maximum allowable difference of ±2% for phosphorus contents above 0.2%.

Applications

This spectrophotometric method provided by SIST EN ISO 3946:1998 is critical for:

Quality Control: Ensuring consistent phosphorus content in starch production, which affects functional properties and regulatory compliance.

Research and Development: Formulating starch derivatives and blended products with precise phosphorus levels.

Regulatory Testing: Meeting international standards for food additives and industrial starch products.

Industrial Processing: Monitoring raw materials and final products in starch manufacturing to optimize processing parameters.

The method is particularly suited for analytical laboratories involved in starch chemistry and related food and industrial applications where accurate phosphorus quantification is essential.

Related Standards

ISO 1042 – Laboratory glassware: volumetric flasks.

EN ISO 9001 – Quality Management Systems applicable for laboratories following standardized testing procedures.

Other relevant ISO standards in food chemistry and phosphorus determination methods.

By adhering to SIST EN ISO 3946:1998, organizations ensure reliable phosphorus content measurement aligned with international best practices, facilitating compliance and enhancing product quality across starch and derivative product industries.

SIST EN ISO 3946:1998 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

BS EN ISO 10427-1:2024

Oil and gas industries including lower carbon energy. Equipment for well cementing. Casing bow-spring central…

ISO 19443:2018/Amd 1:2024

Quality management systems — Specific requirements for the application of ISO 9001:2015 by organizations in t…

SIST EN ISO 6338:2026

Method to calculate GHG emissions at LNG plant (ISO 6338:2023)

SIST-TP CEN ISO/ASTM TR 52958:2026

Additive manufacturing of metals - Powder bed fusion (PBF) - In-situ coaxial photodiode monitoring for lack o…

SIST EN ISO 41002:2026

Facility management - Development of the facility management organization (ISO 41002:2026)

SIST EN ISO 844:2026

Rigid cellular plastics - Determination of compressive properties (ISO 844:2026)

SIST-TS CEN ISO/TS 17664-3:2026

Processing of health care products - Information to be provided by the medical device manufacturer for the pr…

SIST EN ISO 8980-4:2026

Ophthalmic optics - Uncut finished spectacle lenses - Part 4: Specifications and test methods for the propert…