Petroleum products - Determination of sulfated ash in lubricating oils and additives

This International Standard describes a procedure for the determination of the mass percentage of sulfated ash from unused lubricating oils containing additives and from additive concentrates used in compounding. These additives usually contain one or more of the following metals: barium, calcium, magnesium, zinc, potassium, sodium and tin. The elements sulfur, phosphorus and chlorine can also be present in combined form. Application of this procedure to sulfated ash levels below 0,02 % (m/m) is restricted to oils containing ashless additives. The lower limit of applicability of the procedure is 0,005 % (m/m) sulfated ash.

Produits pétroliers - Détermination des cendres sulfatées dans les huiles lubrifiantes et dans les additifs

L'ISO 3987:2010 sp�cifi� une m�thode de d�termination des cendres sulfat�es dans les huiles lubrifiantes neuves contenant des additifs et dans les additifs eux-m�mes. Ces additifs contiennent habituellement un ou plusieurs des m�taux suivants: baryum, calcium, magn�sium, zinc, potassium, sodium ou �tain. Les �l�ments soufre, phosphore ou chlore peuvent �galement �tre pr�sents sous forme combin�e.
L�application de cette m�thode aux taux de cendres sulfat�es inf�rieurs � 0,02 % (m/m) est limit�e aux huiles contenant des additifs sans cendres. La limite inf�rieure d'applicabilit� de la m�thode est 0,005 % (m/m) de cendres sulfat�es.

Naftni proizvodi - Določevanje sulfatnega pepela v mazalnih oljih in aditivih

Ta mednarodni standard opisuje postopek za določevanje masnega odstotka sulfatnega pepela iz neuporabljenih mazalnih olj, ki vsebujejo aditive, in iz koncentratov aditivov, ki se uporabljajo pri mešanju. Ti aditivi običajno vsebujejo eno ali več od naslednjih kovin: barij, kalcij, magnezij, cink, kalij, natrij in kositer. Elementi žveplo, fosfor in klor so tudi lahko prisotni v kombinirani obliki. Uporaba tega postopka za ravni sulfatnega pepela pod 0,02 % (m/m) je omejena na olja, ki vsebujejo aditive brez pepela. Spodnja meja uporabnosti tega postopka je 0,005 % (m/m) sulfatnega pepela.

General Information

Status
Published
Publication Date
11-Oct-2011
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
30-Sep-2011
Due Date
05-Dec-2011
Completion Date
12-Oct-2011

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INTERNATIONAL ISO
STANDARD 3987
Third edition
2010-11-15
Petroleum products — Determination of
sulfated ash in lubricating oils and
additives
Produits pétroliers — Détermination des cendres sulfatées dans les
huiles lubrifiantes et dans les additifs
Reference number
ISO 3987:2010(E)
ISO 2010
---------------------- Page: 1 ----------------------
ISO 3987:2010(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2010

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2010 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 3987:2010(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established 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. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 3987 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants.

This third edition cancels and replaces the second edition (ISO 3987:1994), which has been technically

revised.
© ISO 2010 – All rights reserved iii
---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 3987:2010(E)
Petroleum products — Determination of sulfated ash in
lubricating oils and additives

WARNING — The use of this International Standard may involve hazardous materials, operations and

equipment. This International Standard does not purport to address all of the safety problems

associated with its use. It is the responsibility of the user of this International Standard to establish

appropriate safety and health practices and determine the applicability of regulatory limitations prior

to use.
1 Scope

This International Standard describes a procedure for the determination of the mass percentage of sulfated

ash from unused lubricating oils containing additives and from additive concentrates used in compounding.

These additives usually contain one or more of the following metals: barium, calcium, magnesium, zinc,

potassium, sodium and tin. The elements sulfur, phosphorus and chlorine can also be present in combined

form.

Application of this procedure to sulfated ash levels below 0,02 % (m/m) is restricted to oils containing ashless

additives. The lower limit of applicability of the procedure is 0,005 % (m/m) sulfated ash.

