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Examination of the Mobility Scoring Hierarchy Used to Select Chemicals for the U.S. EPA Contaminant Candidate List Classification Procedure

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What role can regulations and policies assume in controlling compounds of emerging concern? In this policy analysis, the manner in which mobility is ranked in an existing regulation, the Contaminant Candidate List (CCL) classification procedure, is considered, with the realization that mobility data comprise but one part of the complex classification process. The premises of this discussion are three-fold: (1) that consideration of the pH-dependence of the physical properties used to determine chemical mobility is not expressly incorporated into the CCL classification process at present; (2) that consideration of the pH of surface water, drinking water, and wastewater undergoing treatment (commonly pH 7-8) is important to determining the potential mobility of a chemical; and (3) that a "very high" category should be added to the mobility scoring hierarchy in addition to the "low," "medium," and "high" categories currently included in the CCL classification procedure.

Keywords: Drinking Water Regulations; Hydrophobicity; Log D; Log P; Molecular Descriptors; Physico-chemical Properties; Predicting Occurrence of Compounds of Emerging Concern; Unregulated Pollutants

Document Type: Research Article


Publication date: July 29, 2007

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