Multi-stage preconcentrator/focuser module designed to enable trace level determinations of trichloroethylene in indoor air with a microfabricated gas chromatograph

This mini-review focuses on the latest developments in the field of micro- and nanostructures in gas chromatography (GC). Significant progress has been made in recent years in designing miniaturized structures, for example, structures based on cyclodextrins. These are now commercially available and thus not the topic of this short review. Rather, we concentrate here on on-going research activities on nanoparticles, micro-electromechanical systems (MEMS) and metal-organic framework (MOF) supports as well as state-of-the-art column geometries, with particular emphasis on lab-on-a-chip columns, which undoubtedly will find their way into regular GC developments in the future.

show abstract

“…This is currently followed by the MEMS GC technology for fieldportable, battery-operated applications in the near future. [57][58][59][60] …”

Section: Discussionmentioning

confidence: 99%

Micro- and nanostructures and their application in gas chromatography

Mittermüller

Volmer

2012

Analyst

View full text Add to dashboard Cite

show abstract

“…These devices were optimized for selective TCE sampling in a previous study [19]. Two mini-pumps and a manifold with six mini-valves were appropriately actuated for sampling, focusing, and separation flows.…”

Section: Micro Focuser Pre-trap and Samplermentioning

confidence: 99%

Field testing of a rugged MEMS gas chromatograph prototype: Selective analysis of trace-level TCE vapors in contaminated homes

Kim

Chang

Bryant

et al. 2011

2011 16th International Solid-State Sensors, Actuators and Microsystems Conference

View full text Add to dashboard Cite

Two fully integrated and automatically controlled MEMS gas chromatographs (µGC) were successfully deployed in the field to monitor trichloroethylene (TCE) at trace-level concentrations (0.6-80 ppb) in homes suffering from vapor intrusion (VI) from surrounding TCE-contaminated soil. Each instrument combines a high-volume sampling module (non-microfabricated) with a microanalytical module consisting of a microfocuser, dual microcolumns, and a chemiresistor array detector. A complete sampling and analytical cycle requires 15-30 min, depending on required sensitivity. Limits of detection as low as 0.02 ppb were achieved. TCE was separated from 45 co-contaminants. Use of the prototypes in fixed-site (temporal TCE fluctuations) and portable operating modes (spatial mapping of TCE) was successfully demonstrated. Good agreement with concentrations determined with standard reference methods was achieved.

show abstract

“…Laboratory development and characterization of the multi-stage PCF module and the SPIRON prototype µGC are presented in Sukaew et al, 2011 andKim et al, 2011, respectively. Presented in this section is a general description of the technology. A more detailed description of the prototype µGC development and characterization is presented in Section 5.2: Laboratory Study Results.…”

Section: Technology Descriptionmentioning

confidence: 99%

Application of Advanced Sensor Technology to DoD Soil Vapor Intrusion Problems

Reisinger¹,

Burris²,

Zellers³

2012

Self Cite

View full text Add to dashboard Cite

The public reporting burden for this coll.etion of infOfmatlon is tstlm attd to av..-a~ 1 hour per response, including the time for reviewing in.ttnJction:, :earching exi:ting data :ourcc:. gathering and maintaining dle data needed, and COt'Tl)letiog and revtewing the collection of information. Send commtntc regarding thic burden utima1e or any other aspect of thic co llection of inform.-bon, including suggestions for reducing the burden, to the Department of Defense. Executive Servitas and Commu nie.ations Oir.etorate (0704•0188). R"pondents c.hould be aware that notwithstanding any othet prov1sion of law, no .,.,uon shall be subject to any penalty fo r failng to comply with a col!ection of information if it does not d isplay a curtentfy valid OMS control number. This study demonstrated the use of a unique prototype gas chromatograph with sensor array detection, the analytical components of which are microfabricated from Si (micro-GC), for analysis of indoor air concentrations of trichloroethylene (TCE) at low-and sub•ppb levels, related to vapor intrusion (VI) applications. The objectives of this study were to demonstrate the performance of the prototype micro-GC in two operating modes: portable mode for forensic and spatial monitoring; and fixedlocation mode for longer term temporal monitoring (exposure estimation). Results from the micro•GC and from T0-15 reference samples were compared. Above the mitigation action level (MAL; 2.3 ppb), the micro-GC accurately determined TCE under complex field matrix conditions. Below the MAL, TCE micro-GC determinations were positively biased due to unresolved interferences. This study stands as the first of its kind, where micro-GC instrumentation was shown capable of sustained, reliable , automated measurements of a trace-level component (TCE) in a complex VOC mixture in real-world environments. 15. SUBJECT TERMS vapor intrusion, micro-gas chromatograph, indoor air analysis 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF a.

show abstract

Multi-stage preconcentrator/focuser module designed to enable trace level determinations of trichloroethylene in indoor air with a microfabricated gas chromatograph

Cited by 36 publications

References 36 publications

Micro- and nanostructures and their application in gas chromatography

Micro- and nanostructures and their application in gas chromatography

Field testing of a rugged MEMS gas chromatograph prototype: Selective analysis of trace-level TCE vapors in contaminated homes

Application of Advanced Sensor Technology to DoD Soil Vapor Intrusion Problems

Contact Info

Product

Resources

About