BS ISO 18191-2015 Water quality Determination of pHt in sea water Method using the indicator dye $im-cresol purple《水质 海水中pHt的测定 间甲酚紫指示剂染料法》.pdf
《BS ISO 18191-2015 Water quality Determination of pHt in sea water Method using the indicator dye $im-cresol purple《水质 海水中pHt的测定 间甲酚紫指示剂染料法》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 18191-2015 Water quality Determination of pHt in sea water Method using the indicator dye $im-cresol purple《水质 海水中pHt的测定 间甲酚紫指示剂染料法》.pdf(22页珍藏版)》请在麦多课文档分享上搜索。
1、BSI Standards PublicationBS ISO 18191:2015W a t e r q u a l i t y D e t e r m i n a t i o n of pHtin sea water Method using the indicator dyem-cresol purpleBS ISO 18191:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18191:2015.The UK participation in its
2、preparation was entrusted to Technical Committee EH/3/2, Physical chemical and biochemical methods.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are resp
3、onsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 79390 5 ICS 13.060.50 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Stan
4、dards Policy and Strategy Committee on 30 September 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 18191:2015 ISO 2015Water quality Determination of pHt in sea water Method using the indicator dye m-cresol purpleQualit de leau Dtermination du pHt dans leau de m
5、er Mthode utilisant lindicateur color au pourpre de m-crsolINTERNATIONAL STANDARDISO18191First edition2015-09-01Reference numberISO 18191:2015(E)BS ISO 18191:2015ISO 18191:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless
6、 otherwise specified, 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 add
7、ress below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 18191:2015ISO 18191:2015(E)Foreword ivIntroduction v1 Scope . 12 Terms and defin
8、itions . 13 Principle 24 Reagents 25 Apparatus . 36 Sampling 47 Procedure. 48 Calculation and expression of results . 48.1 Correction of measured absorbances 48.2 Calculation of the pHtof the sea water and indicator . 58.3 Correction for pHtchange resulting from addition of the indicator . 6Annex A
9、(informative) Performance data . 7Annex B (informative) Storage stability 8Bibliography .10 ISO 2015 All rights reserved iiiContents PageBS ISO 18191:2015ISO 18191:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO memb
10、er 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, government
11、al 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 a
12、re 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
13、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
14、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 meaning of ISO specific terms and expressions related to conformity assess
15、ment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 147, Water quality, Subcommittee SC 2, Physical, chemical and biochemical
16、methods.iv ISO 2015 All rights reservedBS ISO 18191:2015ISO 18191:2015(E)IntroductionThe greenhouse effect induced by anthropogenic carbon dioxide, CO2, in the atmosphere is one of the serious global environmental issues. A key factor controlling the atmospheric CO2is its absorption into the ocean.
17、As a result of the absorption, the pH in the upper layer of the ocean is observed to have fallen gradually, and its influence on the living organisms is a matter of concern all over the world.On the other hand, carbon capture and storage (CCS) technology is considered as a useful means of reducing t
18、he CO2emissions from fossil fuel. When ocean environment such as sub-seabed aquifer is selected as a storage site, the monitoring of carbonate system including pH in sea water becomes very important. The analytical method for pHtin sea water (the total hydrogen ion concentration pH scale) samples re
19、quires specific conditions and techniques essential to the precise and accurate determination. This International Standard describes a method for the determination of pHtin sea water with the repeatability less than 0,003.This method will provide international communities accurate data sets on pHtin
20、 sea water being compatible with each other. This is the base of national and international operational observation or monitoring programs of the oceanic carbonate system as well as individual research works. ISO 2015 All rights reserved vBS ISO 18191:2015BS ISO 18191:2015Water quality Determination
21、 of pHt in sea water Method using the indicator dye m-cresol purpleWARNING Persons using this International Standard should be familiar with normal laboratory practice. This International Standard does not purport to address all of the safety problems, if any, associated with its use. It is the resp
22、onsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.IMPORTANT It is absolutely essential that tests conducted in accordance with this International Standard be carried out by suitably qualified staff.1 ScopeThis
23、 International Standard specifies a spectrophotometric determination of the pHtof sea water on the total hydrogen ion concentration pH scale using the indicator dye m-cresol purple. The total hydrogen ion concentration, H+t, is expressed as moles per kilogram of sea water. The method is suitable for
24、 assaying oceanic levels of pHt7,4 to 8,2 for normal sea water of practical salinity ranging from 20 to 40.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1total hydrogen ion concentration H+thydrogen ion concentration including the contribution
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