NOTE 1 For the purposes of this International Standard, the terms % (m/m) and % (V/V) are used to represent the

mass fraction and volume fraction of a material, respectively.

This International Standard is not intended for the analysis of used engine oils containing lead, nor is it

[1]

recommended for the analysis of non-additive lubricating oils, for which ISO 6245 is suitable.

NOTE 2 There is evidence that magnesium does not react in the same manner as alkali metals in this procedure. If

magnesium additives are present, it is advisable to interpret the data with caution.

NOTE 3 There is evidence that samples containing molybdenum can give low results, since molybdenum compounds

are not fully recovered at the temperature of ashing.

The sulfated ash may be used to indicate the concentration of known metal-containing additives in new

lubricating oils. When phosphorus is absent, barium, calcium, magnesium, sodium and potassium are

converted to their sulfates, and tin (IV) and zinc to their oxides.

NOTE 4 Since zinc sulfate slowly decomposes to its oxide at the ignition temperature specified in the procedure,

samples containing zinc may give variable results unless the zinc sulfate is completely converted to the oxide.

Sulfur and chlorine do not interfere, but when phosphorus is present with metals, it remains partially or wholly

in the sulfated ash as metal phosphates.
[2] [3]

NOTE 5 Fatty acid methyl esters (FAME) conforming to EN 14213 and EN 14214 , when tested using this

International Standard, were shown to meet its precision.
© ISO 2010 – All rights reserved 1
---------------------- Page: 4 ----------------------
ISO 3987:2010(E)
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 3170, Petroleum liquids — Manual sampling
ISO 3171, Petroleum liquids — Automatic pipeline sampling

ISO 3696:1987, Water for analytical laboratory use — Specification and test methods

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sulfated ash

residue remaining after the lubricating oil sample has been carbonized, and the residue subsequently treated

with sulfuric acid and heated to constant mass
4 Principle

The sample of unused lubricating oil is ignited and burned until only ash and carbon remain. After cooling, the

residue is treated with sulfuric acid and heated at 775 °C until oxidation of carbon is complete. The ash is then

cooled, retreated with sulfuric acid, and heated at 775 °C to constant mass. The mass percentage of sulfated

ash obtained is then calculated.
5 Reagents

For the analysis described in this International Standard, use only reagents of recognized analytical reagent

grade and water complying with the requirements of grade 3 of ISO 3696:1987.

5.1 Low-ash mineral oil, white oil having a sulfated ash content (determined as follows) lower than the

limit capable of being determined by this International Standard.

Determine the sulfated ash of the oil by the procedure given in Clause 8, but using 100 g of white oil, weighed

to the nearest 0,5 g, in a 120 ml to 150 ml platinum dish. Deduct the sulfuric acid blank as described in 8.11.

5.2 Sulfuric acid (H SO ), concentrated, 98 % minimum purity.
2 4

CAUTION — Sulfuric acid is highly corrosive, a strong oxidizer, and has a high heat of hydration.

Protective clothing, including gloves and face mask, should be worn during operations involving this

acid.

5.3 Sulfuric acid (1 + 1), prepared by slowly adding one volume of the concentrated acid (5.2) to one

volume of water.

CAUTION — Mixing sulfuric acid into water generates considerable heat. When necessary, cool the

solution before adding more acid. Do not allow the solution to boil. Never add the water to the acid.

...

