Abstract
A fly ash extract was prepared and studied for the homogeneity and the stability (CRM 429) with respect to five polychlorodibenzo-p-dioxins (D48, D54, D66, D67 and D70) and six polychlorodibenzofurans (F83, F94, F114, F121, F124 and F130). The certification exercise is described; the analytical techniques used for the certification and the quality control guidelines that were followed are also given. The difficulties encountered in the determination of F118 are discussed.
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