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  • Pulsed Discharge Helium Ionization Detector for Highly Sensitive Aquametry.

Pulsed Discharge Helium Ionization Detector for Highly Sensitive Aquametry.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry (2016-02-11)
Curtis D Mowry, Adam S Pimentel, Elizabeth S Sparks, Matthew W Moorman, Komandoor E Achyuthan, Ronald P Manginell
초록

Trace moisture quantitation is crucial in medical, civilian and military applications. Current aquametry technologies are limited by the sample volume, reactivity, or interferences, and/or instrument size, weight, power, cost, and complexity. We report for the first time on the use of a pulsed discharge helium ionization detector (PDHID-D2) (∼196 cm(3)) for the sensitive (limit of detection, 0.047 ng; 26 ppm), linear (r(2) >0.99), and rapid (< 2 min) quantitation of water using a small (0.2 - 5.0 μL) volume of liquid or gas. The relative humidity sensitivity was 0.22% (61.4 ppmv) with a limit of detection of less than 1 ng moisture with gaseous samples. The sensitivity was 10 to 100 to fold superior to competing technologies without the disadvantages inherent to these technologies. The PDHID-D2, due to its small footprint and low power requirement, has good size, weight, and power-portability (SWAPP) factors. The relatively low cost (∼$5000) and commercial availability of the PDHID-D2 makes our technique applicable to highly sensitive aquametry.

MATERIALS
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Sigma-Aldrich
Calcium bromide, AnhydroBeads, −10 mesh, 99.98% trace metals basis