SLOVENSKI STANDARD
SIST ISO 3987:2011
01-november-2011
1DGRPHãþD
SIST ISO 3987:1996
1DIWQLSURL]YRGL'RORþHYDQMHVXOIDWQHJDSHSHODYPD]DOQLKROMLKLQDGLWLYLK

Petroleum products - Determination of sulfated ash in lubricating oils and additives

Produits pétroliers - Détermination des cendres sulfatées dans les huiles lubrifiantes et

dans les additifs
Ta slovenski standard je istoveten z: ISO 3987:2010
ICS:
75.100 Maziva Lubricants, industrial oils and
related products
SIST ISO 3987:2011 en

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

---------------------- Page: 1 ----------------------
SIST ISO 3987:2011
---------------------- Page: 2 ----------------------
SIST ISO 3987:2011
INTERNATIONAL ISO
STANDARD 3987
Third edition
2010-11-15
Petroleum products — Determination of
sulfated ash in lubricating oils and
additives
Produits pétroliers — Détermination des cendres sulfatées dans les
huiles lubrifiantes et dans les additifs
Reference number
ISO 3987:2010(E)
ISO 2010
---------------------- Page: 3 ----------------------
SIST ISO 3987:2011
ISO 3987:2010(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2010

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2010 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 3987:2011
ISO 3987:2010(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established 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. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 3987 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants.

This third edition cancels and replaces the second edition (ISO 3987:1994), which has been technically

revised.
© ISO 2010 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 3987:2011
---------------------- Page: 6 ----------------------
SIST ISO 3987:2011
INTERNATIONAL STANDARD ISO 3987:2010(E)
Petroleum products — Determination of sulfated ash in
lubricating oils and additives

WARNING — The use of this International Standard may involve hazardous materials, operations and

equipment. This International Standard does not purport to address all of the safety problems

associated with its use. It is the responsibility of the user of this International Standard to establish

appropriate safety and health practices and determine the applicability of regulatory limitations prior

to use.
1 Scope

This International Standard describes a procedure for the determination of the mass percentage of sulfated

ash from unused lubricating oils containing additives and from additive concentrates used in compounding.

These additives usually contain one or more of the following metals: barium, calcium, magnesium, zinc,

potassium, sodium and tin. The elements sulfur, phosphorus and chlorine can also be present in combined

form.

Application of this procedure to sulfated ash levels below 0,02 % (m/m) is restricted to oils containing ashless

additives. The lower limit of applicability of the procedure is 0,005 % (m/m) sulfated ash.

NOTE 1 For the purposes of this International Standard, the terms % (m/m) and % (V/V) are used to represent the

mass fraction and volume fraction of a material, respectively.

This International Standard is not intended for the analysis of used engine oils containing lead, nor is it

[1]

recommended for the analysis of non-additive lubricating oils, for which ISO 6245 is suitable.

NOTE 2 There is evidence that magnesium does not react in the same manner as alkali metals in this procedure. If

magnesium additives are present, it is advisable to interpret the data with caution.

NOTE 3 There is evidence that samples containing molybdenum can give low results, since molybdenum compounds

are not fully recovered at the temperature of ashing.

The sulfated ash may be used to indicate the concentration of known metal-containing additives in new

lubricating oils. When phosphorus is absent, barium, calcium, magnesium, sodium and potassium are

converted to their sulfates, and tin (IV) and zinc to their oxides.

NOTE 4 Since zinc sulfate slowly decomposes to its oxide at the ignition temperature specified in the procedure,

samples containing zinc may give variable results unless the zinc sulfate is completely converted to the oxide.

Sulfur and chlorine do not interfere, but when phosphorus is present with metals, it remains partially or wholly

in the sulfated ash as metal phosphates.
[2] [3]

NOTE 5 Fatty acid methyl esters (FAME) conforming to EN 14213 and EN 14214 , when tested using this

International Standard, were shown to meet its precision.
© ISO 2010 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 3987:2011
ISO 3987:2010(E)
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 3170, Petroleum liquids — Manual sampling
ISO 3171, Petroleum liquids — Automatic pipeline sampling

ISO 3696:1987, Water for analytical laboratory use — Specification and test methods

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sulfated ash

residue remaining after the lubricating oil sample has been carbonized, and the residue subsequently treated

with sulfuric acid and heated to constant mass
4 Principle

The sample of unused lubricating oil is ignited and burned until only ash and carbon remain. After cooling, the

residue is treated with sulfuric acid and heated at 775 °C until oxidation of carbon is complete. The ash is then

cooled, retreated with sulfuric acid, and heated at 775 °C to constant mass. The mass percentage of sulfated

ash obtained is then calculated.
5 Reagents

For the analysis described in this International Standard, use only reagents of recognized analytical reagent

grade and water complying with the requirements of grade 3 of ISO 3696:1987.

