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Revie Article Open Access Schmidt and Podmore, J Mol Biomark Diagn 2015, 6:6 9 10.4172/2155-9929.1000253 Volume 6 Issue 6 1000253 J Mol Biomark Diagn ISSN:2155-9929 JMBD an open access journal Biomarkers

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ducible chemical sampling technique that could be used by building occupants as a quick and inexpensive means of area sampling. INTRODUCTION Exposure assessments in indoor air environments neces- sitate sampling 1–3

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The term "semi-volatile compounds" refers to organic compounds that possess Henry’s law constants (H) in the range of 10 -5 - 3 x 10 -7 atm*m 3 /mol* and demonstrate higher boiling points, usually greater than that of water with correspondingly low vapor pressure from 10 -14 - 10 -4 atm. *H range defined as volatility from liquid to air.

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Instead of manual sampling in a random way near a source area, this study used trigger sampling guided by an analyzer at a fixed site near a refinery plant to obtain the chemical composition of volatile organic compounds (VOCs) representative of the source. The analyzer was built in