PREPARATION AND CERTIFICATION OF A BIOLOGICAL REFERENCE MATERIAL (CARP-1) FOR POLYCHLORINATED DIBENZO-P-DIOXIN AND DIBENZOFURAN CONGENERS

A biological certified reference material for nine 2,3,7,8-chlorine su bstituted dibenzo-p-dioxin and dibenzofuran congeners and nine common polychlorinated biphenyl congeners is available for the first time. Th is material (CARP-1) is in the form of a slurry comprising approximate ly 9 g nf ram homogenate sealed in a glass ampoule. The only foreign m aterials in the slurry are an The only foreign materials in the slurry are an antioxidant added to prevent rancidity and water to facilitate homogenization and ampouling. CARP-1 was found to be homogeneous and stable with respect to its organochlorine concentrations under room as well as elevated temperature storage conditions. The minimum projecte d shelf life for this material is 5 years.