BS 5050-8-1980 Methods of test for cryolite - Determination of calcium content《冰晶石试验方法 第8部分 钙含量测定》.pdf
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1、BRITISH STANDARD BS 5050-8: 1980 ISO 3391:1976 Methods of Test for cryolite Part 8: Determination of calcium content ISO title: Cryolite, natural and artificial Determination of calcium content Flame atomic absorption method UDC 661.862.369:546.41:543.422BS5050-8:1980 This British Standard, having b
2、een prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Executive Board and comesinto effect on 31 December 1980 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment 74/54499 D
3、C ISBN 0 580 11449 X Cooperating organizations The Chemicals Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Fatty Acid Distillers British
4、Tar Industry Association Chemical Industries Association* Consumer Standards Advisory Committee of BSI Department of Health and Social Security Department of Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Hydrocarbon Solvents Association Ministry of Agricul
5、ture, Fisheries and Food Ministry of Defence National Sulphuric Acid Association Paintmakers Association of Great Britain Ltd. Royal Institute of Public Health and Hygiene Soap and Detergent Industry Association Standardization of Tar Products Tests Committee Chemical Society, Analytical Division* T
6、he organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Aluminium Federation British Ceramic Research Association Royal Institute of Chemistry Amendments issued since
7、publication Amd. No. Date of issue CommentsBS5050-8:1980 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope and field of application 1 2 Reference 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 3 8 Test report 3 Pub
8、lications referred to Inside back coverBS5050-8:1980 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Chemicals Standards Committee in order to provide methods for the analysis of cryolite for industrial use. For some years the UnitedKingdom has par
9、ticipated in the work of preparing methods of test applicable to this material, organized by Sub-committee7 (formerly WG8), Alumina and related compounds, of Technical Committee47, Chemistry, of the International Organization for Standardization (ISO). As international agreement is reached on the me
10、thods, it is proposed to publish them as Parts of this BritishStandard. This Part of BS5050 is identical with ISO3391 “Cryolite, natural and artificial Determination of calcium content Flame atomic absorption method”. Terminology and conventions. The text of the International Standard has been appro
11、ved as suitable for publication, without deviation, as a BritishStandard. Some terminology and certain conventions are not identical with those used in BritishStandards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards, it i
12、s current practice to use a full point on the baseline as the decimal marker. Where the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross-references There is at present no British Standard identical with ISO1619:1976, but clause2.3 of
13、 BS5050:1974 “Methods of test for cryolite”, covers the same ground as clause3.3 of ISO1619 (referred to in clause6.1 of this standard). The other International Standards listed in the annex are for information only. Corresponding British Standards are listed below. International Standard Correspond
14、ing British Standard BS 5050:1974 Methods of test for cryolite Title ISO 1620:1976 Clause 3 Determination of silica content (Related) ISO 1693:1976 Clause 4 Determination of fluorine content (Related) ISO 1694:1976 Clause 5 Determination of iron content (Related) ISO 2366:1974 Clause 6 Determination
15、 of sodium content (Related) ISO 2367:1972 Clause 7 Determination of aluminium content (gravimetric method) (Related) ISO 2830:1973 Clause 8 Determination of aluminium content (atomic absorption method) (Related) BS 5050 Methods of tests forcryolite ISO 3392:1976 Part 9:1980 Determination of water c
16、ontent (Karl Fischer method) (Identical) ISO 3393:1976 Part 10:1980 Gravimetric determination of moisture content (Identical)BS5050-8:1980 BSI 12-1999 iii The first seven international test methods in the cryolite series were published in combined form as BS5050:1974 and were modified both to take i
17、nto account UnitedKingdom comments made during their development and to conform with BSI layout. In accordance with current policy the remaining standards are to be published, without alteration, as separate dual numbered (BSI/ISO) Parts of this British Standard. In order to establish a uniform and
18、acceptable overall layout, it is intended, in conjunction, to revise the1974 edition, progressively replacing it by the corresponding International Standards which will also be published, without alteration, as separate Parts of this British Standard. The change will be made, for each Part, immediat
19、ely following the routine five-yearly review of the International Standard concerned. This will ensure that the revised standard satisfies current requirements and will allow the UnitedKingdom to propose changes if the International Standards are not completely acceptable as they stand. It is expect
20、ed, however, that such changes will be minimal. When the process of revision has been completed, the1974 edition will be withdrawn. Additional information Water. Water complying with the requirements of clause4 is specified inBS3978:1966 “Water for laboratory use”. Hydrochloric acid, approximately1.
21、18g/ml, about36% (m/m) solution, which is the corresponding reagent normally obtainable in the UnitedKingdom, is suitable for use in place of the approximately1.19g/ml solution specified in4.2. Clause 4.5. The identity of the hydrochloric acid specified in line3 has been omitted. Line3 should read “
22、50,0ml of the hydrochloric acid solution (4.2), diluted (1+1)”. Clause 6.3.1, 6.4.1. The evaporations described in6.3.1, paragraph2 and6.4.1, paragraph1, should be carried out in an efficient fume cupboard. WARNING. Perchloric acid, specified as an alternative reagent in the note to6.3.1, is toxic,
23、severely corrosive and may cause fire in contact with combustible materials. Prevent contact with eyes, skin, clothing and other combustible material. Carry out all operations involving its use in an efficient fume cupboard. Users of perchloric acid are advised to consult appropriate literature for
24、more detailed recommendations. This standard prescribes methods of test only, and should not be used or quoted as a specification defining limits of purity. References to the standard should state that the methods of test used comply with the requirements of BS5050. A British Standard does not purpo
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