EN ISO 3946:1994

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

International Standard
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
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
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,
...