1、BRITISH STANDARD BS 6070-4: 1981 ISO 746:1976 Methods of Sampling and test for sodium carbonate for industrial use Part 4: Determination of matter insoluble in water ISO title: Sodium carbonate for industrial use Determination of matter insoluble in water at 50 C NOTEIt is recommended that this Part
2、 be read in conjunction with the information in the “General introduction”, published separately as BS 6070-0. UDC 661.833.622:546.33264:543.721BS6070-4:1981 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe E
3、xecutive Board and comesinto effect on 27 February 1981 BSI 12-1999 The following BSI reference relates to the work on this standard: Committee reference CIC/22 ISBN 0 580 12003 1 Amendments issued since publication Amd. No. Date of issue CommentsBS6070-4:1981 BSI 12-1999 i Contents Page National fo
4、reword ii 1 Scope and field of application 1 2 References 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 1 8 Test report 1 Annex ISO Publications relating to sodium carbonate for industrial use 2 Publications referred to Inside back coverBS6070-4:1981 ii BSI 12-1999
5、 National foreword This Part of BS6070 is identical with ISO746 “Sodium carbonate for industrial use Determination of matter insoluble in water at50 C” published in1976by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has
6、 been approved as suitable for publication as a British Standard without deviation. 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 throughout as a decimal marker. In British Stan
7、dards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. There is no British Standard corresponding directly to ISO739 to which reference is made
8、in6.1. Technically equivalent information is given in BS6070-0. The standards listed in the Annex are intended for information only. Corresponding British Standards are listed in BS6070-0. Additional information Water. Water complying with the requirements of clause4 is specified in BS3978 “Water fo
9、r laboratory use”. A British 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. Cross-references Inter
10、national Standard Corresponding British Standard ISO 745:1976 BS 6070 Methods of sampling and test for sodium carbonate for industrial use Part 3:1981 Determination of non-volatile matter (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages
11、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 indicated in the amendment table on the inside front cover.BS6070-4:1981 BSI 12-1999 1 1 Scope and field of application This International Standa
12、rd specifies a method for the determination of the matter insoluble in water at50 C of sodium carbonate for industrial use. 2 References ISO 739, Sodium carbonate for industrial use Preparation and storage of test samples. ISO 745, Sodium carbonate for industrial use Determination of loss of mass an
13、d of non-volatile matter at250 C. 3 Principle Dissolution of a test portion and filtration of the solution through a tared filter. Washing of the insoluble matter at approximately50 C until the washings are no longer alkaline. Drying of the residue and weighing. 4 Reagents During the analysis, use o
14、nly reagents of recognized analytical reagent grade and only distilled water or water of equivalent purity. 4.1 Phenolphthalein, 10g/l ethanolic solution. Dissolve1g of phenolphthalein in95% (V/V) ethanol and dilute to100ml with the same ethanol. 5 Apparatus Ordinary laboratory apparatus and 5.1 Gla
15、ss filter crucible, with sintered disk of porosity grade P16 (pore size between10and164m). 5.2 Electric oven, capable of being controlled at110 5 C. 6 Procedure 6.1 Test portion Weigh, to the nearest0,01g,50 0,1g of the test sample (see ISO739). 6.2 Determination Dissolve the test portion by adding
16、small quantities at a time, while stirring, to a beaker of suitable capacity (for example600ml) containing 200ml of water heated to approximately50 C. Place the crucible(5.1) in the oven(5.2) controlled at110 5 C. After drying for1h, remove it, allow to cool in a desiccator to ambient temperature an
17、d weigh to the nearest0,0001g. Filter the decanted sodium carbonate solution through the tared filter crucible maintaining a reduced pressure by means of a filter pump or a vacuum pump. Wash the insoluble matter onto the sintered disk with water at approximately50 C until20ml of the filtrate show no
18、 colour on addition of2drops of the phenolphthalein(4.1). Place the filter crucible containing the insoluble matter in the oven controlled at110 5 C and leave to dry for1h. After cooling, in a desiccator to ambient temperature, weigh to the nearest0,0001 g. 7 Expression of results The matter insolub
19、le in water at50 C, expressed as a percentage by mass, is given by the formula: where NOTEIf it is desired to express the result on the basis of non-volatile matter at250 C (see ISO745), multiply the result obtained on the product as received by the ratio 8 Test report The test report shall include
20、the following particulars: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) any operation not included in this International Standard or in the International Standards to which reference is made, or rega
21、rded as optional. m 0 is the mass, in grams, of the test portion(6.1); m 1 is the mass, in grams, of the filtered and dried insoluble matter. 100 100 loss of mass at 250 C in % (m/m) m 1 100 m 0 - BS6070-4:1981 2 BSI 12-1999 Annex ISO Publications relating to sodium carbonate for industrial use ISO
22、739, Preparation and storage of test samples. ISO 740, Determination of total soluble alkalinity Titrimetric method. ISO 741, Determination of sodium hydrogen carbonate content Titrimetric method. ISO 742, Determination of chloride content Mercurimetric method. ISO 743, Determination of sulphate con
23、tent Barium sulphate gravimetric method. ISO 744, Determination of iron content 1,10-Phenanthroline photometric method. ISO 745, Determination of loss of mass and of non-volatile matter at 250 C. ISO 746, Determination of matter insoluble in water at 50 C. BS6070-4:1981 BSI 12-1999 Publications refe
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