ABSTRACT
Considering their hydrophobic nature, it is perhaps surprising that the chlorinated dibenzop-dioxins (CDD) and chlorinated dibenzofurans (CDF) are of considerable importance to the aquatic environment. The chlorinated CDD and CDF are groups of structurally related compounds. Higher chlorinated congeners have lower aqueous solubility than the lower chlorinated congeners. Sampling procedures and their effect on precision and accuracy of CDD/CDF determinations in environmental samples have not been extensively studied, especially for such matrices as water, sediments, and biota. The major acute effect observed in humans is that of chloracne, which is generally observed after exposure to relatively high concentrations of CDDs/CDFs such as can occur from occupational or accidental exposure. Soxhlet extraction is the preferred technique for recovering CDD/CDF from fly ash. Benzene and toluene are the usual extraction solvents employed. High Performance Liquid Chromatography has been used to analyze CDDs in pentachlorophenol and environmental sampies.
