1、BRITISH STANDARD BS 5072-4: 1980 ISO 3428:1976 Methods of Test for sodium fluoride for industrial use Part 4: Preparation and storage of test samples ISO title: Sodium fluoride for industrial use Preparation and storage of test samples UDC 661.833.361:546.33161:543.05BS5072-4:1980 This British Stand
2、ard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority of the Executive Board and comes into effect on 30April1980 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment
3、74/54500 DC ISBN 0 580 11214 4 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 Distiller
4、s British Tar Industry Association Chemical Industries Association* Chemical Society, Analytical Division* Consumer Standards Advisory Committee of BSI Department of Health and Social Security Department of Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Hyd
5、rocarbon Solvents Association Ministry of Agriculture, 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 C
6、ommittee The 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 iss
7、ued since publication Amd. No. Date of issue CommentsBS5072-4:1980 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope and field of application 1 2 Preparation of test samples 1 3 Marking 1 Annex ISO publications relating to sodium fluoride for indus
8、trialuseandsodiumfluoride primarily used for the production of aluminium 2 Publications referred to Inside back coverBS5072-4:1980 ii BSI 12-1999 National foreword WARNING NOTE. Sodium fluoride is toxic and is irritant, particularly in the form of dust. Carry out operations involving its use in a fu
9、me cupboard and wear suitable protective clothing to prevent inhalation of the dust and contact with the eyes, skin and clothing. This British Standard has been prepared under the direction of the Chemicals Standards Committee in order to provide methods for the analysis of sodium fluoride for indus
10、trial use. For some years the UnitedKingdom has participated in the work of preparing methods of test applicable to this material, organized by Subcommittee7 (formerly WG8), Aluminium oxide and related compounds, of Technical Committee47, Chemistry, of the International Organization for Standardizat
11、ion (ISO). As international agreement is reached on the methods, it is proposed to publish them as Parts of this British Standard. This Part is identical with ISO3428 “Sodium fluoride for industrial use Preparation and storage of test samples”. Terminology and conventions. The text of the Internatio
12、nal Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used as a decimal marker. In Briti
13、sh Standards, it is 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”. Related British Standards for ISO2831 1) , ISO2832 1)and ISO2833 1)are BS410 and BS5
14、072-1, BS5072-2 and BS5072-3 respectively, and for ISO565 the related British Standard is BS410. At present there is no British Standard corresponding to ISO . . . . (clause2.1). Reference should be made to BS5309 “Methods for sampling chemical products” Part 4 “Sampling of solids”. NOTEThe title an
15、d clause1 of ISO3429, ISO3430, ISO3431, ISO3566 and ISO4278 (see the Annex ) state that the sodium fluoride is “primarily used for the production of aluminium”. This is incorrect, at least for the UnitedKingdom. This has been brought to the attention of ISO Technical Committee47, in a proposal to am
16、end the International Standards concerned. Additional information. This standard prescribes methods of test only, and should not be used or quoted as a specification defining limits of purity. Reference to the standard should indicate that the methods of test comply with the requirements of BS5072-4
17、. Cross-references International Standard Corresponding British Standard BS 5072 Methods of test for sodium fluoride for industrial use ISO 3429:1976 1) Part 5:1980 Determination of iron content (Identical) ISO 3430:1976 1) Part 6:1980 Determination of silica content (Identical) ISO 3431:1976 1) Par
18、t 7:1980 Determination of soluble sulphates content (Identical) ISO 3566:1976 1) Part 8:1980 Determination of chlorides content (Identical) ISO 4278:1977 1) Part 9:1980 Determination of carbonate content (Identical) 1) Referred to in the Annex , for information only.BS5072-4:1980 BSI 12-1999 iii A B
19、ritish Standard does not purport 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. Summary of pages This document comprises a f
20、ront cover, an inside front cover, pages i to iv, pages1and 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 indicated in the amendment table on the inside front cover.iv blankBS5072-4:1980 BSI 12-199
21、9 1 1 Scope and field of application This International Standard specifies methods for preparation and storage of test samples in the natural state (crude) and dried samples, of sodium fluoride for industrial use. 2 Preparation of test samples 2.1 Laboratory sample For the preparation of the laborat
22、ory sample, use the method specified in ISO . . . 2) . 2.2 Crude sample, intended for the determination of moisture content Take about300g of the laboratory sample and place in a tightly closed container of capacity such that it is almost filled by the sample. 2.3 Dried sample, intended for chemical
23、 tests 2.3.1 Principle Grinding and sieving of the sample until it passes completely through a sieve of mesh aperture0,125mm (see ISO565). Mixing and drying. 2.3.2 Apparatus Ordinary laboratory apparatus and 2.3.2.1 Sieve, of mesh aperture0,125mm, constructed of a material which will not introduce t
24、he impurity to be determined. NOTEThe sieve material should be chosen in relation to the impurity to be determined. 2.3.2.2 Mortar, of corundum or agate. 2.3.2.3 Electric oven, capable of being controlled at110 2 C. 2.3.3 Procedure Sieve about100g of the laboratory sample through the sieve (2.3.2.1)
25、. Grind the residue in the mortar(2.3.2.2) and sieve again. Add to the previously sieved portion and thoroughly mix. Repeat the operations of grinding, sieving and mixing until there is no residue left on the sieve. Place the sample thus prepared in a platinum dish and dry in the oven (2.3.2.3), con
26、trolled at110 2 C, for at least2h. Withdraw the dish from the oven and allow to cool in a desiccator. Store the dried sample in a tightly closed container of such capacity that it is almost filled by the sample. 3 Marking The containers shall carry a label showing: a) the name of the product; b) the
27、 origin of the product; c) the type of sample (crude or dried); d) the material of the sieve used; e) the date of preparation. 2) In preparation.BS5072-4:1980 2 BSI 12-1999 Annex ISO publications relating to sodium fluoride for industrial use and sodium fluoride primarily used for the production of
28、aluminium Sodium fluoride for industrial use ISO 2831, Determination of water-insoluble matter. ISO 2832, Determination of moisture content. ISO 2833, Determination of fluorine content Modified Willard-Winter method. ISO 3428, Preparation and storage of test samples. Sodium fluoride primarily used f
29、or the production of aluminium ISO 3429, Determination of iron content 1,10-Phenanthroline photometric method. ISO 3430, Determination of silica content Reduced molybdosilicate spectrophotometric method. ISO 3431, Determination of soluble sulphates content Turbidimetric method. ISO 3566, Determinati
30、on of chlorides content Turbidimetric method. ISO 4278, Determination of carbonates content Gravimetric method.BS5072-4:1980 BSI 12-1999 Publications referred to See national foreword.BS 5072-4: 1980 ISO3428:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the inde
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