SIST EN ISO 5809:1998

Starches and derived products - Determination of sulphated ash

Incineration of a test portion, in the presence of sulphuric acid, at a temperature of 525 25 °C. The result is expressed as a percentage by mass either of the product as received or on dry basis.

Stärke und Stärkederivate - Bestimmung der Sulfatasche

Diese internationale Norm legt ein Verfahren zur Bestimmung der Sulfatasche in Stärke und Stärkederivaten fest.

Amidons, fécules et produits dérivés - Détermination des cendres sulfatées

La présente Norme internationale spécifie une méthode de détermination des cendres sulfatées dans les amidons, fécules et leurs produits dérivés.

Škrob in škrobni derivati - Določevanje sulfatnega pepela

General Information

• Status: Published
• Publication Date: 31-Oct-1998
• ICS: 67.180.20 - Starch and derived products
• Technical Committee: KŽP - Agricultural food products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1998
• Due Date: 01-Nov-1998
• Completion Date: 01-Nov-1998
• Ref Project: EN ISO 5809:1994 - Starches and derived products - Determination of sulphated ash

Overview

SIST EN ISO 5809:1998 is an internationally recognized standard developed by the International Organization for Standardization (ISO) and adopted by CEN. It specifies a precise method for the determination of sulphated ash content in starches and their derived products. The procedure involves incinerating a test portion of the product in the presence of sulphuric acid at a controlled temperature of 525 ± 25 °C. The resulting residue, called sulphated ash, is expressed as a percentage by mass either on the product as received or on a dry basis.

This standard is essential for quality control and chemical analysis in industries handling starch-based materials, ensuring consistency, safety, and compliance with regulatory requirements.

Key Topics

• Scope and Application
  The method applies to starches and starch-derived products, providing a reliable measure of their inorganic residue following incineration.

• Principle
  Sulphuric acid facilitates the conversion of volatile chlorides into non-volatile sulphates during incineration, preventing losses and ensuring accurate ash content measurement.

• Reagents and Apparatus

  • Sulphuric acid solution and hydrochloric acid solution of specified concentrations
  • Incineration dish made of platinum or inert material
  • Electric furnace with precise temperature control
  • Analytical balance, desiccator, water bath, and other laboratory apparatus

• Procedure

  • Careful preparation and cleaning of the incineration dish
  • Mixing and preparation of the test sample, including dissolution or melting if necessary
  • Addition of sulphuric acid and controlled incineration until carbon residue disappears
  • Cooling, weighing, and calculation of sulphated ash content

• Calculation and Expression of Results
  The sulphated ash content is calculated as a percentage by mass, using established formulae that take into account sample mass, moisture content, and residue mass. Results are reported to two decimal places with guidelines for repeatability and reproducibility to ensure accuracy.

Applications

SIST EN ISO 5809:1998 is widely utilized in:

• Food Industry
  Monitoring and controlling the quality of starches used as food ingredients and additives.

• Pharmaceutical Industry
  Ensuring purity and consistency of starch excipients in medications.

• Chemical and Bioproducts Manufacturing
  Assessing the inorganic content in starch-derived chemicals, syrups, and bio-based materials.

• Quality Control Laboratories
  Routine analysis to comply with regulatory standards and product specifications.

By accurately quantifying sulphated ash, manufacturers can maintain product quality, optimize production processes, and verify compliance with international quality standards.

Related Standards

• ISO 1666 – Determination of moisture content in starches by drying methods
• ISO 1741 – Loss in mass on drying for dextrose
• ISO 1742 – Determination of dry matter in glucose syrups via vacuum oven method
• ISO 1743 – Refractive index method for dry matter in glucose syrups

These related standards complement EN ISO 5809 by providing comprehensive testing protocols for starch and derivative products, covering moisture and dry matter analysis crucial for accurate sulphated ash determination.

