Nelson and co-workers introduced a quantitative method for disseminating liquid samples to the vapor phase using a lead screw to depress the plunger of a syringe whose tip was mounted into the flow of a carrier gas. In order to measure quantitative vapor-phase infrared spectra, we have modified a commercial device to improve the accuracy and precision for quantitative vapor delivery. Design changes have focused on disseminating reactive or low-volatility liquids by heating only the syringe tip and dispensed liquid. Performance features include quantitative vapor-phase generation with >3 orders of magnitude concentration range, including for low volatility species, with most equilibration times
Revised: November 14, 2006 |
Published: September 27, 2006
Citation
Johnson T.J., S.W. Sharpe, and M.A. Covert. 2006.A Disseminator for Rapid, Selectable and Quantitative Delivery of Low-and Semi-Volatile Liquid Species to the Vapor Phase.Review of Scientific Instruments 77, no. 09:094103.PNNL-SA-50331.doi:10.1063/1.2349298