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

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).

Stärke und Stärkederivate - Bestimmung des Gesamtphosphorgehaltes - Spektralphotometrisches Verfahren (ISO 3946:1982)

Diese Internationale Norm legt ein spektralphotometrisches Verfahren zur Bestimmung des Gesamtphosphorgehalts von Stärke, einschliesslich Derivate und Nebenprodukte, fest, deren als Phosphor (P) berechneter, erwarteter Massenanteil 5% nicht überschreitet.

Amidons, fécules et produits dérivés - Détermination de la teneur en phosphore total - Méthode spectrophotométrique (ISO 3946:1982)

La présente Norme internationale spécifie une méthode de détermination de la teneur en phosphore total des amidons, fécules et produits dérivés, dont la teneur escomptée est inférieure à 5 % (m/m) en phosphore (P).

Škrobi in škrobni derivati - Določevanje celotnega fosforja - Spektrofotometrijska metoda (ISO 3946:1982)

General Information

Status
Published
Publication Date
24-Aug-1994
Technical Committee
Drafting Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Due Date
13-Oct-1999
Completion Date
13-Oct-1999

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SLOVENSKI STANDARD
SIST EN ISO 3946:1998
01-november-1998

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Starches and derived products - Determination of total phosphorus content -
Spectrophotometric method (ISO 3946:1982)
Stärke und Stärkederivate - Bestimmung des Gesamtphosphorgehaltes -
Spektralphotometrisches Verfahren (ISO 3946:1982)

Amidons, fécules et produits dérivés - Détermination de la teneur en phosphore total -

Méthode spectrophotométrique (ISO 3946:1982)
Ta slovenski standard je istoveten z: EN ISO 3946:1994
ICS:
67.180.20 Škrob in izdelki iz njega Starch and derived products
SIST EN ISO 3946:1998 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 3946:1998
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SIST EN ISO 3946:1998
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SIST EN ISO 3946:1998
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SIST EN ISO 3946:1998
International Standard
3946

INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWEIKJJYHAPOAHAR OPTAHM3AWlR fl0 CTAH~APTM3AWlM~RGANISATION INTERNATIONALE DE NORMALISATION

Starches and derived products - Determination of total
Spectrophotometric method
phosphorus content -

Amidons, fkcules et produirs d&iv& - Determination de Ia teneur en Phosphore total - Mkthode spectrophotometrique

First edition - 1982-12-01
UDC 664.2 : 543.847 Ref. No. ISO 3946-1982 (EI

Descriptors : starches, Chemical analysis, determination of content, phosphorus, spectrophotometric analysis.

Price based on 3 pages
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SIST EN ISO 3946:1998
Foreword

BS0 (the international Organization for Standardization) is a wsrldwide federation of

national Standards institutes (60 member bedies). The werk 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 ts be represented on that csmmittee. 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 apprsval before their acceptance as International Standards by

the ISO Council.
International Standard ISO 3946 was developed by Technical Committee ISO/TC 93,
Starch fincluding derivatives and Qy-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 USA
Egypt, Arab Rep. of Roland
USSR
France
Portugal
Germany, F. R. South Africa, Rep. sf
No member body expressed disapproval of the document.
@ International Organization for Standardization, 1982 0
Printed in Switzerland
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SIST EN ISO 3946:1998
INTERNATIONAL STANDARD
ISO 3946-1982 (E)
Starches and derived products - Determination of total
phosphorus content - Spectrophotometric method
4.4 Ammonium molybdate Solution, prepared as follows.
1 Scope and field of application

This International Standard specifies a spectrophotometric In a 1 I flask, dissolve 10,6 g of ammonium molybdate

tetrahydrate [(NH&Mo70~+4H201 in 500 ml of water.
method for the determination of the total phosphorus content
of starch, including derivatives and by-products, in which the

expected content, calculated as phosphorus (P), does not Add 500 ml of 10 mol/1 sulphuric acid Solution, mix and allow

to cool to ambient temperature.
exceed 5 % (mlm).
Sodium hydroxide, 10 mol/1 Solution.
4.5
2 Definition
46 . Phosphorus, Standard solutions.
total phosphorus content : The quantity of phosphorus
determined in accordance with the conditions specified in this
4.6.1 Stock Solution, corresponding to 100 mg of P per litre.
International Standard and expressed as phosphorus (P) as a
percentage by mass of the product as received.
Weigh, to the nearest 0,5 mg, 0,439 3 g of anhydrous
potassium dihydrogenorthophosphate and dissolve in water.
Transfer quantitatively into a 1 000 ml one-mark volumetric
flask.
3 Principle
Dilute to the mark with water and mix.
Destruction of the organic substances by digestion with a
sulpho-nitric mixture and conversion of Phosphates to ortho-
1 ml of this Standard Solution contains 100 pg of P.
Phosphates.
NOTE - The potassium dihydrogenorthophosphate shall be dried
Formation,
...

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