C-Depth Method to Determine Diffusion Coefficient and Partition Coefficient of PCB in Building Materials

Environmental Science & Technology
Cong LiuYinping Zhang

Abstract

Polychlorinated biphenyls (PCBs) have been found to be persistent in the environment and possibly harmful. Many buildings are characterized with high PCB concentrations. Knowledge about partitioning between primary sources and building materials is critical for exposure assessment and practical remediation of PCB contamination. This study develops a C-depth method to determine diffusion coefficient (D) and partition coefficient (K), two key parameters governing the partitioning process. For concrete, a primary material studied here, relative standard deviations of results among five data sets are 5%-22% for K and 42-66% for D. Compared with existing methods, C-depth method overcomes the inability to obtain unique estimation for nonlinear regression and does not require assumed correlations for D and K among congeners. Comparison with a more sophisticated two-term approach implies significant uncertainty for D, and smaller uncertainty for K. However, considering uncertainties associated with sampling and chemical analysis, and impact of environmental factors, the results are acceptable for engineering applications. This was supported by good agreement between model prediction and measurement. Sensitivity analysis indicated that ...Continue Reading

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Citations

Jul 18, 2017·Environmental Science & Technology·Jianping CaoYinping Zhang
Mar 15, 2018·Angewandte Chemie·Tunga SalthammerCharles J Weschler

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