BS-7020-18-1993 ISO-10204-1992.pdf
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1、BRITISH STANDARD BS 7020-18: 1993 ISO 10204: 1992 Analysis of iron ores Part 18: Methods for the determination of magnesium content: flame atomic absorption spectrometric method UDC 553.31:543.22:546.46 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:54:01 GM
2、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 7020-18:1993 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 r
3、eferences relate to the work on this standard: Committee reference ISM/58 Draft for comment 91/35110 DC ISBN 0 580 22299 3 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 Com
4、mittee 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 sinc
5、e 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 7020-18:1993 BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative refe
6、rences1 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 equ
7、ations7 Annex C (informative) Precision data obtained by international analytical trials7 Figure C.1 Least-squares fit of precision against X for magnesium7 Table 1 Dilution guide for test solution4 Table B.1 Magnesium contents of test samples7 List of referencesInside back cover Licensed Copy: Lond
8、on South Bank University, London South Bank University, Fri Dec 08 13:54:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7020-18:1993 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 IS
9、O 10204:1992 Iron ores Determination of magnesium 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 dec
10、ided that 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 responsib
11、le 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 1042:1983BS 1792:1982 Specification for one-mark volumetric flasks (Identical) BS 5660 Methods of
12、sampling 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 776
13、4:1985BS 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
14、 been 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 7020-18:1
15、993 BSI 07-19991 1 Scope This International Standard specifies a flame atomic absorption spectrometric method for the determination of the magnesium content of iron ores. This method is applicable to magnesium contents between 0,01 % (m/m) and 3,0 % (m/m) in natural iron ores, iron ore concentrates
16、and agglomerates, 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 revi
17、sion, and 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 gla
18、ssware One-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. IS
19、O 7764:1985, 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 re
20、moval of 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 an air-acetylene burner. Comparison of the absorbance va
21、lues obtained for magnesium with those obtained from the calibration solutions. NOTE 1A dinitrogen oxide-acetylene flame may be used for the determination, in which case the sensitivity is decreased by a factor of about 3. 4 Reagents During the analysis, use only reagents of recognized analytical gr
22、ade 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 Hydrochloric 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 ac
23、id, 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 magnesium content less than 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.
24、 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 iron 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.
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