Solid phase microextraction(SPME) is a solvent-free method of sample collection. SPME is an appealing method for sample collection because it is designed for the sampling of trace level analytes with short sampling ti...Solid phase microextraction(SPME) is a solvent-free method of sample collection. SPME is an appealing method for sample collection because it is designed for the sampling of trace level analytes with short sampling times in a variety of environments. Additionally, SPME can be used to directly deliver a sample to a gas chromatograph(GC) for analysis by means of thermal desorption. In this paper, the performance of SPME under dynamic conditions was investigated. Additionally, the competence of SPME sampling for the simultaneous analysis of multiple trace analytes was also evaluated. This work is discussed in the context of underground mine ventilation surveys but is applicable to any industry in which ventilation circuits must be evaluated. The results of this paper showed that the performance of the 100 lm PDMS SPME fiber was both precise and rapid under dynamic conditions. This SPME fiber was also able to simultaneously collect sulfur hexafluoride(SF6) and perfluoromethylcyclohexane(PMCH) with adequate sensitivity.展开更多
The use of sulfur hexafluoride(SF6)as a tracer gas for analyzing underground mine ventilation systems has been practiced for over 30 years.As a result,the methods used to release,sample,and analyze SF6are well accepte...The use of sulfur hexafluoride(SF6)as a tracer gas for analyzing underground mine ventilation systems has been practiced for over 30 years.As a result,the methods used to release,sample,and analyze SF6are well accepted.As the complexity and size of underground mine ventilation networks increase,the ability of a SF6to function as a convenient and rapid means of analysis diminishes.The utilization of multiple tracer gases can mitigate this by removing the need to purge the background presence of a tracer before conducting another release and allowing for a more comprehensive evaluation using multi-zone techniques.Recent studies have identified perfluoromethylcyclohexane(PMCH)as a possible supplement for SF6in underground mine ventilation tracer studies.However,the deployment of PMCH remains a challenge because of this compounds physical properties.This paper evaluates a PMCH permeation plug release vessel(PPRV)under controlled turbulent conditions.The details of the experimental parameters used in the evaluation as well as a discussion regarding the performance of the PPRV are included.展开更多
基金Contract No.200-2009-31933,awarded by the National Institute for Occupational Safety and Health(NIOSH)
文摘Solid phase microextraction(SPME) is a solvent-free method of sample collection. SPME is an appealing method for sample collection because it is designed for the sampling of trace level analytes with short sampling times in a variety of environments. Additionally, SPME can be used to directly deliver a sample to a gas chromatograph(GC) for analysis by means of thermal desorption. In this paper, the performance of SPME under dynamic conditions was investigated. Additionally, the competence of SPME sampling for the simultaneous analysis of multiple trace analytes was also evaluated. This work is discussed in the context of underground mine ventilation surveys but is applicable to any industry in which ventilation circuits must be evaluated. The results of this paper showed that the performance of the 100 lm PDMS SPME fiber was both precise and rapid under dynamic conditions. This SPME fiber was also able to simultaneously collect sulfur hexafluoride(SF6) and perfluoromethylcyclohexane(PMCH) with adequate sensitivity.
文摘The use of sulfur hexafluoride(SF6)as a tracer gas for analyzing underground mine ventilation systems has been practiced for over 30 years.As a result,the methods used to release,sample,and analyze SF6are well accepted.As the complexity and size of underground mine ventilation networks increase,the ability of a SF6to function as a convenient and rapid means of analysis diminishes.The utilization of multiple tracer gases can mitigate this by removing the need to purge the background presence of a tracer before conducting another release and allowing for a more comprehensive evaluation using multi-zone techniques.Recent studies have identified perfluoromethylcyclohexane(PMCH)as a possible supplement for SF6in underground mine ventilation tracer studies.However,the deployment of PMCH remains a challenge because of this compounds physical properties.This paper evaluates a PMCH permeation plug release vessel(PPRV)under controlled turbulent conditions.The details of the experimental parameters used in the evaluation as well as a discussion regarding the performance of the PPRV are included.
