EN 1131-1994 en Fruit and Vegetable Juices - Determination of the Relative Density《水果和蔬菜汁 相对浓度的测定》.pdf

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1、BRITISH STANDARD Method for Determination of the relative density of fruit and vegetable juices The European Standard EN 1131 : 1994 has the status of a British Standard UDC 663.8U.82 : 620.1 : 531.756 BS EN 1131 : 1995 - CEN EN*L131 94 m 3404589 0083283 98T m Board (iV/-), was published under the a

2、uthority of the Standards Board and comes into effect on 15 January 1995 Amd. No. BS EN 1131 : 1995 Date Text affected Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizatio

3、ns of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands . Norway Portugal Spain Sweden Switzerland United Kingdom Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standard Suomen Standardisoimisliito, r

4、.y. Association francaise de normalisation Deutsches Institut fr Normung C.V. Hellenic Organization for Standardization %chnological Institute of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederlands Normalisatie-institu

5、ut Norges Standardiseringsforbund Instituto Portugus da Qualidade Asociacin Espaola de Normalizacin y Certificacin Standardiseringskodssionen i Sverige Association suisse de normalisation British Standards Institution O BSI 1995 The following BSI references relate to the work on this standard: Commi

6、ttee reference AW/Zi Draft for comment 89/54816 DC ISBN O 680 23150 X _I_ -_. CEN EN*113L 94 3404589 0083284 816 M BS EN 1131 : 1995 Contents Cooperating organizations National foreword Page Inside front cover i Foreword 2 Text of EN 1131 3 National annex NA (informative) Committees responsible Insi

7、de back cover National annex NB (informative) Cross-references Inside back cover National foreword This British Standard has been prepared by Technical Committee AW/21, Fruit and vegetable juices, and is the English language version of EN 1131 : 1994 Fwit und vegetubie juices - Deti?rtnimtion of rel

8、utive clensitg, published by the European Committee for Standardization (CEK). EN 1131 was produced as a result of international discussions in which the United Kingdom took an active part. Compliance with a British Standard does not of itself confer immunity from legal obligations. i CEN EN*ll3l 94

9、 3404589 0083285 752 EUROPEAN STANDARD EN 1131 NORME EUROPENNE EUROPISCHE NORM October 1994 UDC 663.81;.82:620.1:.531.756 Descriptors: food products, beverages, fruit and vegetable juices, chemical analysis, measurements, density (mass volume) English v,ersion Fruit and vegetable juices - Determinat

10、ion of the relative density Jus de fruits et de lgumes - Dtermination de la densit relative Frucht- und Gemsesfte - Bestimmung der relativen Dichte This European Standard was approved by CEN on 1994-09-29. CEN members are bound to comply with the CEN/CE:NELEC Internal Regulations which stipulate the

11、 conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in

12、three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into it.$ own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies o

13、f Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretari

14、at: rue de Stassart 36, B-1050 Brussels O 1994 Copyright reserved to CEN members Ref No. EN 1131 : 1994 E CEN ENxLL3L 94 = 3404589 0083286 b Page 2 EN 1131 : 1994 Foreword This European Standard has been prepared by the Technical Committee CEN/TC 174, Fruit and vegetable juices - Methods of analysis

15、, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a National Standard, either by publication of an identical text or by endorsement, at the latest by April 1995, and conflicting national standards shall be withdrawn at the latest by April 1995. Annexes

16、designated ?informative? are given only for information. In this standard annexes A and B are informative. In accordance with the CENKENELEC Internal Regulations, the foilowing countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Icela

17、nd, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. -I_ - - _- - - - . - - CEN EN*lL3L 94 3404589 0083287 525 m 1 Scope This European Standard specifies a method for the determination of the relative density d2ci SC 20 oc of fruit and vegetab

18、le juices and related products. 2 Normative references This European Standard incorporates by dated or unclatecl reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references,

19、subsequent aineiidineiits to or revisions of any of these publications apply to this European Standard only when incoi?,oratecl in it by aitiendinent or revision. For undated references the latest edition of the publication referred to applies. IS0 5725 : 1986 Precision of test methocls - Dett. wi r

20、zu ton of epeei tu b lity ancl meth oc1 bg in ter-lec boratory tests Wetter fo- cmalgtical laborutory use re,roeluciblity for e1 StcIrzclUrcl test - sJ3ecificeltioz ctrzcl test methocls IS0 3696 : 1987 3 Definition For the purposes of this stanclarcl, the following definition applies: 3.1 relative d

21、ensity, elzo The mass of a known volume of the test sample at 20 OC divided by the mass of an equal volume of air-free water at 20 OC (pure number without units). 2lj oc 4 Principle The relative density is determined using a pyknometer. 5 Reagents 5.1 General Use only degassed water in accordance wi

22、th at least gracie 3 of IS0 3696 : 1987. to clean the pyknometer (6.4) SAFETY WARNfiTG. Extreme care should be exercised when using and transporting potassium dicu.oiiiate-sulfLric acid solution, which is a strong acid and oxidant. Zike appropriate measures to protect skin, eyes ancl clothing. Zleve

23、r add water to this solution, since a large amount of heat will be generated locally, resulting in danger of sputtering. Zike appropriate measures when disposing of used solutions. 5.2 POtUSSl?il clicTcIrizcct-szlc ucid solzltoz, Page 3 EN 1131 : 1994 5.3 Appoprate yluss clmning cegent, with cleansi

24、ng effect comparable to (5.2) (alternative to (5.2). 6 Apparatus Csual laboratoiy apparatus and, in particular! the follotving : 6.1 Desiccator with diying agent. 6.2 We nominal capacity 50 ml, with ground glass stopper: with a neck 6 cm long and not more than 3,s inm internal diameter, provided in

25、the middle third with a mark or scale. 6.5 FVick-mouthed pylmmete if the relative density of a concentrated product ancl fruit pulp is to be determined (alternative to 6.4). 6.6 Fumel, diameter 10 cin. 6.7 Fluted filter pape 6.8 W with water at 20 OC, in grams; with test sample at 20 OC, in grams. E

26、xpress the relative density a reference to this European Standard; the date and type of sampling procedure (if possible) ; the date of receipt; the date of test; the test results and units in which they have been expressed; whether the repeatability of the method has been verified; any particular po

27、ints observed in the couise of the test; any operations not specified in the method or regarded as optional, which might have affected the results. Page 5 EN 1131 : 1994 Annex A (informative) Bibliography i Determination of the relative density Fax: 0181 996 7001. in response to orders for internati

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