EN ISO 3188:1994 PDF
Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978)
Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 25 августа 1994 г.
- Издание:
- CEN EN 3188 edition 1 version 1
- ICS:
- 67.180.20
The found value only includes free amino acids, compounds producing amino acids on hydrolysis and ammonium compounds. The principle consists in destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, distillation of the liberated ammonia and collection in a boric acid solution, followed by titration with a standard volumetric sulphuric acid solution. The method applies to contents greater than 0,01 % (m/m). For products with contents less than 0,025 % (m/m), see ISO 5378.
Abstract
Overview
EN ISO 3188:1994 (ISO 3188:1978) specifies a titrimetric Kjeldahl method for determining the nitrogen content of starches and derived products. The method is intended for materials with a presumed nitrogen content greater than 0.01% (m/m). It covers destruction of organic matter by sulphuric acid with a compound catalyst, alkalization, distillation of liberated ammonia into boric acid and titration with a standard volumetric sulphuric acid solution. Results include free amino acids, compounds yielding amino acids on hydrolysis and ammonium compounds; nitrate/nitrite and nitrogen bound to oxygen or directly to another nitrogen atom are excluded.
Key topics and technical requirements
- Scope and applicability
- For starches and derivatives with nitrogen > 0.01% (m/m). For very low levels (
Технические детали
- Технический комитет
- CEN/SS C10 - Starch
- SKU
- EN ISO 3188:1994
Похожие стандарты
Упомянутые в описании и другие стандарты EN
ISO 3188:1978
ДействующийStarches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetric method
Overview ISO 3188:1978 is an international standard established by the International Organization for Standardization (ISO) that specifies a titrimetric method for determining the nitrogen content in…
EN ISO 6599-1:2026
ДействующийPackaging - Conditioning for testing - Part 1: Paper sacks (ISO 6599-1:2026)
Overview EN ISO 6599-1:2026 - Packaging - Conditioning for testing - Part 1: Paper sacks is a key international standard developed by CEN and ISO. This document defines the conditioning atmospheres a…
EN ISO 4885:2026
ДействующийFerrous materials - Heat treatments - Vocabulary (ISO 4885:2026)
Overview EN ISO 4885:2026 - Ferrous Materials – Heat Treatments – Vocabulary is an international standard developed by CEN, aligning with ISO 4885:2026. This document provides comprehensive definitio…
EN ISO/IEC 29151:2026
ДействующийInformation security, cybersecurity and privacy protection - Controls, requirements, and guidance for persona…
Overview EN ISO/IEC 29151:2026 specifies controls, requirements, and guidance to ensure the proper protection of personally identifiable information (PII) within the fields of information security, c…
EN ISO 9693:2026
ДействующийDentistry - Compatibility testing for metal-ceramic and ceramic-ceramic systems (ISO 9693:2026)
Overview EN ISO 9693:2026 - Dentistry: Compatibility Testing for Metal-Ceramic and Ceramic-Ceramic Systems establishes internationally recognized requirements and test methods for evaluating the ther…
EN ISO 26082-1:2026
ДействующийLeather - Physical and mechanical test methods for the determination of soiling - Part 1: Rubbing (Martindale…
Overview EN ISO 26082-1:2026 is a European standard titled "Leather - Physical and mechanical test methods for the determination of soiling - Part 1: Rubbing (Martindale) method" adopted by CEN. This…
EN ISO/IEEE 11073-10101:2020/A1:2026
ДействующийHealth informatics - Device interoperability - Part 10101: Point-of-care medical device communication - Nomen…
Overview EN ISO/IEEE 11073-10101:2020/A1:2026 is an amendment to the internationally recognized standard for health informatics and device interoperability, focusing specifically on the nomenclature…
EN ISO 11609:2026
ДействующийDentistry - Dentifrices - Requirements, test methods and marking (ISO 11609:2026)
Overview EN ISO 11609:2026 – Dentistry – Dentifrices – Requirements, Test Methods and Marking (ISO 11609:2026) defines the international requirements for the physical and chemical properties, test me…