BS 6049-5-1989 Methods of test for tea - Determination of water-soluble ash and water-insoluble ash《茶叶试验方法 第5部分 水可溶和不溶灰分含量测定》.pdf
《BS 6049-5-1989 Methods of test for tea - Determination of water-soluble ash and water-insoluble ash《茶叶试验方法 第5部分 水可溶和不溶灰分含量测定》.pdf》由会员分享,可在线阅读,更多相关《BS 6049-5-1989 Methods of test for tea - Determination of water-soluble ash and water-insoluble ash《茶叶试验方法 第5部分 水可溶和不溶灰分含量测定》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD CONFIRMED JUNE 1993 BS 6049-5: 1989 ISO 1576:1988 Methods of test for tea Part 5: Determination of water-soluble ash and water-insoluble ash ISO title: Tea Determination of water-soluble ash and water-insoluble ash UDC 663.95:543.822:543.831:001.4:620.1BS6049-5:1989 This British Sta
2、ndard, having been prepared by the Food andAgriculture Standards PolicyCommittee, was publishedunder the authorityofthe Board of BSI andcomes into effect on 28April1989 BSI 12-1999 First published December 1980 First revision April 1989 The following BSI references relate to the work on this standar
3、d: Committee reference FAC/8 Draft (ref. 88/52908) announced inBSI News July 1988 ISBN 0 580 17217 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Food and Agriculture Standards Policy Committee (FAC/-) to Technical Committee FAC/8, up
4、on which the following bodies were represented: Campden Food Preservation Research Association Department of Trade and Industry (Laboratory of the Government Chemist) Ministry of Agriculture, Fisheries and Food Overseas Development Natural Resources Institute Paper Sack Development Association Ltd.
5、Tea Producers Association United Kingdom Tea Association Amendments issued since publication Amd. No. Date of issue CommentsBS6049-5:1989 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Principle 1 5 Appa
6、ratus 1 6 Procedure 1 7 Expression of results 1 8 Test report 2 Publications referred to Inside back coverBS6049-5:1989 ii BSI 12-1999 National foreword This Part of BS 6049 has been prepared under the direction of the Food and Agriculture Standards Policy Committee. It supersedes the1981 edition of
7、 BS6049-5, which is withdrawn, and implements an agreement, to which the UKwas a party, reached in Subcommittee8, Tea, of Technical Committee TC34, Agricultural food products, of the International Organization for Standardization (ISO). The UK also provides the Secretariat for the Subcommittee. This
8、 Part of BS6049 is identical with ISO1576:1988 “Tea Determination of water-soluble ash and water-insoluble ash”. The principal difference between this Part of BS6049 and the 1981 edition is that it is now considered that silica dishes are unsuitable for use with the test. Terminology and conventions
9、. The text of the International Standard has 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 drawn especially to the following. The comma has been used as
10、a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. The symbol “l” has been used to denote litre (and in its submultiples.). In British Standards it is current practice to use the symbol “L”. Wherever the words “International Stand
11、ard” appear, referring to this standard, they should be read as “Part of BS6049”. Additional information. With reference to6.2.1, water complying with grade3 of BS3978 “Specification for water for laboratory use” is suitable. This standard describes a method of test only and should not be referred t
12、o as a specification defining limits of purity. Reference to the standard should indicate that the method of test used is in accordance with BS6049-5. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corre
13、ct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard BS 6049 Methods of test for tea ISO 1572:1980 Part 1:1981 Preparation of ground sample of known dry matter content (Ide
14、ntical) ISO 1575:1987 Part 4:1988 Determination of total ash (Identical) ISO 1577:1987 Part 6:1988 Determination of acid-insoluble ash (Identical) ISO 1578:1975 Part 7:1981 Determination of alkalinity of water-soluble ash (Identical) Summary of pages This document comprises a front cover, an inside
15、front cover, pages i and ii, pages 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.BS6049-5:1989 BSI 12-1999 1 1 Scope This Internatio
16、nal Standard specifies a method for the determination of the water-soluble ash and the water-insoluble ash of tea. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication
17、, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of cu
18、rrently valid International Standards. ISO 1572:1980, Tea Preparation of ground sample of known dry matter content. ISO 1575:1987, Tea Determination of total ash. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 water-soluble ash the part of the tot
19、al ash dissolved by water under the conditions specified in this International Standard 3.2 water-insoluble ash the part of the total ash remaining after treatment with water under the conditions specified in this International Standard 4 Principle Extraction of the total ash with hot water, filtrat
20、ion through ashless filter paper, ignition and weighing of the residue to determine the insoluble ash; calculation of the soluble ash by difference. 5 Apparatus Usual laboratory apparatus and, in particular, the following. 5.1 Dish, of 50ml to 100ml capacity, used for the determination of total ash.
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- BS604951989METHODSOFTESTFORTEADETERMINATIONOFWATERSOLUBLEASHANDWATERINSOLUBLEASH 茶叶 试验 方法 部分 可溶 灰分 含量
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