Diesel engines -- NOx reduction agent AUS 32

This document specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea solution) which is needed to operate selective catalytic reduction (SCR) converter systems in motor vehicles with diesel engines. SCR converter systems are particularly suitable for selectively reducing the nitrogen oxide (NOx) emissions of diesel engines.

Moteurs diesel -- Agent AUS 32 de réduction des NOx

General Information

Status
Published
Publication Date
11-Feb-2019
Current Stage
6060 - International Standard published
Start Date
05-Jan-2019
Completion Date
12-Feb-2019
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ISO 22241-1:2019 - Diesel engines -- NOx reduction agent AUS 32
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INTERNATIONAL ISO
STANDARD 22241-1
Second edition
2019-02
Diesel engines — NOx reduction agent
AUS 32 —
Part 1:
Quality requirements
Moteurs diesel — Agent AUS 32 de réduction des NOx —
Partie 1: Exigences de qualité
Reference number
ISO 22241-1:2019(E)
ISO 2019
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ISO 22241-1:2019(E)
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© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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ii © ISO 2019 – All rights reserved
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ISO 22241-1:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Designation ................................................................................................................................................................................................................ 2

5 Requirements and testing ........................................................................................................................................................................... 2

6 Handling, transportation and storage............................................................................................................................................ 2

7 Marking .......................................................................................................................................................................................................................... 2

Annex A (informative) Chemical characteristics...................................................................................................................................... 4

Annex B (informative) Precision of test methods ................................................................................................................................... 5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2019 – All rights reserved iii
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ISO 22241-1:2019(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO’s adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,

Propulsion, powertrain and powertrain fluids.

This second edition cancels and replaces the first edition (ISO 22241-1:2006), which has been technically

revised. The main changes compared to the previous edition are as follows:
— the test method for measuring urea content by refractive index was revised;

— an alternate test method for measuring trace amounts of phosphorous by ICP-OES was added (a

referee method is indicated); and
— the refractive index, nD20, limit values were revised.
A list of all parts in the ISO 22241 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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ISO 22241-1:2019(E)
Introduction

In order to protect the environment, keeping the air quality as clean as possible, exhaust emissions

regulations around the world have been strengthened considerably. In motor vehicles with diesel

engines, particulate matters (PM) and nitrogen oxide (NOx) emissions are the main concern, and

efforts have been focused on the development of technology which can reduce them effectively with

minimum fuel economy penalty. Selective catalytic reduction (SCR) converters using urea solution as

the reduction agent are considered to be a key technology for reducing NOx emissions. The quality of the

urea solution used for that technology needs to be specified to ensure reliable and stable operation of

the SCR converter systems. The ISO 22241 series provides the specifications for quality characteristics,

for handling, transportation and storage and for the refilling interface as well as the test methods,

needed by the manufacturers of motor vehicles and their engines, by converter manufacturers, by

producers and distributors of the urea solution and by fleet operators.

The urea solution (AUS 32) as specified in this document is commercially available and may exist under

various trade names .

1) Trade names of products AdBlue®, ARLA 32®, DEF, etc. are examples of suitable products available commercially.

This information is given for the convenience of users of this document and does not constitute an endorsement by

ISO of the products named.
© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 22241-1:2019(E)
Diesel engines — NOx reduction agent AUS 32 —
Part 1:
Quality requirements
1 Scope

This document specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea

solution) which is needed to operate selective catalytic reduction (SCR) converter systems in motor

vehicles with diesel engines. SCR co
...

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