ISO 22875-2008 Nuclear energy - Determination of chlorine and fluorine in uranium dioxide powder and sintered pellets《核能 二氧化铀粉末和烧结颗粒中氯和氟的测定》.pdf
《ISO 22875-2008 Nuclear energy - Determination of chlorine and fluorine in uranium dioxide powder and sintered pellets《核能 二氧化铀粉末和烧结颗粒中氯和氟的测定》.pdf》由会员分享,可在线阅读,更多相关《ISO 22875-2008 Nuclear energy - Determination of chlorine and fluorine in uranium dioxide powder and sintered pellets《核能 二氧化铀粉末和烧结颗粒中氯和氟的测定》.pdf(18页珍藏版)》请在麦多课文档分享上搜索。
1、 Reference numberISO 22875:2008(E)ISO 2008INTERNATIONAL STANDARD ISO22875First edition2008-01-15Nuclear energy Determination of chlorine and fluorine in uranium dioxide powder and sintered pellets nergie nuclaire Dtermination du chlore et du fluor dans les poudres de dioxyde duranium et les pastille
2、s frittes ISO 22875:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes 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
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4、nd 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
5、 address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 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 eithe
6、r ISO at the address below or ISOs 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedISO 22875:2008(E) ISO 20
7、08 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents 1 5 Apparatus 3 6 Procedure 4 7 Test report . 9 Bibliography . 10 ISO 22875:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Stan
8、dardization) 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
9、 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 S
10、tandards 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
11、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 22
12、875 was prepared by Technical Committee ISO/TC 85, Nuclear energy, Subcommittee SC 5, Nuclear fuel technology. ISO 22875:2008(E) ISO 2008 All rights reserved vIntroduction This International Standard describes a method for determining the chlorine and fluorine concentrations in uranium dioxide and i
13、n sintered fuel pellets by pyrohydrolysis of samples, followed either by liquid ion-exchange chromatography or by selective electrode measurement of chlorine and fluorine ions. Many ion-exchange chromatography systems and ion-selective electrode measurement systems are available; the equipment and o
14、perating procedure are, therefore, not described in detail. INTERNATIONAL STANDARD ISO 22875:2008(E) ISO 2008 All rights reserved 1Nuclear energy Determination of chlorine and fluorine in uranium dioxide powder and sintered pellets 1 Scope This International Standard describes a method for determini
15、ng chlorine and fluorine in uranium dioxide powder and sintered pellets. It is applicable for the analysis of samples with a mass fraction of chlorine from 5 g/g to 500 g/g and with a mass fraction of fluorine from 2 g/g to 500 g/g. 2 Normative references ISO 3696, Water for analytical laboratory us
16、e Specification and test methods ISO 9892:1992, Uranium metal, uranium dioxide powder and pellets, and uranyl nitrate solutions Determination of fluorine content Fluoride ion selective electrode method 3 Principle The samples are pyrohydrolysed at 900 C to 1 000 C in a tubular furnace with wet air o
17、r steam heated to the same temperature. Chlorine and fluorine are trapped as halogenated acids and entrained in an aqueous solution. Two measurement methods may be used to measure the chlorine and fluorine ions: a) liquid ion-exchange chromatography; b) selective electrode measurement. 4 Reagents Us
18、e reagents of recognized analytical grade. 4.1 Water, complying with at least grade 1 in accordance with ISO 3696. 4.2 Anhydrous sodium chloride (NaCl). 4.3 Anhydrous sodium fluoride (NaF). 4.4 Sodium carbonate (Na2CO3). 4.5 Anhydrous sodium bicarbonate (NaHCO3). 4.6 Glacial acetic acid (CH3COOH), (
19、CH3COOH) = 1,06 g/ml. 4.7 Potassium acetate (CH3COOK). ISO 22875:2008(E) 2 ISO 2008 All rights reserved4.8 Concentrated eluant solution, c(Na2CO3) = 0,018 mol/l and c(NaHCO3) = 0,017 mol/l. Dissolve 1,908 g of Na2CO3(4.4) and 1,428 g of NaHCO3(4.5) in water (4.1). Pour into a 1 l volumetric flask. D
20、ilute to 1 l with water (4.1). Homogenize. 4.9 Standard eluant solution, Add 100 ml of concentrated eluant solution (4.8) to a 1 l volumetric flask. Dilute to 1 l with water (4.1). Homogenize. 4.10 Make-up eluant solution, c(Na2CO3) = 0,09 mol/l and c(NaHCO3) = 0,085 mol/l. Dissolve 9,540 g of Na2CO
21、3(4.4) and 7,140 g of NaHCO3(4.5) in water (4.1) Pour into a 1 l volumetric flask. Dilute to 1 l with water (4.1). Homogenize. 4.11 Buffer solution, c(CH3COOH) = 0,005 mol/l and c(CH3COOK) = 0,005 mol/l. Pour 250 l of acetic acid (4.6) and 0,50 g of potassium acetate (4.7) into a 1 l polyethylene vo
22、lumetric flask. Dilute to 1 l with water (4.1). Homogenize. The concentration of the buffer solution can alternatively be chosen between 0,001 mol/l and 0,1 mol/l. 4.12 Chloride reference solution, (Cl) = 1 g/l. Dissolve 1,648 g of dry anhydrous sodium chloride (4.2) in water (4.1). Pour into a 1 l
23、volumetric flask. Dilute to 1 l with water (4.1). Homogenize. To achieve dry sodium salt, heat at 120 C for 4 h just before use and keep in exicator. 4.13 Chloride reference solution, (Cl) = 0,1 g/l. Pipette 10 ml reference solution (4.12) into a 100 ml volumetric flask. Dilute to 100 ml with water
24、(4.1). Homogenize. 4.14 Chloride reference solution, (Cl) = 0,01 g/l. Pipette 10 ml reference solution (4.13) into a 100 ml volumetric flask. Dilute to 100 ml with water (4.1) Homogenize. Solutions may be stored for two months. 4.15 Fluoride reference solution, (F) = 1 g/l. Dissolve 2,210 0,001 g of
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