The Scentograph Plus II portable gas chromatograph is designed to monitor volatile organic compound (VOC) emissions from hazardous waste sites and other emission sources. It operates by drawing air through a sorbent bed, followed by rapid thermal desorption into the carrier stream. The instrument operates in either argon ionization or electron-capture modes.
The Scentograph Plus II portable gas chromatograph can operate for several hours on internal batteries and has internal carrier gas and calibration tanks. It can be fitted with capillary columns (30 meters, 0.32 or 0.53 millimeter) or packed columns. The instrument can be operated isothermally at temperatures ranging from ambient to 179 °C. Oven temperatures can be programmed at a desired rate. The 11.7- electron-volt ionization energy allows a detection limit of about 1 part per billion. The instrument is controlled by a detachable IBM personal computer or compatible laptop computer (see figure below).
Scentograph Plus II Portable Gas Chromatograph
The Scentograph Plus II portable gas chromatograph can monitor VOC emissions from hazardous waste sites and other emission sources.
The Scentograph Plus II portable gas chromatograph was evaluated in January 1992 at a Superfund site under remediation. Results from this demonstration are presented in a peer-reviewed article titled "Evaluation of Portable Gas Chromatographs" in the Proceedings of the 1993 U.S. EPA/Air and Waste Management Association International Symposium, VIP-33, Volume 2, 1993.
The technology was also evaluated in June 1994 at a landfill adjacent to a residental area. Results from this demonstration are presented in a peer-reviewed article titled "On-Site Monitoring of Vinyl Chloride at Parts Per Trillion Levels in Air" in the Proceedings of the 1995 U.S. EPA/Air and Waste Management Association International Symposium, VIP-47, Volume 1, 1995.
The Scentograph Plus II portable gas chromatograph was also evaluated during a field study in August 1995. During the study, downwind vapors from an artificial source generator were analyzed. Preliminary results of the demonstration were presented in an article titled "Performance Comparison of Field-Deployable Gas Chromatographs with Canister TO-14 Analyses" in the Proceeding of the 1996 U.S. EPA/Air and Waste Management Association International Symposium, VIP-64, 1996.
EPA PROJECT MANAGER:
Richard Berkley
U.S. EPA
National Exposure Research Laboratory
MD-44
Research Triangle Park, NC 27711
919-541-2439
Fax: 919-541-3527
TECHNOLOGY DEVELOPER CONTACT:
Amos Linenberg
Sentex Systems, Inc.
553 Broad Avenue
Ridgefield, NJ 07657
201-945-3694
Fax: 201-941-6064