BS-7709-6-1993 ISO-10136-6-1993.pdf
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1、BRITISH STANDARD BS 7709-6: 1993 ISO 10136-6: 1993 Analysis of extract solutions of glass Part 6: Method for determination of boron(III) oxide by molecular absorption spectrometry UDC 666.11/.18.01.2:543.422:546.273-31 Licensed Copy: London South Bank University, London South Bank University, Fri De
2、c 08 13:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7709-6:1993 This British Standard, having been prepared under the direction of the Laboratory Apparatus Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 September 1993 BSI 10-1
3、999 The following BSI references relate to the work on this standard: Committee reference LBC/36 Draft for comment 90/56739 DC ISBN 0 580 22289 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Laboratory Apparatus Standards Policy Commi
4、ttee (LBC/-) to Technical Committee LBC/36, upon which the following bodies were represented: Association for Science Education BLWA Ltd. (The Association of the Laboratory Supply Industry) British Glass Manufacturers Confederation CLEAPSS School Science Service Department of Trade and Industry (Lab
5、oratory of the Government Chemist) Institute of Medical Laboratory Sciences The following body was also represented in the drafting of the standard, through a subcommittee: Society of Glass Technology Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank Universit
6、y, London South Bank University, Fri Dec 08 13:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7709-6:1993 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Introduction1 1Scope1 2Normative references1 3Definitions2 4Principle2 5Reagents2 6Apparatus3 7Sampli
7、ng and samples3 8Procedure3 9Expression of results4 10Test report4 Annex A (informative) Bibliography5 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7709-6:1993 ii BSI 1
8、0-1999 National foreword This Part of BS 7709 has been prepared under the direction of the Laboratory Apparatus Standards Policy Committee and is identical with ISO 10136-6:1993 Glass and glassware Analysis of extract solutions Part 6: Determination of boron(III) oxide by molecular absorption spectr
9、ometry, published by the International Organization for Standardization (ISO). ISO 10136-6 has been prepared by Subcommittee 5 of Technical Committee ISO/TC 48, with the active participation and approval of the UK. BS 7709 is published in six Parts as follows: Part 1: Method for determination of sil
10、icon dioxide by molecular absorption spectrometry; Part 2: Method for determination of sodium oxide and potassium oxide by flame spectrometric methods; Part 3: Method for determination of calcium oxide and magnesium oxide by flame atomic absorption spectrometry; Part 4: Method for determination of a
11、luminium oxide by molecular absorption spectrometry; Part 5: Method for determination of iron(III) oxide by molecular absorption spectrometry and flame atomic absorption spectrometry; Part 6: Method for determination of boron(III) oxide by molecular absorption spectrometry. BS 2649 Methods for analy
12、sis of glass Part 1:1988 Glasses of the soda-lime-magnesia-silica type and Part 3:1988 Glasses of the potassium oxide-lead oxide-silica type describe methods of determination primarily of the gravimetric type. The methods given in BS 7709 should be considered complementary to those of BS 2649. The T
13、echnical Committee has reviewed the provisions of ISO 385-2, ISO 648, ISO 835-3 and ISO 6955, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. Cross-references International StandardCorresponding British Standard IS
14、O 835-1:1981BS 700 Graduated pipettes Part 1:1982 Specification for general requirements (Identical) ISO 835-2:1981Part 2:1982 Specification for pipettes for which no waiting time is specified (Identical) ISO 1042:1983BS 1792:1982 Specification for one-mark volumetric flasks (Identical) ISO 3585:199
15、1BS 2598 Glass plant, pipeline and fittings Part 1:1991 Specification for properties of borosilicate glass 3.3 (Identical) ISO 3696:1987BS 3978:1987 Specification for water for laboratory use (Identical) ISO 3819:1985BS 6523:1984 Specification for glass beakers for laboratory use (Technically equiva
16、lent) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7709-6:1993 BSI 10-1999iii This British Standard describes a method of test only and should not be used or quoted as a specification defining limits of p
17、erformance. Reference to this British Standard should indicate that the method of test used is in accordance with BS 7709-6:1993. 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. Compl
18、iance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have
19、 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 13:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, Londo
20、n South Bank University, Fri Dec 08 13:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7709-6:1993 BSI 10-19991 Introduction The amounts of boron(III) oxide (B2O3) extracted from glass and glassware during hydrolytic resistance tests are normally very small, even from heat-resisting borosilicate
21、 glass 3.3 used for making laboratory ware. Therefore, neither macro-titration methods nor flame atomic absorption spectrometry are suitable for its determination, so recourse shall be made to colorimetric techniques using measurement by molecular absorption spectrometry. Boron(III) oxide forms colo
22、ured complexes with a number of organic reagents, but those most commonly used are curcumin, 1,1-dianthrimide, carminic acid, quinalizarin, and for some years azomethine H. Technical Committee 2, Chemical Durability and Analysis, of the International Commission on Glass (ICG), examined the determina
23、tion of boron(III) oxide using all of these reagents (see 7 in Annex A) and recommended the procedure using azomethine H, after consideration of all of the results and comments received. In a round-robin examination involving eleven laboratories, the participants were provided with a homogeneous ext
24、ract solution obtained from ordinary borosilicate glass containers using an autoclave process according to ISO 4802. The results obtained were considered to be very satisfactory. The results of investigations on turbidities, especially in grain test solutions, showed that acidification to dissolve p
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