Membrane-Extraction Ion Mobility Spectrometry for In-Situ Detection of Chlorinated Hydrocarbons in Water

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Analytical Chemistry

DOI:https://doi.org/10.1021/ac100162d· OSTI ID:985762

Du, Yongzhai ^[1]; Zhang, Wei ^[1]; Whitten, William B ^[1]; Li, Haiyang ^[1]; Watson, David B ^[1]; Xu, Jun ^[1]

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1. ORNL

Membrane-extraction ion mobility spectrometry (ME-IMS) has been developed for in-situ sampling and analysis of trace chlorinated hydrocarbons in water in a single procedure. The sampling is configured so that aqueous contaminants permeate through a spiral hollow polydimethylsiloxane (PDMS) membrane and are carried away by a vapor flow through the membrane tube. The extracted analyte flows into an atmospheric pressure chemical ionization (APCI) chamber and is analyzed in a home-made IMS analyzer. PDMS membrane is found to effectively extract chlorinated hydrocarbon solvents from liquid phase to vapor. The specialized IMS analyzer has been found to have resolutions of R=33 and 41, respectively, for negative- and positive-modes and is capable of detecting aqueous tetrachloroethylene (PCE) and trichloroethylene (TCE) as low as 80 g/L and 74 g/L in negative ion mode, respectively. The time-dependent characteristics of sampling and detection of TCE are both experimentally and theoretically studied for various concentrations, membrane lengths, and flow rates. These characteristics demonstrate that membrane-extraction IMS is feasible for the continuous monitoring of chlorinated hydrocarbons in water.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: Work for Others (WFO)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 985762
• Journal Information: Analytical Chemistry, Vol. 82, Issue 10; ISSN 0003-2700
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ION MOBILITY
IONIZATION
MEMBRANES
SAMPLING
ORGANIC SOLVENTS
SPECTROSCOPY
WATER
CHLORINATED ALIPHATIC HYDROCARBONS
CHEMICAL ANALYSIS
MEMBRANE TRANSPORT
Ion mobility spectrometry
Groundwater
Membrane
Chlorinated hydrocarbons
In-situ characterization