18. 10. 90 Official Journal of the European Communities No L 286/33 COMMISSION DECISION' of 26 September 1990 laying down the reference methods for detecting residues of heavy metals and arsenic (90/515/EEC) THE COMMISSION OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Economic Community, Having regard to Council Directive 64/433/EEC of 26 June 1964 on health problems affecting intra-Community trade .in fresh meat (), as last amended by Directive 89/662/EEC (3, and in particular Article 4 (1) (b) thereof, Having regard to the opinion of the Scientific Veterinary Committee, Whereas, pursuant to Article 4 (1) (b) of Directive 64/433/EEC, reference methods should be laid down for assessing the results of the examination for residues; Whereas Article 1 of Commission Decision 89/610/EEC of 14 November 1989 laying down the reference methods and the list of national reference laboratories for detecting residues () excludes coverage of heavy metals and arsenic ; Whereas, pursuant to the second subparagraph of Article 8 (3) of Council Directive 86/469/EEC of 16 December 1986 concerning the examination of animals and fresh meat for the presence of residues (¥), all positive findings must, if challenged, be confirmed using the reference methods established pursuant to Article 4 (1) (b) of Direc- tive 64/433/EEC; Whereas the determination of reference methods includes the definition of the analytical reference procedures to be followed and the criteria to be applied when carrying out the analyses ; Whereas the measures provided for in this Decision are in accordance with the opinion of the Standing Veterinary Committee, HAS ADOPTED THIS DECISION : Article 1 The analytical reference procedures to be applied for confirmation of the presence of residues shall be the following : ' ' 1. for arsenic: — atomic absorption spectrometry (AAS) (graphite furnace or hydride generation technique), () OJ No 121, 29. 7. 1964, p. 2012/64. () OJ No L 395, 30. 12. 1989, p. 13. () O No L 351, 2. 12. 1989, p. 39. () OJ No L 275, 26. 9. 1986, p. 36. — colorimetry {(after complexation). 2. for cadmium and lead‘: — atomic absorption spectrometry (AAS) (graphite furnace or flame) — anodic stripping voltammetry by derivative pulse polarography (DPASV). 3. for mercury: cold vapour phase atomic absorption spectrometry (AAS). Article 2 The analytical reference procedure of choice must be based preferably on atomic absorption spectrometry (AAS) and must have a limit of detection which is equal to or lower than that of the procedure used for routine analyses. Article 3 The criteria applicable to the analytical reference proce- dure are set out in the Annex. Article 4 This Decision shall be reexamined before 1 January 1996 in order to take account of developments in scientific and technical knowledge. Article 5 This Decision is addressed to the Member States. Done at Brussels, 26 September 1990. For the Commission Ray MAC SHARRY Member of the Commission