Development of Intermedia Transfer Factors for Toxic Air Pollutants. Volume 2.Metals and Non-Volatile Organic Compounds

摘要

The objective of this project was to develop information on the transfer of toxicair pollutants between environmental media. This information is needed to support the refinement of the multipathway exposure component of health risk assessmemts. Volume II discusses the metals and non-volatile organic compounds: hexavalent chromium 2,3,7,8 TCDD, benzo(a)pyrene and mercury. The literature was reviewed to obtain estimates of intermedia transfer factors, and pollutants-specific estimates where data were deficient. Calculations for chemical concentration in the various media are reviewed, as are several approaches to calculate partitioning into the non-biological compartments. The report contains references for all data, and include justifications where choices were made for most accurate value. The use of estimated quantities is so indicated, and the basis for each estimate is provided, along with any associated uncertainties.