BS 6070-4-1981 Methods of sampling and test for sodium carbonate for industrial use - Determination of matter insoluble in water《工业用碳酸钠取样及试验方法 第4部分 水溶物质测定》.pdf

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

24、rred to See national foreword.BS 6070-4: 1981 ISO 746:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is inc

25、orporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyo

26、ne finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS whic

27、h ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it i

28、s BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters

29、 Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts

30、 on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bo

31、dies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the fre

32、e use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.