5.1 Low-ash mineral oil, white oil having a sulfated ash content (determined as follows) lower than the

limit capable of being determined by this International Standard.

Determine the sulfated ash of the oil by the procedure given in Clause 8, but using 100 g of white oil, weighed

to the nearest 0,5 g, in a 120 ml to 150 ml platinum dish. Deduct the sulfuric acid blank as described in 8.11.

5.2 Sulfuric acid (H SO ), concentrated, 98 % minimum purity.
2 4
CAUTION — Sulfuric acid is highly corrosive,
...

NORME ISO
INTERNATIONALE 3987
Troisième édition
2010-11-15
Produits pétroliers — Détermination
des cendres sulfatées dans les huiles
lubrifiantes et additifs
Petroleum products — Determination of sulfated ash in lubricating
oils and additives
Numéro de référence
ISO 3987:2010(F)
ISO 2010
---------------------- Page: 1 ----------------------
ISO 3987:2010(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2010, Publié en Suisse

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée

sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie, l’affichage sur

l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent être adressées à l’ISO à

l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2010 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 3987:2010(F)
Sommaire Page

Avant-propos ..............................................................................................................................................................................................................................iv

1 Domaine d’application ................................................................................................................................................................................... 1

2 Références normatives ................................................................................................................................................................................... 2

3 Termes et définitions ....................................................................................................................................................................................... 2

4 Principe .......................................................................................................................................................................................................................... 2

5 Réactifs ........................................................................................................................................................................................................................... 2

6 Appareillage .............................................................................................................................................................................................................. 3

7 Échantillons et échantillonnage ........................................................................................................................................................... 3

8 Mode opératoire.................................................................................................................................................................................................... 3

9 Calculs .............................................................................................................................................................................................................................. 5

10 Expression des résultats............................................................................................................................................................................... 5

11 Fidélité ............................................................................................................................................................................................................................ 5

11.1 Répétabilité, r ............................................................................................................................................................................................5

11.2 Reproductibilité, R ................................................................................................................................................................................6

12 Rapport d’essai ....................................................................................................................................................................................................... 6

Bibliographie .............................................................................................................................................................................................................................. 7

© ISO 2010 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 3987:2010(F)
Avant-propos

L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes

nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est

en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.

L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1 Il convient, en particulier, de prendre note des différents

critères d’approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www.

iso.org/directives).

L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de

droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de

brevets reçues par l’ISO (voir www.iso.org/brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la signification des termes et expressions spécifiques de l’ISO liés à l’évaluation

de la conformité, ou pour toute information au sujet de l’adhésion de l’ISO aux principes de l’Organisation

mondiale du commerce (OMC) concernant les obstacles techniques au commerce (OTC), voir le lien

suivant: www.iso.org/iso/fr/avant-propos.html.

L’ISO 3987 a été élaborée par le comité technique ISO/TC 28, Produits pétroliers et connexes d’origine

synthétique ou biologique.

