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(80-78) Wind effects on Air sampling using Semipermeable membrane devices (SPMDs) with Performance Reference Compounds (PRCs). Söderström, Hanna*,1, Bergqvist, Per-Anders1, 1 Environmental Chemistry, Umeå University, Umeå, SE ABSTRACT- Semipermeable membrane devices (SPMDs) with added Performance Reference Compounds (PRCs) were used to evaluate the wind effect on integrating air sampling. A wind tunnel was constructed providing flow velocities between 3-15 m/s. Four sampling devices were deployed in the wind tunnel and a flow of ambient air was used. In addition, the ambient air was sampled in outdoor and stationary flow conditions. The 16 EPA priority PAHs, 5 alkylated PAHs and 10 PCBs were analysed with GC/MS. The absorbed amount of PAHs and PCBs were in the range 216-577 ng/SPMD and 2,5-9,4 ng/SPMD, respectively, with similar PAH and PCB pattern for all the sampling stations. The higher absorbed amount of PAHs was probably due to higher air concentrations but also the higher sampling rate for PAHs. The wind velocity had a positive effect on the release of PRCs. The exchange rate constant, ke for PRC-phenantrene was 7.5 times higher under conditions of high wind velocity compared to no wind effect and the release of PRC-pyrene was increasing with about 4.5 times. Key words: Air sampling, Sampling rate, Wind effect, Performance Reference Compounds (PRCs) |
