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

Journal Article · Fri Jan 01 04:00:00 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 Laboratory (ORNL)
• Sponsoring Organization: ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 985762
• Journal Information: Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 10 Vol. 82; ISSN 1520-6882; ISSN 0003-2700
• Country of Publication: United States
• Language: English

Related Subjects

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