BS-ISO-15093-2008.pdf
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1、BRITISH STANDARD BS ISO 15093:2008 Jewellery Determination of precious metals in 999 0/00 gold, platinum and palladium jewellery alloys Difference method using inductively coupled plasma optical emission spectroscopy (ICP-OES) ICS 39.060 ? Licensed Copy: London South Bank University, South Bank Univ
2、ersity, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI BS ISO 15093:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2008 BSI 2008 ISBN 978 0 580 57229 6 National foreword This British Standard is the UK implementation of ISO 150
3、93:2008. The UK participation in its preparation was entrusted to Technical Committee STI/53, Specifications and test methods for jewellery and horology. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include al
4、l the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Licensed Copy: London South Bank University, South Bank Universit
5、y, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI Reference number ISO 15093:2008(E) INTERNATIONAL STANDARD ISO 15093 First edition 2008-08-15 Jewellery Determination of precious metals in 999 gold, platinum and palladium jewellery alloys Difference method using inductively coupled plasma optical emis
6、sion spectroscopy (ICP-OES) Joaillerie, bijouterie Dosage des mtaux prcieux dans les alliages dor, de platine et de palladium 999 pour la joaillerie, bijouterie Mthode de la diffrence utilisant la spectromtrie dmission plasma induit par haute frquence (ICP-OES) BS ISO 15093:2008 Licensed Copy: Londo
7、n South Bank University, South Bank University, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, South Bank University, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI iii Foreword ISO (the International Organization for Standardization) is a worldwide federa
8、tion 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 committ
9、ee. 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 Standards are drafted in accordance
10、 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 International Standard requires ap
11、proval 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 15093 was prepared by Technical Comm
12、ittee ISO/TC 174, Jewellery. BS ISO 15093:2008 Licensed Copy: London South Bank University, South Bank University, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, South Bank University, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI 1 Jewellery Determina
13、tion of precious metals in 999 gold, platinum and palladium jewellery alloys Difference method using inductively coupled plasma optical emission spectroscopy (ICP-OES) 1 Scope This International Standard specifies an analytical procedure for the determination of either platinum in platinum jewellery
14、 alloys, gold in gold jewellery alloys or palladium in palladium jewellery alloys, with a nominal content of each precious metal of 999 (parts per thousand), by measuring specific elements listed in Tables A.1, A.2 and A.3. 2 Normative references The following referenced documents are indispensable
15、for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11596, Jewellery Sampling of precious metal alloys for and in jewellery and associated products 3
16、Principle The samples of the precious metal alloy are weighed and dissolved in aqua regia to prepare a 10 g/l solution. The impurities are determined by inductively coupled plasma optical emission spectroscopy (ICP-OES), and the precious metal content is obtained by subtraction of the total content
17、of impurities in the sample from 1 000 . 4 Sampling The sampling procedure shall be performed in accordance with ISO 11596. NOTE Equivalent methods can be used, as described in ISO 5725-1. For coated articles, appropriate precautions that have been agreed upon shall be taken to exclude the coating f
18、rom the determination. 5 Reagents During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 5.1 Hydrochloric acid (HCl); 20 = 1,19 g/cm3; 37 % HCl (mass fraction). BS ISO 15093:2008 Licensed Copy: London Sou
19、th Bank University, South Bank University, 16/11/2008 11:44, Uncontrolled Copy, (c) BSI 2 5.2 Nitric acid (HNO3); 20 = 1,40 g/cm3; 67 % HNO3 (mass fraction). 5.3 Aqua regia (to be prepared just before use). To one part by volume of HNO3 (5.2), add three parts by volume of HCl (5.1) and mix thoroughl
20、y. 5.4 Mixed stock solutions Using appropriate certified reagents, the following mixed stock solutions shall be prepared in order to obtain the indicated concentrations. 5.4.1 Nitric stock solution (chloride free): Ag, Bi, Pb (100 mg/l each) in 2 mol/l of HNO3 (5.2). 5.4.2 Hydrochloric stock solutio
21、n (nitrate free): Sn, Ti (100 mg/l each) in 2 mol/l of HCl (5.1). 5.4.3 Acid stock solution (may contain both chlorides and nitrates): all remaining relevant elements (100 mg/l each) in 1 mol/l of HCl (5.1) and 1 mol/l of HNO3 (5.2). Any desired element may be added in the nitric stock solution (5.4
22、.1) or the hydrochloric stock solution (5.4.2) instead of the acid stock solution (5.4.3), provided that no chlorides are introduced in the nitric stock solution (5.4.1) and no nitrates are introduced in the hydrochloric stock solution (5.4.2). 5.5 Precious metal wire or sheet of gold, platinum or p
23、alladium of 999,9 minimum purity. The content of each impurity shall be determined. 6 Apparatus Customary laboratory apparatus and the following. 6.1 ICP optical emission spectrometer, with: fixed and/or scanning channels; an optical resolution of 0,02 nm for the relevant elements and a detection li
24、mit of 0,05 mg/l or better; the capability of background correction. NOTE Annex A specifies preferably used wavelengths. 6.2 Analytical balance accurate to 0,01 mg. 7 Procedure 7.1 Test solution For each sample to be analysed, two test solutions shall be prepared as follows. Weigh (500 2,5) mg of th
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