BS EN ISO 5809-1994 (2000) PDF

Full title and description

STB BS EN ISO 5809-1994 (2000) — Starches and derived products. Determination of sulphated ash. This document is the European/British adoption of ISO 5809 (method for determination of sulphated ash in starches and derived products) as published under the BS EN ISO designation.

Abstract

This standard specifies a gravimetric method for determining the sulphated (sulphated) ash content of starches and starch-derived products. The technique requires treating a test portion with sulphuric acid and incinerating under defined conditions, then expressing the residue as a percentage by mass (either as received or on a dry basis). The ISO original is brief (core procedure), and the EN/BS adoption contains the national publication metadata.

General information

• Status: Published / national adoption (BS EN ISO 5809:1994).
• Publication date: BS EN ISO 5809 published 15 December 1994 (original ISO 5809 published 1 December 1982).
• Publisher: British Standards Institution (BSI) for the BS edition; International Organization for Standardization (ISO) for the original.
• ICS / categories: 67.180.20 — Starch and derived products.
• Edition / version: BS EN ISO 5809:1994 — adoption of ISO 5809:1982 (EN/BS edition published 1994; some national adoptions and confirmations occurred around 1999–2001 and in 2000 in some countries).
• Number of pages: BS EN ISO 5809 (BS edition) typically listed as 12 pages; the original ISO 5809:1982 main text is 3 pages (ISO core method).

Scope

The standard applies to starches and derived products and specifies a procedure for determining sulphated ash by incineration of a test portion in the presence of sulphuric acid at prescribed temperature conditions; results are reported as mass percentage either on an 'as received' basis or on a dry-matter basis. It is intended for samples where the sulphated-ash procedure (acidified ignition) is the appropriate ash-determination technique (for example, when particular sample chemistries make simple incineration unsuitable).

Key topics and requirements

• Definition of test portion size and sample conditioning (drying / representative sampling).
• Use of sulphuric acid pretreatment prior to incineration to convert residues to a stable sulphated ash form.
• Controlled incineration temperature and time (specified temperature tolerance and ignition procedure) and handling of residue.
• Gravimetric determination: cooling and weighing of ash, blank corrections and calculation of percentage sulphated ash (as received or dry basis).
• Requirements for reagents, crucibles / boats, muffle furnace, and laboratory safety when using concentrated sulphuric acid and high-temperature furnaces.

Typical use and users

Quality-control and analytical laboratories in the starch and food-ingredient industries, manufacturers of native or modified starches, regulatory and inspection laboratories, and standards bodies use this method to quantify mineral residue expressed as sulphated ash. It is most relevant where precise ash characterization is needed for product specification, labeling, incoming material acceptance and regulatory compliance.

Related standards

ISO 5809 is part of the body of ISO/CEN standards addressing analytical methods for starch and derived products. Closely related publications include ISO 3593 (Starch — Determination of ash) — ISO 3593 is the general ash-determination method for starches and indicates ISO 5809 should be used in cases requiring the sulphated-ash procedure. Various EN/ national adoptions (EN ISO 5809, LST EN ISO 5809:2000, BDS EN ISO 5809, etc.) reflect the same core method adopted nationally.

Keywords

Starch; derived products; sulphated ash; sulphated ash determination; ash determination; gravimetric method; BS EN ISO 5809; ISO 5809; food analysis; quality control.

FAQ

Q: What is this standard?

A: It is the method standard titled "Starches and derived products — Determination of sulphated ash" adopted as BS EN ISO 5809:1994 (original ISO 5809:1982). It specifies a sulphated-ash gravimetric procedure for starch materials.

Q: What does it cover?

A: It covers sample treatment with sulphuric acid, controlled incineration and gravimetric weighing of the resultant sulphated ash, with expression of results as a percentage by mass (as received or on dry basis). The procedure is intended for starches and derived products where this acidified ash method is appropriate.

Q: Who typically uses it?

A: Analytical and quality-control laboratories in the starch and food-ingredients industry, manufacturers of starch products, regulatory laboratories and standards/inspection bodies. Laboratories use it when product specifications or regulatory methods call for sulphated-ash values.

Q: Is it current or superseded?

A: The original ISO 5809:1982 text remains the core international method and has been adopted as EN/BS editions (BS EN ISO 5809:1994). National adoptions and confirmations have appeared in subsequent years; users should check their national standards body for the latest confirmation or withdrawal status before purchase or citation. (ISO metadata show the 1982 text as the published core method and EN/BS adoption published in 1994.)

Q: Is it part of a series?

A: Yes — it belongs to the ISO/CEN suite of standards on starch and derived products under ISO/TC 93 and is related to other ash and compositional analysis standards such as ISO 3593 (general ash determination) and other ISO methods for starch analysis.

Q: What are the key keywords?

A: Starch; sulphated ash; ash determination; gravimetric analysis; BS EN ISO 5809; ISO 5809; food analysis; quality control.