BS-7455-5-1991 ISO-7530-5-1990.pdf
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1、BRITISH STANDARD BS 7455-5: 1991 ISO 7530-5: 1990 Analysis of nickel alloys by flame atomic absorption spectrometry Part 5: Method for the determination of iron Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:00:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
2、S 7455-5:1991 This British Standard, having been prepared under the direction of the Non-ferrous Metals Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 28 June 1991 BSI 12-1999 The following BSI references relate to the work on this stand
3、ard: Committee reference NFM/10 Draft for comment 89/47728 DC ISBN 0 580 19779 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Non-ferrous Metals Standards Policy Committee (NFM/-) to Technical Committee NFM/10, upon which the followin
4、g bodies were represented: British Non-ferrous Metals Federation British Steel Industry Department of Trade and Industry (Laboratory of the Government Chemist) Engineering Equipment and Materials Users Association Ministry of Defence Nickel Development Institute Non-ferrous Metal Stockists Process P
5、lant Association Stainless Steel Fabricators Association of Great Britain Coopted members Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:00:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7455-5:1991
6、BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Principle1 4Reagents1 5Apparatus1 6Sampling and sample preparation1 7Procedure1 8Expression of results2 9Test report2 Table 1 Nominal composition of test samples2 Table 2 Results o
7、f statistical analysis2 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:00:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7455-5:1991 ii BSI 12-1999 National foreword This Part of BS 7455 has been prepared under t
8、he direction of the Non-ferrous Metals Standards Policy Committee. It is identical with ISO 7530-5 “Nickel alloys Flame atomic absorption spectrometric analysis Part 5:1990 Determination of iron content”, published by the International Organization for Standardization (ISO). At present this British
9、Standard consists of six Parts all concerned with methods for flame spectrometric analysis of nickel alloys. Further International Standards are in preparation on the same subject and when available, these will be published as further Parts of this British Standard. A British Standard does not purpo
10、rt to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO
11、5725:1986BS 5497 Precision of test methods Part 1:1987 Guide for the determination of repeatability and reproducibility for a standard test method by inter-laboratory tests (Identical) ISO 7530-1:1990BS 7455 Analysis of nickel alloys by flame atomic absorption spectrometry Part 1:1991 General requir
12、ements and sample dissolution (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be in
13、dicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:00:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7455-5:1991 BSI 12-19991 1 Scope This part of ISO 7530 specifies a flame atomic absorption spectromet
14、ric method for the determination of iron in the range of 0,01 % (m/m) to 4 % (m/m) in nickel alloys. Typical compositions of some nickel alloys are given in ISO 7530-1, Annex B. The general requirements concerning the apparatus, sampling, dissolution of the test sample, atomic absorption measurement
15、s, calculations and test report are given in ISO 7530-1. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 7530. At the time of publication, the editions indicated were valid. All standards are subject t
16、o revision, and parties to agreements based on this part of ISO 7530 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5725:1986, Precision of
17、test methods Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests. ISO 7530-1:, Nickel alloys Flame atomic absorption spectrometric analysis Part 1: General requirements and sample dissolution1). 3 Principle Dissolution of a test portion in acid and
18、 aspiration of the test solution into an air-acetylene flame of an atomic absorption spectrometer. Measurement of the absorbance of the resonance line energy from the spectrum of iron and comparison with that of calibration solutions at a wavelength of 248,3 nm. 4 Reagents In addition to the reagent
19、s listed in ISO 7530-1, the following special reagents are required. 4.1 Strontium chloride, solution. Transfer 113,5 g of strontium chloride hexahydrate (SrCl26H2O) to a 600 ml beaker, dissolve in 400 ml of hot water (50 C to 60 C), cool and transfer to a 1 000 ml one-mark volumetric flask. Make up
20、 to the mark with water and mix. The strontium chloride should be free of heavy metals. 4.2 Iron, standard reference solution (1,000 g/l). Weigh, to the nearest 0,001 g, 1,000 g of iron metal of 99,9 % (m/m) minimum purity and transfer to a 400 ml beaker. Add 30 ml of hydrochloric acid (20= 1,18 g/m
21、l) diluted 1 + 1. Heat to initiate the reaction and complete dissolution. Cool to about 50 C, cautiously add 1 ml of hydrogen peroxide (4.4) and bring to the boil to oxidize the iron. Cool, transfer to a 1 000 ml one-mark volumetric flask and add 35 ml of hydrochloric acid (20= 1,18 g/ml). Make up t
22、o the mark with water, mix and store in a polyethylene bottle. 4.3 Iron, standard solution (50 mg/l). Pipette 50 ml of the iron standard reference solution (4.2) into a 1 000 ml one-mark volumetric flask and add 50 ml of hydrochloric acid (20= 1,18 g/ml). Make up to the mark with water, mix and stor
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