BS-EN-12497-2005.pdf
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1、BRITISH STANDARD BS EN 12497:2005 Paper and board Paper and board intended to come into contact with foodstuffs Determination of mercury in an aqueous extract The European Standard EN 12497:2005 has the status of a British Standard ICS 67.250; 85.060 ? BS EN 12497:2005 This British Standard was publ
2、ished under the authority of the Standards Policy and Strategy Committee on 12 December 2005 BSI 12 December 2005 ISBN 0 580 46956 5 National foreword This British Standard is the official English language version of EN 12497:2005. It supersedes DD ENV 12497:1998 which is withdrawn. The UK participa
3、tion in its preparation was entrusted by Technical Committee CW/47, Materials and articles in contact with foodstuffs, to Subcommittee CW/47/3, Paper and board in contact with foodstuffs, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/
4、European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary
5、. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue
6、or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document com
7、prises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EURO
8、PENNE EUROPISCHE NORM EN 12497 August 2005 ICS 67.250; 85.060Supersedes ENV 12497:1998 English Version Paper and board - Paper and board intended to come into contact with foodstuffs - Determination of mercury in an aqueous extract Papier et carton - Papiers et cartons destins entrer en contact avec
9、 les denres alimentaires - Dtermination du mercure dans un extrait aqueux Papier und Pappe - Papier und Pappe fr den Kontakt mit Lebensmitteln - Bestimmung von Quecksilber in einem wssrigen Extrakt This European Standard was approved by CEN on 27 June 2005. CEN members are bound to comply with the C
10、EN/CENELEC Internal Regulations which stipulate the 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 t
11、o any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official version
12、s. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerl
13、and and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN
14、 12497:2005: E EN 12497:2005 (E) 2 Contents page Foreword 3 1 Scope.4 2 Normative references .4 3 Principle.4 4 Reagents4 4.1 General 4 4.2 Nitric acid (HNO3), 65 % (d = 1,42).4 4.2.1 Nitric acid (4.2), diluted 1 : 1 (V/V) with water.4 4.2.2 Nitric acid (4.2), diluted to 1,5 % (V/V) with water.4 4.3
15、 Potassium permanganate (KMnO4), 5 % aqueous solution (m/V).4 4.4 Mercury, stock solution, 1000 mg/l4 Sulphuric acid (H2SO4), (d = 1,84).5 4.6 Potassium dichromate (K2Cr2O7), 50 g/l in sulphuric acid solution5 4.7 Hydroxylammonium chloride (HONH3Cl), 20 g/l aqueous solution.5 4.8 Reducing solutions.
16、5 4.8.1 Tin (II) chloride (SnCl2 2H2O), 50 g/l in 10 % hydroxhloric acid (4.9.1)5 4.8.2 Sodium tetrahydroborate (NaBH4), 0,2 g/l in 0,05 % sodium hydroxide solution (4.10) 5 4.9 Hydrochloric acid (HCl), 36 % (d = 1,19)5 4.9.1 Hydrochloric acid (4.9) (HCl), diluted 10 % (V/V) 5 4.10 Sodium hydroxide
17、(NaOH), 0,05 % aqueous solution (m/V) 5 5 Apparatus5 5.1 General 5 5.2 General laboratory equipment .5 5.3 Volumetric flasks, 100 ml .5 5.4 Analytical balance, accuracy 0,1 mg.5 5.5 Pipettes from 100 l to 10 ml, glass or plastics, (high density polyethylene/polypropylene).5 5.6 Atomic absorption spe
18、ctrometer with an appropriate detection system and sensitivity6 6 Preparation of sample 6 7 Procedure6 7.1 General 6 7.2 Preparation of reference solution6 7.3 Determination of mercury.6 7.3.1 General 6 7.3.2 Standard additions7 7.4 Determination of blank value.7 8 Expression of results7 9 Precision
19、8 10 Test report.8 EN 12497:2005 (E) 3 Foreword This European Standard (EN 12497:2005) has been prepared by Technical Committee CEN/TC 172 “Pulp, paper and board”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication
20、of an identical text or by endorsement, at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006. This European Standard supersedes ENV 12497:1998. With regard to ENV 12497:1998 the following changes have been made: a) implementation in a E
21、uropean Standard; b) addition of the clause “Precision“; c) editorial updating. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia
22、, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12497:2005 (E) 4 1 Scope This European Standard is one in a series of standards for
23、 the determination of heavy metals in an aqueous extract of paper and paperboard intended for contact with food. This European Standard specifies the test method for the determination of mercury in an aqueous extract. It is applicable to paper and board with extractable mercury content exceeding 0,0
24、6 mg per kg. NOTE 1 The above limit of determination is 5 times below the actual limit existing today or proposed in Europe. NOTE 2 Mercury content levels below 0,06 mg per kg can be measured by this European Standard, if very sensitive equipment is available and if all other laboratory conditions f
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