1、STD-BSI BS EN 12147-ENGL 1777 1b24bb7 Ob217LL 122 BRITISH STANDARD Method for Determination of titratable acidity of fruit and vegetable juices BS EN 12147 : 1997 The European Stanhd EN 12147 : 1996 has the status of a British Standard ICs 67.160.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMIT
2、TED BY COPYRIGHT LAW STD-BSI BS EN LZLLi7-ENGL 1777 = LbZLIbb7 Ob21712 Ob7 Amd. No. Date BS EN 12147 : 1997 Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technid Committee AW/21, Fi-uit and vegetable juices, upon which the fo
3、llowing bodies were represented: British Fniit Juice Irnportrs Association British Retail Consortium British Soft Drinks Association Limited Campden and Chorleywood Food Research Association Department of ?iade and Industry (Laboratory of the Government Chemist) Leatherhead Food Research Associalion
4、 Minishy of Agnculture, Fisheries and Food Royal Society of Chemistry This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1997 BSI 1997 Amendments
5、 issued since publication The following BI references relate to the work on this standard Committee reference Awl21 Draft for comment 91157094 DC ISBN O 580 27424 1 STDSBSI BS EN 12Lq7-ENGL 1777 M Lb2Libb7 Ob217L3 TT5 BS EN 12147 : 1997 Contents page committees responsible Inside front cover Nationa
6、l foreword ii Foreword 2 Text of EN 12147 3 O BSI 1997 i BS EN 12147 : 1997 National foreword This British Standard has been prepared by Technid Committee AW/21, and is the English language version of EN 12147 : 1996 hit and wgetablejukes - Determ,imt.ion of titratubk acidity, published by the Europ
7、ean Committee for standardization (CEN). EN 12147 was produced as a result of ink VI is the volume, in milliiitres, of the sodium hydroxide solution (see 7.3) used for the determination; is the exact concentsaton, in moles per litre, of the sodium hydroxide solution (6.1). G If Vo is 25 ml and c is
8、0,25 moM, as specified in this European Standard, the titraable acidity CH+, expressed in millimoles of H+ per litre of product, is given by the formuh Report the result without a decimal place. 8.2 Calculation as acid content It is also possible to calculate the titratable acidity conventionally as
9、 acid content expressed in grams per litre of product, by multiplying the formula (8.1) by a factor corresponding to the acid given in table 1. cH+ = v1 x 10 (2) Tgble 1. Factors corresponding to different acids I I Acid I Factor I 10,075 0,067 9 Precision Details of the inter-laboratory test on the
10、 precision of the method are given in annex B. The dues derived from the inter-laboiatory test may not be applicable to dyte concentmiion ranges and matrices other thCui those given in annex B. 9.1 Repeatability The absolute difference between two single test results found on identicai test material
11、 by one operator using the same apparatus within the shortest feasible time interval will exceed the repeaability limit r in not more than 5 % of the cases. The due is: = 1,03 mm01 H+A 9.2 Reproducibility The absolute difference between two single test results on identicai test material reported by
12、two laboratories will exceed the reproducibility limit R in not more than5%ofthecases. The value is: R = 2,28 mm01 H+A 10 lkst report The test report shall contain the following dah - ali information necessary for the identification of the sample (kind of sample, origin of sample, designation); - a
13、reference to this European Standard -the date and type of sampling procedure (if -the date of receipt; -the date of test; - the test resuits and units in which they have been expressed; -whether the repeatability of the method has been verified; - any particular points observed in the course of the
14、test; - any operation not specified in the method or regarded as optional, which might have affected the results. Iniown); O BSI 1997 * * vi A 13 - STD-BSI BS EN 12147-ENGL 1797 W Lb24bb7 Ob21717 433 B C D E 12 13 14 13 Page 5 EN 12147 : 1996 39 72 Annex A (informative) Bibliography Determimtion of
15、titmtabie acidity : No. 3,1991. In: The CouaCted Analyses of the Intenzat- Federation of hit Juice Producers. Loose-leaf edition, as of 1991. Zug: Swiss Fniit Union. 35 39 41 51 82 118 153 222 Annex B (informative) Stalistid results of the inter-laboratory test in accordance with IS0 5725 : 1986, th
16、e foliowing parameters have been defined in an inter-laboratory test (for iiterature pertaining to the method see annex A). The test was conduced by the Max von Pettenkofer Institute of the Federal Health Office, Food Chemistry Department, Berlin, BRD. Year of interlaboratory test: 1993; Number of l
17、aboratories: 14; Number of samples: 5. I Sample Number of laboratories retained after elhmamg outliers Number of outliers (laboratories) Number of accepted results Mean value (mmol H+A) Repeatability standard deviation (sr) (mm01 H+/l) Repeatabiiity relative standard deviation (RSD,) (%) I Repeatabi
18、lity limit (r) (mol H+A) Reproducibility standad deviation (SR) (mol H+A) Reproducibility relative standard deviation (RSDR) (%) Reyroducibility limit (R) (mmol H+A) lI2l1 I- Il I Sample types: A: apple juice; B apricotnectar; C grapejuice; D: orangejuice; E grapefruitjuice. O BSI 1997 STD-BSI BS EN
19、 12147-ENGL 1777 m Lb24bb7 Ob21720 135 m BS EN 12147 : 1997 List of references see national foreword. O BSI 1997 STD-BSI BS EN 12147-ENGL 1777 Lb2Libb7 Ob21721 O71 BS EN 12147 : 1997 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body res
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