Cette troisième édition annule et remplace la deuxième (ISO 3987:1994), qui a fait l’objet d’une révision

technique.
iv © ISO 2010 – Tous droits réservés
---------------------- Page: 4 ----------------------
NORME INTERNATIONALE ISO 3987:2010(F)
Produits pétroliers — Détermination des cendres sulfatées
dans les huiles lubrifiantes et additifs

AVERTISSEMENT — L´utilisation de la présente Norme internationale implique l’intervention

de produits, d’opérations et d´équipements à caractère dangereux. La présente Norme

internationale n’a pas la prétention d’aborder tous les problèmes de sécurité concernés par son

usage. Il est de la responsabilité de l’utilisateur de consulter et d´établir des règles de sécurité

et d’hygiène appropriées et de déterminer l’applicabilité des restrictions réglementaires avant

utilisation.
1 Domaine d’application

La présente Norme internationale spécifié une méthode de détermination des cendres sulfatées

dans les huiles lubrifiantes neuves contenant des additifs et dans les additifs eux-mêmes. Ces additifs

contiennent habituellement un ou plusieurs des métaux suivants: baryum, calcium, magnésium, zinc,

potassium, sodium ou étain. Les éléments soufre, phosphore ou chlore peuvent également être présents

sous forme combinée.

L´application de cette méthode aux taux de cendres sulfatées inférieurs à 0,02 % (m/m) est limitée aux

huiles contenant des additifs sans cendres. La limite inférieure d’applicabilité de la méthode est 0,005 %

(m/m) de cendres sulfatées.

NOTE 1 Pour les besoins de la présente Norme internationale, les expressions «% (m/m)» et «% (V/V)»

représentent respectivement les fractions massiques et volumiques.

Cette méthode n’est pas recommandée pour l’analyse des huiles moteurs usées, contenant du plomb.

Elle n’est pas non plus recommandée pour l’analyse des huiles lubrifiantes qui ne contiennent pas

[1]
d’additifs pour laquelle l´ISO 6245 est recommandée.

NOTE 2 Il est évident que le magnésium ne réagira pas de la même façon que d’autres métaux alcalins dans

cette méthode. Si des additifs contenant du magnésium sont présents, il est conseillé d’interpréter les résultats

avec précaution.

NOTE 3 II est évident que les échantillons contenant du molybdène peuvent donner des mauvais résultats

puisque ces composés ne sont pas complètement récupérés à la température de l’essai.

Lorsque les métaux présents dans les additifs sont connus, les cendres sulfatées peuvent être utilisées

comme une indication de la concentration de ces additifs dans les huiles lubrifiantes neuves. En l’absence

de phosphore, le baryum, le calcium, le magnésium, le sodium et le potassium sont transformés en

sulfates correspondants et l´étain (IV) et le zinc sont transformés en oxydes.

NOTE 4 Comme le sulfate de zinc se décompose lentement en oxyde, à la température d’inflammation indiquée

dans cette méthode, les prises d’essai contenant du zinc peuvent donner des résultats variables, à moins que le

sulfate de zinc ne soit entièrement transformé en oxyde.

Le soufre et le chlore n’interfèrent pas, mais quand le phosphore est présent, avec les métaux, il subsiste

partiellement ou entièrement dans les cendres sulfatées à l´état de phosphates métalliques.

NOTE 5 Les essais suivant cette méthode sur les esters méthyliques d’acides gras (EMAG) conformes à

[2]

l’EN 14214 ont prouvé que les valeurs de fidélité de cette Norme internationale étaient respectées avec ces

produits.
© ISO 2010 – Tous droits réservés 1
---------------------- Page: 5 ----------------------
ISO 3987:2010(F)
2 Références normatives

Les documents de référence suivants sont indispensables pour l’application du présent document. Pour

les références datées, seule l’édition citée s’applique. Pour les références non datées, la dernière édition

du document de référence s’applique (y compris les éventuels amendements).
ISO 3170, Produits pétroliers liquides — Échantillonnage manuel
ISO 3171, Produits pétroliers liquides — Échantillonnage automatique en oléoduc

ISO 3696:1987, Eau pour laboratoire à usage analytique — Spécification et méthodes d’essai

3 Termes et définitions
Pour les besoins du présent document, la définition suivante s’applique.
3.1
cendres sulfatées
résidu restant après que l´é
...

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