ISO 22725-2007 Nickel alloys - Determination of tantalum - Inductively coupled plasma atomic emission spectrometric method《镍合金 钽测定 感应耦合等离子体原子发射光谱法》.pdf
《ISO 22725-2007 Nickel alloys - Determination of tantalum - Inductively coupled plasma atomic emission spectrometric method《镍合金 钽测定 感应耦合等离子体原子发射光谱法》.pdf》由会员分享,可在线阅读,更多相关《ISO 22725-2007 Nickel alloys - Determination of tantalum - Inductively coupled plasma atomic emission spectrometric method《镍合金 钽测定 感应耦合等离子体原子发射光谱法》.pdf(16页珍藏版)》请在麦多课文档分享上搜索。
1、 Reference numberISO 22725:2007(E)ISO 2007INTERNATIONAL STANDARD ISO22725First edition2007-11-15Nickel alloys Determination of tantalum Inductively coupled plasma atomic emission spectrometric method Alliages de nickel Dosage du tantale Mthode par spectromtrie dmission atomique avec source plasma in
2、duit par haute frquence ISO 22725:2007(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 performi
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4、ile can be found 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 Secr
5、etariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 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 writ
6、ing from either 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 2007 All rights reservedISO 22725:
7、2007(E) ISO 2007 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Reagents 2 5 Apparatus 3 6 Sampling and sample preparation 4 7 Procedure 4 7.1 Test portion . 4 7.2 Preparation of test solution, TTa. 4 7.3 Optimisation of spectrometer 4 7.4 Pr
8、e-determination of the test solution 5 7.5 Preparation of calibration solutions for bracketing, Kl,Taand Kh,Ta. 5 7.6 Measurement of test solutions 6 8 Expression of results . 6 8.1 Method of calculation. 6 8.2 Precision 6 8.3 Trueness 7 9 Test report . 7 Annex A (normative) Checking the performance
9、 of an ICP instrument . 8 Annex B (informative) Notes on the test programme . 10 ISO 22725:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
10、ational 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
11、 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 with the rules given in the ISO/IEC Directives, Part 2. The main task of technical
12、 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 approval by at least 75 % of the member bodies casting a vote. Attention is drawn to
13、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 22725 was prepared by Technical Committee ISO/TC 155, Nickel and nickel alloys, Subcommittee SC 3, Analysis of nickel,
14、ferronickel and nickel alloys. INTERNATIONAL STANDARD ISO 22725:2007(E) ISO 2007 All rights reserved 1Nickel alloys Determination of tantalum Inductively coupled plasma atomic emission spectrometric method 1 Scope This International Standard specifies an inductively coupled plasma atomic emission sp
15、ectrometric method for the determination of the mass fraction of tantalum between 0,1 % and 5 % in nickel alloys. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refere
16、nces, the latest edition of the referenced document (including any amendments) applies. ISO 648:1), Laboratory glassware Single volume pipettes ISO 1042:1998, Laboratory glassware One-mark volumetric flasks ISO 3696:1987, Water for analytical laboratory use Specification and test methods ISO 5725-1:
17、1994, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard me
18、asurement method ISO 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision of a standard measurement method 3 Principle Dissolution of a test portion in a mixture of hydrofluoric, hydrochloric, nitric and phosphoric acid and
19、fuming after addition of perchloric acid. Addition of hydrofluoric acid and, if desired, of an internal reference element and dilution of the solution to known volume. Nebulization of the solution into an inductively coupled plasma atomic emission spectrometer and measurement of the intensity of the
20、 emitted light from tantalum, and eventually from the internal reference element, simultaneously. An example of the analytical line for tantalum is given in Table 1. The method uses a calibration based on a very close matrix-matching of the calibration solutions to the sample and bracketing of the m
21、ass fractions between 0,75 and 1,25 of the approximate concentration of tantalum in the sample to be analysed. The concentration of all elements in the sample has, therefore, to be approximately known. If the concentrations are not known, the sample has to be analysed by some semi-quantitative metho
22、d. The advantage of this procedure is that all possible interferences from the matrix will be automatically compensated, which will result in high accuracy. This is most important for spectral interferences, 1) To be published. (Revision of ISO 648:1977) ISO 22725:2007(E) 2 ISO 2007 All rights reser
23、vedwhich can be severe in very highly alloyed metals. All possible interferences shall be kept at a minimum level. Therefore it is essential that the spectrometer used meets the performance criteria specified in the method for the selected analytical lines. The line corresponding to 240,06 nm has be
24、en carefully investigated. If other lines are used, they shall be carefully checked. The analytical line for the internal standard should be selected carefully. The use of Scandium at 363,07 nm is recommended. This line is interference-free for the elements and concentrations generally found in nick
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