Field Portable Low Temperature Porous Layer Open Tubular Cryoadsorption Headspace Sampling and Analysis Part II: Applications*
Megan Harries, Santiago Bukovsky-Reyes, Thomas J. Bruno
This paper details the sampling methods used with the field portable PLOT-cryoadsorption (PLOT-cryo) approach, described in Part I of this two-part series, applied to several analytes of interest. We conducted tests with coumarin and 2,4,6-trinitrotoluene (two solutes that were used in initial development of PLOT-cryo technology), aviation turbine kerosene, and diesel fuel, on a variety of matrices and test beds. We demonstrated that these analytes can be easily detected and reliably identified using the portable unit. By leveraging the apparatus' efficiency-boosting temperature control and the high flow rate multicapillary PLOT wafer, very short collection times (as low as 3 s) yielded accurate detection. For diesel fuel spiked on glass beads, we determined a method detection limit of well below 1 ppm. We observed greater variability among separate samples analyzed with the portable unit than previously documented in work using the laboratory-based PLOT-cryo technology. We identify three likely sources that may help explain the additional variation: the use of a compressed air source to generate suction, matrix geometry, and variability in the local vapor concentration around the sample probe as solute depletion occurs both locally around the probe and in the test bed as a whole.
, Bukovsky-Reyes, S.
and Bruno, T.
Field Portable Low Temperature Porous Layer Open Tubular Cryoadsorption Headspace Sampling and Analysis Part II: Applications*, Journal of Chromatography, [online], https://doi.org/10.1016/j.chroma.2015.12.014, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918822
(Accessed February 20, 2024)