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DEVELOPMENT OF A SMALL CHAMBER METHOD FOR SVOC SINK EFFECT STUDY
Citation:
Liu, X., N. Roache, AND M. Allen. DEVELOPMENT OF A SMALL CHAMBER METHOD FOR SVOC SINK EFFECT STUDY. In Proceedings, THE 13TH INTERNATIONAL CONFERENCE ON INDOOR AIR QUALITY AND CLIMATE, Hong Kong, CHINA, July 07 - 12, 2014. US Environmental Protection Agency, Cincinnati, OH, 1-8, (2014).
Impact/Purpose:
Understanding the transport mechanisms of semivolatile organic compounds (SVOCs) between sources, air, house dust, and interior surfaces in the residential environment is essential for estimating indoor SVOC exposure and developing strategies that enlighten risk assessments and policy decisions to minimize exposures and protect human health. To characterize the sink effect of SVOCs in the indoor environment, small chamber tests are often conducted. However, the adsorption of SVOCs by the chamber walls is significant. To overcome this experimental difficulty, a new chamber designed to measure the SVOC concentrations in the outlet air of the chamber and in the sink materials was fabricated and tested in the study.
Description:
This paper describes the details of the improved chamber system and reports the sink effect study for organophosphorus flame retardants (OP-FRs), including tris(2-chloroethyl) phosphate(TCEP), tris(1-chlor-2-propyl) phosphate (TCPP) and tris(1,3-dichloro-2-propyl) phosphate (TDCPP) on the empty stainless steel chamber wall. The data are used to evaluate the reliability of the Langmuir sorption model for nonporous and impenetrable materials. The new chamber system will be used in an experimental method that was developed to measure the sorption concentrations of the SVOCs and to estimate the partition and diffusion coefficients by fitting a sink model with experimental data in the future.