Interlaboratory testing study on 2,3,7,8-substituted polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran isomer standard solutions

Abstract Carefully prepared isomer standard solutions of all 17 of the 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans and their corresponding crystalline materials were provided to nine environmental analytical laboratories for the purpose of performing a round robin study of the accuracy and reliability of the standard solutions. Consensus values were determined for each isomer. Good correlation was found between the target values and the consensus values.