T. Rymen et al., REFERENCE MATERIALS FOR PCDD AND PCDF ANALYSIS - PRODUCTION AND VERIFICATION OF THE CONTENTS OF 12 CONGENERS IN ISOOCTANE REFERENCE SOLUTIONS, Fresenius' journal of analytical chemistry, 348(1-2), 1994, pp. 31-36
The Community Bureau of Reference (BCR) of the Commission of the Europ
ean Communities has produced standard solutions of PCDDs and PCDFs (di
rty dozen) to guarantee proper calibration and traceability of results
in the certification of these compounds in matrix materials. The puri
ty of each individual isomer has been evaluated on the initial crystal
s using several analytical methods. Solvents have been checked for imp
urities. The entire procedure of preparation of the twelve solutions h
as been performed under strict metrological conditions and will be pub
lished elsewhere. All results and the preparation procedure followed a
re described. The solutions are not certified, but may be obtained fro
m BCR together with an analytical report.