Passive Sampling Techniques Episode 4

Tham khảo tài liệu 'passive sampling techniques episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Passive sampling in combination with TD and GC to assess chemical exposure 76 S. Wold C. Albano . Dunn U. Edlund K. Esbensen P. Geladi S. Hellberg E. Johansson W. Lindberg and M. Sjostrom Multivariate Data Analysis in Chemistry. In . Kowalski Ed. Chemometrics Mathematics and Statistics in Chemistry D. Reidel Publishing Company Dordrecht Holland 1984. 77 . Sunesson . Nilsson and B. Andersson J. Chromatogr. A 699 1995 203. 83 Chapter 4 Use of permeation passive samplers ỉn air monitoring Bozena Zabiegala and Jacek Namies nik INTRODUCTION Passive sampling is now a well-established method to monitor pollution of air especially indoor air 1-3 . Passive monitoring is generally characterized by the same accuracy as active monitoring but an expensive sampling pump is not needed which is very advantageous. Passive sampling offers considerable potential as a monitoring tool especially for multi-point sampling over large remote areas 2 . The only disadvantage of permeation passive samplers seems to be relatively low sampling rates which requires long sampling times in environments with low pollutant concentrations and the necessity to calibrate passive samplers for each substance due to distinguishing membrane characteristics 4 . However long sampling times at low concentrations can also be viewed as an advantage of the permeation passive sampling as it makes it easy to determine time-weighted average TWA concentrations of analytes. In the overall assessment of the pollutant impact on human health TWA concentrations are more useful than short-term concentrations as they reflect the long-term exposure to these compounds. Permeation samplers collecting gaseous pollutants at a rate controlled by permeation through a non-porous membrane offer unique advantages including effective moisture elimination and small sensitivity to air currents and temperature variations. In the case of indoor air quality measurements they have the additional advantage of being much .

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