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The combined application of impinger system and permeation tube for the generation of volatile organic compound standard gas mixtures at varying diluent flow rates.

Kim KH, Susaya J, Cho J, Parker D - Sensors (Basel) (2012)

Bottom Line: The performance of the impinger standard gas generation system was assessed for four aromatic VOCs (benzene, toluene, ethylbenzene, and m-xylene; BTEX) at varying flow rates (FR) of 50 to 800 mL·min(-1).Experimental results corrected by such a formula indicate that the compatibility between the APR and MPR generally increased with low FR, while the reproducibility was generally reduced with decreasing flow rate.Although compatibility between different PRs is at a relatively small and narrow FR range, the use of correction formula is recommendable for the accurate use of PT.

View Article: PubMed Central - PubMed

Affiliation: Department of Environment & Energy, Sejong University, Seoul 143-747, Korea. khkim@sejong.ac.kr

ABSTRACT
Commercial standard gas generators are often complex and expensive devices. The objective of this research was to assess the performance of a simplified glass impinger system for standard gas generation from a permeation tube (PT) device. The performance of the impinger standard gas generation system was assessed for four aromatic VOCs (benzene, toluene, ethylbenzene, and m-xylene; BTEX) at varying flow rates (FR) of 50 to 800 mL·min(-1). Because actual permeation rate (APR) values deviated from those computed by the manufacturer's formula (MPR), new empirical relationships were developed to derive the predicted PR (PPR) of the target components. Experimental results corrected by such a formula indicate that the compatibility between the APR and MPR generally increased with low FR, while the reproducibility was generally reduced with decreasing flow rate. Although compatibility between different PRs is at a relatively small and narrow FR range, the use of correction formula is recommendable for the accurate use of PT.

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Dynamic relationship between the measured permeation rate (PR: ng·min−1) and flow rates (FR: mL·min−1) of dilution gas by using impinger system. Labels: MPR = manufacturer given PR; APR = actual measured PR; and PPR = predicted PR using our developed equations.
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f3-sensors-12-10964: Dynamic relationship between the measured permeation rate (PR: ng·min−1) and flow rates (FR: mL·min−1) of dilution gas by using impinger system. Labels: MPR = manufacturer given PR; APR = actual measured PR; and PPR = predicted PR using our developed equations.

Mentions: Based on the manufacturer's given equation, the PR value for a given compound should remain constant at varying diluent FR at any given temperature (Table 4). Hence, to assess the effect of flow rate change on the PR values of BTEX, APR values derived from the corresponding AC data sets were plotted against FR (Figure 3).


The combined application of impinger system and permeation tube for the generation of volatile organic compound standard gas mixtures at varying diluent flow rates.

Kim KH, Susaya J, Cho J, Parker D - Sensors (Basel) (2012)

Dynamic relationship between the measured permeation rate (PR: ng·min−1) and flow rates (FR: mL·min−1) of dilution gas by using impinger system. Labels: MPR = manufacturer given PR; APR = actual measured PR; and PPR = predicted PR using our developed equations.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472869&req=5

f3-sensors-12-10964: Dynamic relationship between the measured permeation rate (PR: ng·min−1) and flow rates (FR: mL·min−1) of dilution gas by using impinger system. Labels: MPR = manufacturer given PR; APR = actual measured PR; and PPR = predicted PR using our developed equations.
Mentions: Based on the manufacturer's given equation, the PR value for a given compound should remain constant at varying diluent FR at any given temperature (Table 4). Hence, to assess the effect of flow rate change on the PR values of BTEX, APR values derived from the corresponding AC data sets were plotted against FR (Figure 3).

Bottom Line: The performance of the impinger standard gas generation system was assessed for four aromatic VOCs (benzene, toluene, ethylbenzene, and m-xylene; BTEX) at varying flow rates (FR) of 50 to 800 mL·min(-1).Experimental results corrected by such a formula indicate that the compatibility between the APR and MPR generally increased with low FR, while the reproducibility was generally reduced with decreasing flow rate.Although compatibility between different PRs is at a relatively small and narrow FR range, the use of correction formula is recommendable for the accurate use of PT.

View Article: PubMed Central - PubMed

Affiliation: Department of Environment & Energy, Sejong University, Seoul 143-747, Korea. khkim@sejong.ac.kr

ABSTRACT
Commercial standard gas generators are often complex and expensive devices. The objective of this research was to assess the performance of a simplified glass impinger system for standard gas generation from a permeation tube (PT) device. The performance of the impinger standard gas generation system was assessed for four aromatic VOCs (benzene, toluene, ethylbenzene, and m-xylene; BTEX) at varying flow rates (FR) of 50 to 800 mL·min(-1). Because actual permeation rate (APR) values deviated from those computed by the manufacturer's formula (MPR), new empirical relationships were developed to derive the predicted PR (PPR) of the target components. Experimental results corrected by such a formula indicate that the compatibility between the APR and MPR generally increased with low FR, while the reproducibility was generally reduced with decreasing flow rate. Although compatibility between different PRs is at a relatively small and narrow FR range, the use of correction formula is recommendable for the accurate use of PT.

Show MeSH
Related in: MedlinePlus