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Keywords: EN ISO 5809, sulphated ash determination, starch analysis, incineration method, sulphuric acid, starch quality control, starch derivatives, CEN standard, analytical method, inorganic residue, food industry testing, pharmaceutical starch analysis, moisture content in starch, chemical analysis standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-1998
âNURELQãNUREQLGHULYDWL'RORþHYDQMHVXOIDWQHJDSHSHOD
Starches and derived products - Determination of sulphated ash
Stärke und Stärkederivate - Bestimmung der Sulfatasche
Amidons, fécules et produits dérivés - Détermination des cendres sulfatées
Ta slovenski standard je istoveten z: EN ISO 5809:1994
ICS:
67.180.20 Škrob in izdelki iz njega Starch and derived products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEXAYHAPO~HAR OPrAHM3ALWlR fl0 CTAHAAPTM3AlUlM~RGANISATION INTERNATIONALE DE NORMALISATION
Starches and derived products - Determination of
sulphated ash
Arnidons, fhcules et produits d&iv6s -
06 termina tion des cendres sulfa tees
First edition - 1982-12-01
UDC 664.2: 543.822
Ref. No. ISO 58094982 (E)
Descriptors :
starches, Chemical analysis, determination of sulphated ash.
Price based on 3 pages
oreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bedies). The work of developing Inter-
national Standards is carried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 5809 was developed by Technical Committee lSO/TC 93,
Starch fincluding derivatives and by-productsl, and was circulated to the member
bodies in February 1982.
lt has been approved by the member bodies of the following countries :
Austria
Netherlands South Africa, Rep. of
Egypt, Arab Rep. of Poland USA
France Portugal USSR
Germany, F. R. Romania
No member body expressed disapproval of the document.
International Organkation for Standardkation, 1982
Printed in Switzerland
INTERNATIONAL STANDARD ISO 5809-1982 (E)
Starches and derived products - Determination of
sulphated ash
5. l Sulphuric acid solution.
1 Scope and field of application
This International Standard specifies a method for the deter- Add, carefully, 100 ml of concentrated sulphuric acid,
mination of sulphated ash in starches and derived products. e20 1,83 g/ml, to 300 ml of water and mix.
5.2 Hydrochlorit acid soiution.
2 References
Add, carefully, 100 ml of concentrated hydrochloric acid,
Determination of moisture content -
ISO 1666, Star& - e20 1,19 g/ml, to 500 ml of water and mix.
@en-drying methods. 1)
- Determination of Ioss in mass on drying
ISO 1741, Dextrose 6 Apparatus
- Vacuum oven method.
Ordinary laboratory apparatus, and in particular
ISO 1742, Glucose syrups - Determination of dry matter -
Vacuum oven method.
6.1 Incineration dish, of platinum or any other material
which does not deteriorate under the test conditions (for exam-
Determination o f dry matter --
ISO 1743, Glucose syrup - ple a silica incineration dish), of capacity 100 to 200 ml and with
Refractive index method.
a minimum useful surface of 15 cm2.
6.2 Electric furnace with air circulation, capable of being
3 Definition
controlled at 525 tr 25 OC.
sulphated ash: The residue obtained after incineration of the
6.3 Electric hot-plate or gas burner or heating lamp.
product, according to the method specified in this International
Standard.
6.4 Desiccator, provided with an efficient desiccant.
lt is expressed as a percentage by mass either of the product as-
6.5 Water bath, capable of being controlled at 60 to 70 OC.
received or on the dry basis.
6.6 Analytical balance.
4 Principle
Incineration of a test Portion, in the presence of sulphuric acid, 7 Procedure
at a temperature of 525 k 25 OC.
7.1 Preparation of the incineration dish
The sulphuric acid facilitates the destruction of the organic
matter and avoids losses by converting the volatile chlorides Clean the incineration dish (6.1), whether it is new or used,
with boiling hydrochloric acid Solution (5.2), then rinse
into non-volatile sulphates.
generously with water.
Calcinate the incineration dish for 30 min in the furnace (6.21,
5 Reagents
controlled at 525 k 25 OC. Allow to cool to ambient
During the analysis, use only reagents of recognized analytical temperature in the desiccator (6.4) and weigh to the nearest
quality and only distilled water or water of at least equivalent 0,000 2 g (the incineration dish should be calcinated to con-
purity. stant mass).
1) Under revision.
ISO 5809-1982 (E)
the electric hot-plate or gas burner or using the he
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