Abstract
A mechanized system for extractive sample workup for gas chromatography coupled on-line to an on-column injector is described. Extraction is performed in a liquid-liquid segmented flow in a glass coil internally coated with a hydrophobic layer. After extraction the phases are separated with the aid of a hydrophobic membrane supported by a screen coated with Teflon. The organic phase is fed to a loop injector. The system is closed from the atmosphere and was proven to provide rapid and precise workup of seawater samples of the determination of the halocarbons chloroform, bromodichloromethane, dibromochloromethane, bromoform, trichloroethylene, tetrachloroethylene, carbon tetrachloride, and 1,1,1-trichloroethane. Compared to manual extraction, smaller volumes of sample and organic phase are needed. Reliability was tested during a 3-week cruise when 350 seawater samples were processed without system failure. Concentrations down to the picogram-per-liter level in water can be determined, using injection volumes up to 130 /sup +/L.
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