As 2405-2005 Laboratory Glassware - Kjeldahl Flasks

7/31/2019 As 2405-2005 Laboratory Glassware - Kjeldahl Flasks

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AS 24052005

Australian Standard

Laboratory glasswareKjeldahl flasks

AS24052005


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This Australian Standard was prepared by Committee CH-001, LaboratoryGlassware and Related Apparatus. It was approved on behalf of the Council ofStandards Australia on 14 October 2005.This Standard was published on 28 October 2005.

The following are represented on Committee CH-001:

Australian Chamber of Commerce and Industry

National Association of Testing Authorit ies Australia

National Measurement Ins titute

Royal Australian Chemical Institute

Royal College of Pathologists of Australasia

Science Industry AustraliaUniversity of New South Wales

University of Sydney

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This Standard was issued in draft form for comment as DR 05085.


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AS 24052005

Australian Standard


Originated as AS 24051981.Second edition 2005.

COPYRIGHT

Standards Australia

All rights are reserved. No part of this work may be reproduced or copied in any form or by

any means, electronic or mechanical, including photocopying, without the written

permission of the publisher.

Published by Standards Australia, GPO Box 476, Sydney, NSW 2001, Australia

ISBN 0 7337 6963 2


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AS 24052005 2

PREFACE

This Standard was prepared by the Standards Australia Committee CH-001, Laboratory

Glassware and Related Apparatus to supersede AS 24051981, Laboratory glassware

Kjeldahl flasks.

The objective of this Standard is to ensure that the requirements for Kjeldahl flasks

generally used for digestion and distillation procedures in the determination of nitrogen are

achieved.

The objective of this revision is to reconfirm the Standard with minor changes including the

following:

(a) Referenced documents have been updated.

(b) The Standard has been brought into line with current editorial practices.

The term informative has been used in this Standard to define the application of the

appendix to which it applies. An informative appendix is only for information andguidance.


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3 AS 24052005

CONTENTS

Page

1 SCOPE........................................................................................................................ 4

2 REFERENCED DOCUMENTS.................................................................................. 4

3 DEFINITION.............................................................................................................. 4

4 CAPACITIES OF FLASKS........................................................................................ 4

5 MATERIAL................................................................................................................ 4

6 CONSTRUCTION...................................................................................................... 4

7 DIMENSIONS AND TOLERANCES. ....................................................................... 5

8 FLASKS WITH INTERCHANGEABLE CONICAL GLASS JOINTS ...................... 5

9 MARKING ................................................................................................................. 5

APPENDIX A CARE IN THE USE OF KJELDAHL FLASKS.............................................. 7


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AS 24052005 4

Standards Australia www.standards.com.au

STANDARDS AUSTRALIA

Australian Standard


1 SCOPE

This Standard specifies requirements for Kjeldahl flasks generally used for digestion and

distillation procedures in the determination of nitrogen.

2 REFERENCED DOCUMENTS

The following documents are referred to in this Standard:

AS

2409 Interchangeable conical ground glass joints

ISO

3585 Borosilicate glass 3.3Properties

3 DEFINITION

For the purpose of this Standard, the definition below applies.

3.1 Nominal capacity

The value which is closest to, but not greater than, the actual capacity of the flask to the

base of the neck.

4 CAPACITIES OF FLASKS

The nominal capacities of Kjeldahl flasks, in millilitres, shall be:

50, 100, 250, 500, 750, 1000.

5 MATERIAL

5.1 General

Flasks shall be made of borosilicate glass 3.3 (ISO 3585). They shall be as free as possible

from visible defects and internal stress.

NOTE: Directions for the care and use of Kjeldahl flasks are contained in Appendix A.

6 CONSTRUCTION

6.1 General

Flasks shall conform to the appropriate general shape shown in Figure 1.

6.2 Bulb

The shape of the bulb shall be approximately as shown in Figure 1. The lower half shall be

approximately hemispherical and the upper half shall have a gradual taper towards the neck.

6.3 Neck

The neck of the flask shall be substantially circular in cross-section. The top of the neckshall not be belled to any appreciable distance from the top of the flask and shall be

finished with a strengthening rim.


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As 2405-2005 Laboratory Glassware - Kjeldahl Flasks