ISO 21910-1:2020
(Main)Fine bubble technology — Characterization of microbubbles — Part 1: Off-line evaluation of size index
Fine bubble technology — Characterization of microbubbles — Part 1: Off-line evaluation of size index
This document specifies the evaluation method for the size index of microbubbles in microbubble dispersion. It is only applicable to microbubbles with or without shell in water within the range from 1 μm to 100 μm. It describes the sampling methods from the point generating or dispersing microbubbles in the retention container to the detecting point of the measuring instruments.
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INTERNATIONAL ISO
STANDARD 21910-1
First edition
2020-01
Fine bubble technology —
Characterization of microbubbles —
Part 1:
Off-line evaluation of size index
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Requirements on the sample . 2
4.2 Requirements on the sample transfer and measurement system . 2
5 Measuring instruments . 3
6 Environment . 3
7 Sample transfer and measurement system . 3
7.1 General . 3
7.2 System structure . 3
7.3 Arrangement of components . 3
7.3.1 Position of the inlet tube mouth . 3
7.3.2 Position of the measuring instrument . 3
7.4 Retention container . 4
7.4.1 General. 4
7.4.2 Configuration requirements for retention container . 4
7.5 Loading tube . 5
7.5.1 Loading tube inner diameter. 5
7.5.2 Loading tube length . 5
7.5.3 Curvature of the loading tube . 5
7.5.4 Surface roughness . 5
7.5.5 Loading tube materials . . 5
7.5.6 Suppression of loading tube sway . 5
7.6 Loading pump . 5
7.6.1 General. 5
7.6.2 Flow rate (Flow velocity). 5
7.7 Retention time . 6
7.8 Dispersion before/during sampling for microbubbles with shell . 6
8 Procedure. 7
9 Data acquisition. 7
9.1 General . 7
9.2 Measurement time . 8
9.3 Number of measurements . 8
9.4 Size category . 8
9.5 Results . 8
9.6 Calibration and traceability . 8
9.7 Uncertainty evaluation . 8
10 Correction . 8
10.1 General . 8
10.2 Reserved water used for blank preparation . 8
11 Report . 9
Annex A (informative) Example of microbubbles without shell measurement using
dynamic image analysis .10
Annex B (informative) Effect of setting arrangement .14
Annex C (informative) Example of corrected data by subtraction of blank water .18
Annex D (informative) Example of method repeatability.19
Annex E (informative) Example of comparisons among 3 measurement techniques .20
Bibliography .22
iv © ISO 2020 – All rights reserved
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 of 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 281, Fine bubble technology.
A list of all parts in the ISO 21910 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.
Introduction
Recent development in the fine bubble technology expands its market, such as cleaning, water
treatment, agriculture and aquaculture as well as biomedical. Above all, the application of microbubble
technology accelerates the market penetration.
Many measurement technologies have been historically developed to assess the characteristics
of microbubbles and are now used in various application fields. However, the dynamic nature of
microbubbles makes it hard for the users to report their measurement results with confidence. The
low stability of microbubbles that includes shrinking, deformation, coalescence and dissolution of
individual microbubble can require a specific sampling procedure and short measurement time.
This document is intended to specify an evaluation method for size index of microbubbles in water to be
used in a measurement laboratory. The application of the document to measurement system will yield
comparable results over an application field, as far as the specified types of measuring instruments are
equipped and the specified sampling procedures are met. Since the comparability relevance depends on
the sampling procedures and the measurement environments, each measurement can require relevant
descriptions. The specifications of the measuring instruments are described in other standards or the
individual operation instruction manuals.
vi © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 21910-1:2020(E)
Fine bubble technology — Characterization of
microbubbles —
Part 1:
Off-line evaluation of size index
1 Scope
This document speci
...
INTERNATIONAL ISO
STANDARD 21910-1
First edition
2020-01
Fine bubble technology —
Characterization of microbubbles —
Part 1:
Off-line evaluation of size index
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Requirements on the sample . 2
4.2 Requirements on the sample transfer and measurement system . 2
5 Measuring instruments . 3
6 Environment . 3
7 Sample transfer and measurement system . 3
7.1 General . 3
7.2 System structure . 3
7.3 Arrangement of components . 3
7.3.1 Position of the inlet tube mouth . 3
7.3.2 Position of the measuring instrument . 3
7.4 Retention container . 4
7.4.1 General. 4
7.4.2 Configuration requirements for retention container . 4
7.5 Loading tube . 5
7.5.1 Loading tube inner diameter. 5
7.5.2 Loading tube length . 5
7.5.3 Curvature of the loading tube . 5
7.5.4 Surface roughness . 5
7.5.5 Loading tube materials . . 5
7.5.6 Suppression of loading tube sway . 5
7.6 Loading pump . 5
7.6.1 General. 5
7.6.2 Flow rate (Flow velocity). 5
7.7 Retention time . 6
7.8 Dispersion before/during sampling for microbubbles with shell . 6
8 Procedure. 7
9 Data acquisition. 7
9.1 General . 7
9.2 Measurement time . 8
9.3 Number of measurements . 8
9.4 Size category . 8
9.5 Results . 8
9.6 Calibration and traceability . 8
9.7 Uncertainty evaluation . 8
10 Correction . 8
10.1 General . 8
10.2 Reserved water used for blank preparation . 8
11 Report . 9
Annex A (informative) Example of microbubbles without shell measurement using
dynamic image analysis .10
Annex B (informative) Effect of setting arrangement .14
Annex C (informative) Example of corrected data by subtraction of blank water .18
Annex D (informative) Example of method repeatability.19
Annex E (informative) Example of comparisons among 3 measurement techniques .20
Bibliography .22
iv © ISO 2020 – All rights reserved
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 of 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 281, Fine bubble technology.
A list of all parts in the ISO 21910 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.
Introduction
Recent development in the fine bubble technology expands its market, such as cleaning, water
treatment, agriculture and aquaculture as well as biomedical. Above all, the application of microbubble
technology accelerates the market penetration.
Many measurement technologies have been historically developed to assess the characteristics
of microbubbles and are now used in various application fields. However, the dynamic nature of
microbubbles makes it hard for the users to report their measurement results with confidence. The
low stability of microbubbles that includes shrinking, deformation, coalescence and dissolution of
individual microbubble can require a specific sampling procedure and short measurement time.
This document is intended to specify an evaluation method for size index of microbubbles in water to be
used in a measurement laboratory. The application of the document to measurement system will yield
comparable results over an application field, as far as the specified types of measuring instruments are
equipped and the specified sampling procedures are met. Since the comparability relevance depends on
the sampling procedures and the measurement environments, each measurement can require relevant
descriptions. The specifications of the measuring instruments are described in other standards or the
individual operation instruction manuals.
vi © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 21910-1:2020(E)
Fine bubble technology — Characterization of
microbubbles —
Part 1:
Off-line evaluation of size index
1 Scope
This document speci
...
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