Fruit and vegetable products -- Determination of ethanol

Produits dérivés des fruits et légumes -- Dosage de l'éthanol

Sadni in zelenjavni proizvodi - Določanje etanola

General Information

Status
Withdrawn
Publication Date
28-Feb-1995
Withdrawal Date
31-Oct-1998
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
01-Nov-1998
Due Date
01-Nov-1998
Completion Date
01-Nov-1998

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ISO 2448:1973 - Fruit and vegetable products -- Determination of ethanol
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INTERNATIONAL STANDARD
2448
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEWlYHAPOnHAR OPrAHHJAUHR Il0 CTAHiIAPTW3AUHM .ORGANISATION INTERNATIONALE DE NORMALISATION
e
Fruit and vegetable products - Determination of ethanol
First edition - 1973-05-15
e
UDC 664.8 : 543.8 : 547.262 Ref. No. IS0 2448-1973 (E)
Doscriptors : fruit products, vegetable products, chemical analysis, determination of content, ethanol, volumetric analysis.
Price based on 3 pages

---------------------- Page: 1 ----------------------
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member
Bodies). The work of developing
International Standards is carried out through IS0 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 IS0 Council.
International Standard IS0 2448 was drawn up by Technical Committee
34, Agricultural food products, and circulated to the Member Bodies in
ISO/TC
July 1971.
It has been approved by the Member Bodies of the following countries
Australia France Portugal
Brazil Hungary South Africa, Rep. of
Bulgaria India Spain
Chile
I ran Thailand
Czechoslovakia Korea, Dem.P.Rep. of Turkey
Egypt, Arab Rep. of Netherlands United Kingdom
Fin land
Poland
The Member Body of the following country expressed disapproval of the document
on technical grounds :
Germany
Q International Organization for Standardization, 1973 O
Printed in Switzerland

---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD IS0 2448-1973 (E)
Fruit and vegetable products - Determination of ethanol
1 SCOPE AND FIELD OF APPLICATION 4.4 Potassium dichromate solution, 42,572 g of K2Cr207
per litre.
1.1 Scope
1 ml of this solution is equivalent to 0,Ol g of ethanol.
This International Standard specifies a method for the
chemical determination of ethanol in fruit and vegetable
4.5 Potassium permanganate solution, 1,372 g of KMn04
(L/J products
per litre.
10 ml of this solution is equivalent to 1 ml of ammonium
1.2 Field of application
iron(l I) sulphate solution (4.6).
The method is not applicable to products containing more
than 5 % (rn/m) of ethanol
4.6 Ammonium iron(ll) sulphate hexahydrate
In the case of products containing essential oils, it is
[(NH4)2Fe(S04)z.6Hz0], 170.2 g/I solution containing
necessary to remove the latter (see section 8)
20 ml of sulphuric acid (4.1) per litre, obtained by
dissolving the salt in water, adding the sulphuric acid (4.1)
and diluting to the mark with water.
2 DEFINITION
Stabilize by the addition of aluminium chips
For the purpose of this International Standard, the fol-
lowing definition applies :
2 ml of this solution is equivalent to 1 ml of potassium
dichromate solution (4.4).
ethanol : The whole of the products which are oxidizable
under the conditions of the method described.
4.7 Ferrous o-phenanthroline solution
The ethanol content is expressed as a percentage by mass in
the case of solid products and as grams per 100 ml in the
Dissolve 0,695 g of iron(l1) sulphate heptahydrate
case of liquid products.
(FeS04.7H20) in 100 ml of water, add 1,485 g of
o-phenanthroline monohydrate and heat to aid solution.
i
The solution keeps well.
3 PRINCIPLE
Separation of th-e ethanol by distillation, followed by
oxidation by potassium dichromate in a sulphuric acid
5 APPARATUS
medium. Determination of the excess dichromate by
ammonium iron(l1) sulphate in the presence of ferrous
o-phenanthroline as indicator.
5.1 Distillation apparatus, comprising a 500 ml flask
surmounted by a fractionation column and a condenser
ending in a slightly tapered extension piece long enough to
4 REAGENTS
reach to the bottom of a 100 ml volumetric flask.
All reagents shall be of recognized analytical quality. The
Any other steam distillation apparatus may be used,
water used shall be distilled water or water of at least equal
provided that it satisfies the following test :
purity .
200 ml of a 10 % ethanol/water mixture distilled five times
at least 9,9% of ethanol after
in succession shall contain
4.1 Sulphuric acid, p20 =1,836 g/ml.
the last distillation, i.e. no loss of ethanol greater than
0.02 % shall occur in the course of a distillation.
4.2 Sulphuric acid, p20 =1,488 g/ml, solution containing
500 ml of sulphuric acid (4.1) per litre.
5.2 Heating apparatus which does not cause even slight
decomposition of the extractable materials contained in the
4.3 Calcium hydroxide, [ Ca(0H) 2], suspension obtained
flask.
by slaking 110 to 112 g of calcium oxide in 1 litre of water.
1

