BS-7020-15-1993 ISO-10203-1993.pdf
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1、BRITISH STANDARD BS 7020-15: 1993 ISO 10203: 1993 Analysis of iron ores Part 15: Methods for the determination of calcium content: flame atomic absorption spectrometric method UDC 553.31:543.422:546.41 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:54:01 GMT
2、+00:00 2006, Uncontrolled Copy, (c) BSI BS 7020-15:1993 This British Standard, having been prepared under the direction of the Iron and Steel Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1993 BSI 07-1999 The following BSI re
3、ferences relate to the work on this standard: Committee reference ISM/58 Draft for comment 91/35109 DC ISBN 0 580 22297 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Iron and Steel Standards Policy Committee (ISM/-) to Technical Comm
4、ittee ISM/58, upon which the following bodies were represented: British Steel Industry Institution of Mining and Metallurgy Coopted members The following body was also represented in the drafting of the standard, through subcommittees and panels: British Ceramic Research Ltd. Amendments issued since
5、 publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:54:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7020-15:1993 BSI 07-1999i Contents Page Committees responsible Inside front cover National foreword ii 1Scope1 2Normative ref
6、erences1 3Principle1 4Reagents1 5Apparatus2 6Sampling and samples2 7Procedure2 8Expression of results4 9Test report5 Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples6 Annex B (informative) Derivation of repeatability and permissible tolerance eq
7、uations7 Annex C (informative) Precision data obtained by international analytical trials8 Figure C.1 Least-squares fit of precison against X for calcium8 Table 1 Dilution guide for test solution5 Table B.1 Calcium contents of test samples7 List of referencesInside back cover Licensed Copy: London S
8、outh Bank University, London South Bank University, Fri Dec 08 13:54:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7020-15:1993 ii BSI 07-1999 National foreword This Part of BS 7020 has been prepared under the direction of the Iron and Steel Standards Policy Committee and is identical with ISO 10
9、203:1992 Iron ores Determination of calcium content Flame atomic absorption spectrometric method, published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 648, to which normative reference is made in the text, and has decided t
10、hat they are acceptable for use in conjunction with this standard. A related British Standard to ISO 648:1977 is BS 1583:1986 Specification for one-mark pipettes. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
11、 their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International standardCorresponding British Standard ISO 1042:1983BS 1792:1982 Specification for one-mark volumetric flasks (Identical) BS 5660 Methods of sampli
12、ng iron ores ISO 3081:1986Part 1:1987 Manual method of increment sampling (Identical) ISO 3082:1987Part 2:1987 Mechanical method of increment sampling and sample preparation (Identical) ISO 3083:1986BS 5661:1987 Method for preparation of samples of iron ores by manual means (Identical) ISO 7764:1985
13、BS 7020 Analysis of iron ores Part 1:1988 Method for the preparation of pre-dried test samples for chemical analysis (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover. This standard has been
14、updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:54:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7020-15:1993 BS
15、I 07-19991 1 Scope This International Standard specifies a flame atomic absorption spectrometric method for the determination of the calcium content of iron ores. This method is applicable to calcium contents between 0,01 % (m/m) and 10,0 % (m/m) in natural iron ores, iron ore concentrates and agglo
16、merates, including sinter products. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
17、 parties to agreements based on this International Standard 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 648:1977, Laboratory glassware On
18、e-mark pipettes. ISO 1042:1983, Laboratory glassware One-mark volumetric flasks. ISO 3081:1986, Iron ores Increment sampling Manual method. ISO 3082:1987, Iron ores Increment sampling and sample preparation Mechanical method. ISO 3083:1986, Iron ores Preparation of samples Manual method. ISO 7764:19
19、85, Iron ores Preparation of predried test samples for chemical analysis. 3 Principle Decomposition of the test portion by treatment with hydrochloric acid and a small amount of nitric acid. Evaporation to dehydrate silica, followed by dilution and filtration. Ignition of the residue and removal of
20、silica by evaporation with hydrofluoric and sulfuric acids. Fusion with sodium carbonate and dissolution of the cooled melt in the filtrate. Aspiration of the solution obtained into the flame of an atomic absorption spectrometer using a dinitrogen oxide-acetylene burner. Comparison of the absorbance
21、 values obtained for calcium with those obtained from the calibration solutions. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Sodium carbonate (Na2CO3), anhydrous. 4.2 Hydrochloric acid, 1,19 g/ml. 4.3 Hy
22、drochloric acid, 1,19 g/ml, diluted 1 + 9. 4.4 Nitric acid, 1,4 g/ml. 4.5 Hydrofluoric acid, 1,13 g/ml, 40 % (m/m), or 1,185 g/ml, 48 % (m/m). 4.6 Sulfuric acid, 1,84 g/ml, diluted 1 + 1. 4.7 Background solution Dissolve 10 g of pure iron wire minimum purity 99,9 % (m/m), of calcium content less tha
23、n 0,0002 % (m/m) in 50 ml of hydrochloric acid (4.2) and oxidize by adding nitric acid (4.4) drop by drop. Evaporate until a syrupy consistency is obtained. Add 20 ml of hydrochloric acid (4.2) and dilute to 200 ml with water. Dissolve 17 g of sodium carbonate (4.1) in water, add carefully to the ir
24、on solution and heat to remove carbon dioxide. Transfer the cooled solution to a 1 000 ml one-mark volumetric flask, dilute to volume with water and mix. 4.8 Lanthanum chloride solution Dissolve 50 g of lanthanum chloride (LaCl3.xH2O) of calcium content less than 0,002 % (m/m) in 50 ml of hydrochlor
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