INFICON — EPA National Air Quality Conference 2012

4 slides from INFICON's conference presentation, 2012

Slide 1: Introduction and Objective
Introduction Benzene, toluene, ethylbenzene, and the three xylene isomers, collectively known as BTEX, are commonly found in industrial processes: burning coal or oil, motor vehicle exhaust, or leaking underground storage tanks. Exposure to these compounds may have adverse health effects; therefore
Slide 2: Materials & Methods
Materials & Methods A fully automated, quantitative method was developed for the INFICON CMS5000 Continuous Monitoring System to monitor BTEX levels in air. • Air Sampling Air is introduced to the instrument through a screened vessel or direct plumb (< 1 atm.) and then drawn into the instrument usin
Slide 3: Method Calibration and Quadratic Calibration Fit
Method Calibration Five concentrations of a liquid BTEX standard were prepared in nitrogen and then analyzed. The concentration range was 1.5 ppbv to 123 ppbv, depending on the molecular weight of each analyte. Sample was collected onto the Tri-Bed concentrator for 2 minutes. The analysis time is ~1
Slide 4: Internal Check Standard, Results and Conclusion
Internal Check Standard The instrument contains an on-board toluene permeation tube, which emits toluene at a consistent rate. Each toluene check standard run establishes a correction factor, which is applied to subsequent data, to compensate for Figure 11: Check Standard slight instrument drift. Re