---------------------- Page: 3 ----------------------
IS0 2448-1973 (E)
Distil in such a way that the distillate, when it reaches the
5.3 One-mark volumetric flasks, capacity 100 ml,
volumetric flask, is at a relatively low temperature (15 to
complying with Class A of ISO/R 1042.
20 "Cl.
5.4 One-mark pipettes, capacities 5, 10 and 20 ml,
Collect about 80 to 85 ml of distillate. Stop the distillation
complying with Class A of ISO/R 648.
and rinse the condenser and extension with a few millilitres
of water.
5.5 Burettes, fitted with stopcock, capacity 50 ml,
complying with Class A of ISO/R 385.
Shake the volumetric flask to mix the contents. If necessary
immerse the flask in cold water (15 to 20 OC) for a few
5.6 Wide-necked flasks, capacity 250 ml, fitted with
minutes.
ground glass stoppers, clean, dry, free from grease and
airtight (absolute tightness can be ensured with the aid of a
Dilute the contents of the volumetric flask to the mark
polytetrafluorethylene sleeve).
with water and shake.
5.7 Blender.
6.3.2 Oxidation
5.8 Analytical balance.
Pour 20 ml (volume V,) of potassium dichromate solution
(4.4). accurately measured (see 6.5.1), and 20 ml of
siilphuric acid solution (4.2) into a 250 ml flask with
6 PROCEDURE
ground glass stopper (5.6) and shake.
Add 10 ml (volume V,) of distillate, accurately measured.
6.1 Preparation of the test sample.
Stopper the flask, moistening the stopper with a drop of
sulphuric acid (4.1), shake and wait for at least 30 mi
...

SLOVENSKI STANDARD
SIST ISO 2448:1995
01-marec-1995
6DGQLLQ]HOHQMDYQLSURL]YRGL'RORþDQMHHWDQROD
Fruit and vegetable products -- Determination of ethanol
Produits dérivés des fruits et légumes -- Dosage de l'éthanol
Ta slovenski standard je istoveten z: ISO 2448:1973
ICS:
67.080.01 Sadje, zelenjava in njuni Fruits, vegetables and
proizvodi na splošno derived products in general
SIST ISO 2448:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 2448:1995

---------------------- Page: 2 ----------------------

SIST ISO 2448:1995
INTERNATIONAL STANDARD
2448
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEWlYHAPOnHAR OPrAHHJAUHR Il0 CTAHiIAPTW3AUHM .ORGANISATION INTERNATIONALE DE NORMALISATION
e
Fruit and vegetable products - Determination of ethanol
First edition - 1973-05-15
e
UDC 664.8 : 543.8 : 547.262 Ref. No. IS0 2448-1973 (E)
Doscriptors : fruit products, vegetable products, chemical analysis, determination of content, ethanol, volumetric analysis.
Price based on 3 pages

---------------------- Page: 3 ----------------------

SIST ISO 2448:1995
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member
Bodies). The work of developing
International Standards is carried out through IS0 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 IS0 Council.
International Standard IS0 2448 was drawn up by Technical Committee
34, Agricultural food products, and circulated to the Member Bodies in
ISO/TC
July 1971.
It has been approved by the Member Bodies of the following countries
Australia France Portugal
Brazil Hungary South Africa, Rep. of
Bulgaria India Spain
Chile
I ran Thailand
Czechoslovakia Korea, Dem.P.Rep. of Turkey
Egypt, Arab Rep. of Netherlands United Kingdom
Fin land
Poland
The Member Body of the following country expressed disapproval of the document
on technical grounds :
Germany
Q International Organization for Standardization, 1973 O
Printed in Switzerland

