3European Commission.Concerning a coordinated community monitoring programme for 1999 to ensure compliance with maximum levels of pesticide residues in and on cereals and certain products of plant origin,including fruit and vegetables[J].Official Journal of the European Communities,1999,L128:25-55.
4SLR Ellison,B King,M Rosslein,et al.Eurachem/CITAC guide,traceability in chemical measurement-A guide to achieving comparable results in chemical measurements.2003,http://www.eurachem.ul.pt/guides/Traceab.htm.