EN ISO 5810:1994

Starches and derived products - Determination of chloride content - Potentiometric method

A solution or suspension of the sample is titrated with a standard volumetric silver nitrate solution. The method is not applied to cationic starches and amyloids soluble when cold.

Stärke und Stärkederivate - Bestimmung des Chloridgehaltes - Potentiometrisches Verfahren

Amidons, fécules et produits dérivés - Détermination de la teneur en chlorures - Méthode potentiométrique

La présente Norme internationale spécifie une méthode potentiométrique de détermination de la teneur en chlorures des amidons, fécules et produits dérivés, à l'exception des amidons et fécules cationiques et des produits dérivés solubles à froid dont la viscosité est trop élevée pour permettre une agitation correcte lors du titrage.

Škrob in škrobni derivati - Določevanje klorida - Potenciometrijska metoda

General Information

• Status: Published
• Publication Date: 09-Sep-1994
• Withdrawal Date: 30-Mar-1995
• ICS: 67.180.20 - Starch and derived products
• Technical Committee: CEN/SS C01 - Food products
• Drafting Committee: CEN/SS C01 - Food products
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 13-Oct-1999
• Completion Date: 13-Oct-1999
• Ref Project: SIST EN ISO 5810:1998 - Starches and derived products - Determination of chloride content - Potentiometric method

Overview

EN ISO 5810:1994 specifies a potentiometric method for the determination of chloride content in starches and derived products. The method uses a standard volumetric silver nitrate (AgNO3) solution to titrate a solution or suspension of the sample while monitoring potential change. The procedure is not applicable to cationic starches and to amyloids soluble when cold, because high viscosity prevents correct stirring when titrating.

This method is widely used in laboratory quality control and compositional analysis where accurate chloride measurement is required for regulatory compliance and product specification.

Key Topics

• Principle: Potentiometric titration of a sample solution or suspension with a standard AgNO3 solution; the end-point is taken at the inflection point of the potentiometric curve.

• Reagents: Concentrated nitric acid and standard volumetric silver nitrate solutions (commonly 0.05 mol/L or 0.02 mol/L are cited).

• Apparatus:

  • Potentiometer or pH meter with millivolt scale
  • Silver/silver chloride indicator electrode and suitable reference electrode
  • Variable-speed stirrer, burettes, pipettes and analytical balance

• Sample preparation: Mix sample to homogeneity. Transfer the selected test portion to a titration beaker with 100 mL water and stir to form a solution or suspension; insoluble products require extended stirring.

• Test portion guidance (example masses):

  • < 0.05 % NaCl - 25 g
  • 0.05–0.2 % - 15 g
  • 0.2–0.5 % - 5 g
  • 0.5–1 % - 2.5 g
  • 1–5 % - 0.5 g

• Titration procedure: Immerse electrodes, add 1 mL nitric acid, titrate with AgNO3 adding 1 mL increments and 0.2 mL near the end-point. Plot potential vs. volume and take the inflection point as the end-point.

• Calculation: Chloride content expressed as sodium chloride (NaCl) % m/m is calculated using the formula:

  0.05845 × c × V × 100 / m

  where c = concentration of AgNO3 (mol·L⁻¹), V = volume of AgNO3 at end-point (mL), m = mass of test portion (g).

• Performance: The standard provides repeatability and reproducibility guidance (e.g., maximum differences allowed between duplicate determinations and between laboratories for given chloride ranges).

Applications

• Routine quality control (QC) of starch and starch-derived products
• Compliance testing for food, feed and industrial specifications
• Comparative analyses in commercial laboratories where potentiometric chloride determination is required

Related Standards

• National or sector standards that govern sampling and sample handling for starch analysis
• ISO/TC 93 committee outputs on starches and derivatives

This summary highlights practical steps, instrumentation and calculation guidance from EN ISO 5810:1994 for reliable chloride determination by potentiometric titration using AgNO3.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-1998
âNURELQãNUREQLGHULYDWL'RORþHYDQMHNORULGD3RWHQFLRPHWULMVNDPHWRGD
Starches and derived products - Determination of chloride content - Potentiometric
method
Stärke und Stärkederivate - Bestimmung des Chloridgehaltes - Potentiometrisches
Verfahren
Amidons, fécules et produits dérivés - Détermination de la teneur en chlorures - Méthode
potentiométrique
Ta slovenski standard je istoveten z: EN ISO 5810:1994
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.

Internatio.nal Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWE~YHAPOC\HAR OPH-bl3AUMfI fl0 CTAH~PTM3A~W~RGANISATION INTERNATIONALE DE NORMALISATION
Starches and derived products - Determination of
chloride content - Potentiometric method
Determination de Ia teneur en Chlorures - Methode potentiombtrique
Amidons, fkcules et produits d&=iv& -
First edition - 1982-12-01
Ref. No. ISO 58104982 (E)
UDC 664.2 : 543.257 : 546.131
determination of content, chlorides, potentiometric analysis.
Descriptors : starches, Chemical analysis,
Price based on 2 pages
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of developing International
Standards is carried out through ISO technical committees. Every member body
interested in a subject for which a technical committee has been authorized 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 5810 was developed by Technical Committee ISO/TC 93,
Starch (incfuding derivatives and by-products), and was circulated to the member
bodies in February 1982.
lt has been approved by the member bodies of the following countries :
Austria Netherlands USA
Egypt, Arab Rep. of Portugal USSR
France
Romania
Germany, F. R. South Africa, Rep. of
No member body expressed disapproval of the document.
International Organization for Standardization, 1982
Printed in Switzerland
ISO 5810-1982 (E)
INTERNATIONAL STANDARD
Starches and derived products - Determination of
Potentiometric method
chloride content -
Scope and field sf application
1 4.6 Electrodes.
This International Standard specifies a potentiometric method
4.6.1 Silver/silver chloride electrode.
for the determination of the chloride content of starches and
derived products, except cationic starches and amyloids sol-
This may be purchased or may be prepared from a silver elec-
uble when cold, the viscosity of these being too high to allow
trode as follows:
for correct stirring when titrating.
- Immerse the silver electrode in an approximately
0,l mol/12) potassium chloride Solution and connect it to
2 Principle
the positive pole of a 4 V battery.
Potentiometric titration of a Solution or Suspension of the
- Connect the negative pole to a second silver or
Sample using a Standard volumetric silver nitrate Solution.
platinum electrode and pass the current through for about
5 min until the surface of the positive electrode becomes
dark in colour. Wash this positive electrode carefully with
3 Reagents
water and keep in water until required for use.
During the analysis, use onfy reagents of recognized analytical
4.62 Reference electrode.
quality and only distilled water or water of at least equivalent
purity.
Use an appropriate electrode System for the potentiometric
determination of chloride (such Systems are commercially
3.1 Nitrit acid, concentrated, ,920 ‘
...