---------------------- Page: 4 ----------------------

SIST ISO 2448:1995
INTERNATIONAL STANDARD IS0 2448-1973 (E)
Fruit and vegetable products - Determination of ethanol
1 SCOPE AND FIELD OF APPLICATION 4.4 Potassium dichromate solution, 42,572 g of K2Cr207
per litre.
1.1 Scope
1 ml of this solution is equivalent to 0,Ol g of ethanol.
This International Standard specifies a method for the
chemical determination of ethanol in fruit and vegetable
4.5 Potassium permanganate solution, 1,372 g of KMn04
(L/J products
per litre.
10 ml of this solution is equivalent to 1 ml of ammonium
1.2 Field of application
iron(l I) sulphate solution (4.6).
The method is not applicable to products containing more
than 5 % (rn/m) of ethanol
4.6 Ammonium iron(ll) sulphate hexahydrate
In the case of products containing essential oils, it is
[(NH4)2Fe(S04)z.6Hz0], 170.2 g/I solution containing
necessary to remove the latter (see section 8)
20 ml of sulphuric acid (4.1) per litre, obtained by
dissolving the salt in water, adding the sulphuric acid (4.1)
and diluting to the mark with water.
2 DEFINITION
Stabilize by the addition of aluminium chips
For the purpose of this International Standard, the fol-
lowing definition applies :
2 ml of this solution is equivalent to 1 ml of potassium
dichromate solution (4.4).
ethanol : The whole of the products which are oxidizable
under the conditions of the method described.
4.7 Ferrous o-phenanthroline solution
The ethanol content is expressed as a percentage by mass in
the case of solid products and as grams per 100 ml in the
Dissolve 0,695 g of iron(l1) sulphate heptahydrate
case of liquid products.
(FeS04.7H20) in 100 ml of water, add 1,485 g of
o-phenanthroline monohydrate and heat to aid solution.
i
The solution keeps well.
3 PRINCIPLE
Separation of th-e ethanol by distillation, followed by
oxidation by potassium dichromate in a sulphuric acid
5 APPARATUS
medium. Determination of the excess dichromate by
ammonium iron(l1) sulphate in the presence of ferrous
o-phenanthroline as indicator.
5.1 Distillation apparatus, comprising a 500 ml flask
surmounted by a fractionation column and a condenser
ending in a slightly tapered extension piece long enough to
4 REAGENTS
reach to the bottom of a 100 ml volumetric flask.
All reagents shall be of recognized analytical quality. The
Any other steam distillation apparatus may be used,
water used shall be distilled water or water of at least equal
provided that it satisfies the following test :
purity .
200 ml of a 10 % ethanol/water mixture distilled five times
at least 9,9% of ethanol after
in succession shall contain
4.1 Sulphuric acid, p20 =1,836 g/ml.
the last distillation, i.e. no loss of ethanol greater than
0.02 % shall occur in the course of a distillation.
4.2 Sulphuric acid, p20 =1,488 g/ml, solution containing
500 ml of sulphuric acid (4.1) per litre.
5.2 Heating apparatus which does not cause even slight
decomposition of the extractable materials contained in the
4.3 Calcium hydroxide, [ Ca(0H) 2], suspension obtained
flask.
by slaking 110 to 112 g of calcium oxide in 1 litre of water.
1

---------------------- Page: 5 ----------------------

SIST ISO 2448:1995
IS0 2448-1973 (E)
Distil in such a way that the distillate, when it reaches the
5.3 One-mark volumetric flasks, capacity 100 ml,
volumetric flask, is at a relatively low temperature (15 to
complying with Class A of ISO/R 1042.
20 "Cl.
5.4 One-mark pipettes, capacities 5, 10 and 20 ml,
Collect about 80 to 85 ml of distillate. Stop the distillation
complying with Class A of ISO/R 648.
and rinse the condenser and extension with a few millilitres
of water.
5.5 Burettes, fitted with stopcock, capacity 50 ml,
complying with Class A of ISO/R 385.
Shake the volumetric flask to mix the contents. If necessary
immerse the flask in cold water (15 to 20 OC) for a few
5.6 Wide-necked flasks, capacity 250 ml, fitted with
minutes.
ground glass stoppers, clean, dry, free from grease and
airtight (absolute tightness can be ensured with the aid of a
Dilute the contents of the volumetric flask to the mark
polytetrafluorethylene sleeve).
with water and shake.
5.7 Blender.
6.3.2 Oxidation
5.8 Analytical balance.
Pour 20 ml (volume V,) of potassium dichromate solution
(4.4). accurat
...

