Development of Needle Trap Technology for On-Site Determinations: Active and Passive Sampling

Abstract

17This study presents a thorough evaluation of new prototypes of extended tip needle trap devices 18 (NT), as well as their application to in situ sampling of biological emissions and active/passive 19 on-site sampling of indoor air. A new NT prototype was constructed with a side hole above the 20 sorbent and an extended tip that fits inside the restriction of the narrow neck liner to increase 21 desorption efficiency.New prototype needles were initially packed with divinylbenzene particles 22 at SGE Analytical Science for the purpose of studying biogenic emissions of pine trees. Prior to 23 their final application, they were evaluated in terms of robustness after multiple use (n ˃ 10), as 24 well as amount extracted of volatile organic compounds (VOCs). An ANOVA test for all the 25 probes showed that at a 95 % level of confidence, there were not statistical differences observed 26 among the 9 NTs tested. In addition, the needles were also packed in laboratory with synthesized 27 highly cross linked PDMS as a frit to immobilize carboxen (Car) particles for spot sampling.

Development of a standard gas generating vial comprised of a silicon oil–polystyrene/divinylbenzene composite sorbent

“…These applications will be especially prominent for on-site applications [21], particularly when combined with portable GC-MS instrumentation. Additionally, such vials would prove very useful for calibration of headspace analysis, instrumentation, sorbent traps, needle traps [22], and many other techniques, as the production of standard mixtures would be readily achievable.…”

In‐field volatile analysis employing a hand‐held portable GC‐MS: emission profiles differentiate damaged and undamaged yellow starthistle flower heads

“…In this study the needle trap system incorporated into the Tridion‐9™ portable GC‐MS system was assessed for its applicability to an agricultural/chemical ecology plant–insect communication project. This unique volatile collection system was designed specifically for either dynamic or static headspace analyses (Asl‐Hariri et al, ) on an existing hand‐held portable GC‐MS system (Fig. ) (Smith et al , ).…”

Volatile organic compound detection as a potential means of diagnosing cutaneous wound infections

“…Zscheppank et al utilized a novel needle trap technique consisting of a sorbent packed needle to sample headspace of E. coli and P. aeruginosa cultured in liquid media and found both organisms produced isoprene …”

“…87 Preti et al sampled the headspace of P. aeruginosa and S. aureus cultured in blood agar medium in Petri culture dishes and identified compounds specific to each species. 94 Zscheppank et al utilized a novel needle trap technique consisting of a sorbent packed needle to sample headspace of E. coli and P. aeruginosa cultured in liquid media 102 and found both organisms produced isoprene. 82 Elgaali et al utilized purge and trap and passive SPME sampling of the headspace to analyze E. coli and S. aureus.…”