Partition Coefficients of Organic Contaminants with Carbohydrates

In view of the current lack of reliable partition coefficients for organic compounds with carbohydrates (Kch), carefully measured values with cellulose and starch, the two major forms of carbohydrates, are provided for a wide range of compounds: short-chain chlorinated hydrocarbons, halogenated benzenes, alkyl benzenes, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls, and organochlorine pesticides. To ensure the accuracy of the Kch data, solute concentrations in both water and carbohydrate phases are measured by direct solvent extraction of the samples. For a given compound, the observed partition coefficient with cellulose (Kcl) is virtually the same as that with starch (Kst). This finding expedites the evaluation of organic contamination with different forms of carbohydrates. The presently determined Kch values of 13 PAHs are substantially lower (by 3−66 times) than the literature data; the latter are suspect as they were obtained with (i) presumably impure carbohydrate samples or (ii...