-
NORME INTERNATIONALE 2448
INTERNATIONAL DRGANIZATION FOR STANDARDIZATION -MEXAYHAPOAHAR OPiAHMJAUHR Il0 CTAHLIAPTH3AUHH *ORGANISATION INTERNATIONALE DE NORMALISATION
i- Produits dérives des fruits et legumes Osage de
Première édition - 1973-05-15
~
~~
CDU 664.8 : 543.8 : 547.262 Réf. NO : IS0 2448-1973 (F)
Descripteurs : produit dérivé de fruits, produit végétal, analyse chimique, dosage, éthanol, analyse volumétrique.
Prix basé sur 3 pages
d

---------------------- Page: 1 ----------------------
NORME INTERNATIONALE IS0 2448-1973 (F)
Produits dérives des fruits et légumes - Dosage de l’éthanol
1 OBJET ET DOMAINE D’APPLICATION 4.4 Dichromate de potassium, solution à 42,572 g de
K2Cr207 par litre.
1.1 Objet
1 ml de cette solution correspond à 0,Ol g d’éthanol
La présente Norme Internationale spécifie une méthode de
dosage chimique de l’éthanol dans les produits dérivés des
4.5 Permanganate de potassium, solution à 1,372 g de
fruits et légumes.
KMn04 par litre.
10 ml de cette solution correspondent à 1 ml de solution de
1.2 Domaine d‘application
et d’ammonium (4.6).
sulfate de fer(iI)
La méthode n’est pas applicable aux produits contenant
plus de 5 % (m/rn) d‘éthanol.
4.6 Sulfate de fer(ll) et d’ammonium hexahydrate
Dans le cas de produits contenant des huiles essentielles, il
[ Fe(NH4)2(S04)2.6H20], solution à 170,2 g/1, contenant
est nécessaire de prûcéder à l‘élimination de celles-ci (voir
20 ml d‘acide sulfurique (4.1) par litre, obtenue par
chapitre 8).
dissolution dans i’eau, addition d‘acide sulfurique (4.1) et
en complétant au volume avec de l’eau.
2 DÉFINITION
Stabiliser par addition de copeaux d’aluminium.
Dans le cadre de la présente Norme Internationale, la
2 ml de cette solution correspondent à 1 ml de solution de
définition suivante est applicable :
dichromate de potassium (4.4).
étharrol : Ensemble des produits oxydables, dans les
conditions de Io méthode décrite. 4.7 Orthophénantroline ferreuse, en solution.
La teneur en éthanol est exprimée en pourcentage en masse,
Dissoudre 0,695 g de sulfate de fer(lI) heptahydraté
dans le cas de produits solides, et en grammes par 100 ml, (FeÇO4.7H2O) dans 1 O0 ml d’eau, ajouter 1,485 g de
dans le cas de produits liquides. monohydrate d’orthophénantroline. Chauffer pour
kL
favoriser la dissolution.
Cette solution se conserve bien.
3 PRINCIPE
Séparation de l‘éthanol par distillation, puis oxydation en
milieu sulfurique par le dichromate de potassium. Dosage
de l’excès de dichromate par le sulfate de ferlll) et
5 APPAREILLAGE
d’ammonium, en présence d‘orthophénantroline ferreuse.
5.1 Appareil à distiller, comprenant un ballon de 500 ml
surmonté d’une colonne rectificatrice et d‘un réfrigérant
4 REACTIFS
descendant vertical terminé par une allonge légèrement
Tous les réactifs doivent être de qualité analytique
effilée dont l‘extrémité doit pouvoir plonger jusqu‘au fond
reconnue et l’eau utilisée doit être de l‘eau distillée ou de
d’une fiole jaugée de 100 ml.
pureté au moins équivalente.
Tout autre modèle d’appareil à distiller ou d’entraînement à
la vapeur peut être utilisé, à condition que l‘appareil adopté
4.1 Acide sulfurique, p2,, = 1,836 g/ml.
réponde à l’essai suivant :
4.2 Acide sulfurique, p20 = 1,488 g/ml, solution à 500 ml
200 ml d’un mélange eau-éthanol à 10 %, distillé cinq fois
d’acide sulfurique (4.1) par litre.
de suite, doit contenir au moins 9,9 % d’éthanol après la
dernière distillation, c‘est-à-dire qu’il ne doit pas se produire
de perte d’éthanol supérieure à 0.02% au cours d’une
4.3 Hydroxyde de calcium [Ca(OH)2], suspension obtenue
distillation.
endélitant 110à 112gd’oxydede calcium dans 1 litre d’eau.
1

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1
IS0 2448-1973 (F)
...

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