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Analyst

Title:		"Developments toward a low-cost approach for long-term, unattended vapor intrusion monitoring"
Author(s):		Patel SV; Tolley WK;
Address:		"Seacoast Science, Inc., 2151 Las Palmas Dr, Suite C, Carlsbad, CA 92011, USA. sanjay@seacoastscience.com"
Journal Title:		Analyst
Year:		2014
Volume:		139
Issue:		15
Page Number:		3770 - 3780
DOI:		10.1039/c4an00736k
ISSN/ISBN:		1364-5528 (Electronic) 0003-2654 (Print) 0003-2654 (Linking)
Abstract:		"There are over 450 000 sites contaminated by chemicals in the US. This large number of contaminated sites and the speed of subsurface migration of chemicals pose considerable risk to nearby residences and commercial buildings. The high costs for monitoring around these sites stem from the labor involved in placing and replacing the passive sorbent vapor samplers and the resultant laboratory analysis. This monitoring produces sparse data sets that do not track temporal changes well. To substantially reduce costs and better track exposures, less costly, unattended systems for monitoring soil gases and vapor intrusion into homes and businesses are desirable to aid in the remediation of contaminated sites. This paper describes progress toward the development of an inexpensive system specifically for monitoring vapor intrusion; the system can operate repeatedly without user intervention with low detection limits (1 x 10(-9), or 1 part-per-billion). Targeted analytes include chlorinated hydrocarbons (dichloroethylene, trichloroethane, trichloroethylene, and perchloroethylene) and benzene. The system consists of a trap-and-purge preconcentrator for vapor collection in conjunction with a compact gas chromatography instrument to separate individual compounds. Chemical detection is accomplished with an array of chemicapacitors and a metal-oxide semiconductor combustibles sensor. Both the preconcentrator and the chromatography column are resistively heated. All components are compatible with ambient air, which serves as the carrier gas for the gas chromatography and detectors"
Keywords:		"Air Pollution, Indoor/*analysis Benzene/*analysis/isolation & purification Chromatography, Gas/economics/*instrumentation Equipment Design Hydrocarbons, Chlorinated/*analysis/isolation & purification Limit of Detection Volatile Organic Compounds/*analysis;"
Notes:		"MedlinePatel, Sanjay V Tolley, William K eng R43 ES020634/ES/NIEHS NIH HHS/ R43ES020634/ES/NIEHS NIH HHS/ Research Support, N.I.H., Extramural Validation Study England 2014/06/07 Analyst. 2014 Aug 7; 139(15):3770-80. doi: 10.1039/c4an00736k"