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Trace analysis of organics in aqueous samples by concentration in plastic tubing and multiplex gas chromatography

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Summary

The inside wall of an uncoated polyethylene capillary traps organic substances from a water sample pumped through it by a nitrogen gas stream. Heating the capillary in a chromatographic oven slowly releases the trapped organic substances from the wall. Nitrogen carrier gas transports sample substances released through a thermal desorption modulator and onto a chromatographic column. Pulsing the temperature of the modulator modulates the concentrations of sample components as they enter the column. Computing the cross correlation of the detector output signal against the applied modulation signal generates the chromatogram. Detection limits below 1 ppb are possible using a flame ionization detector. No sample pretreatment or cold trap is required.

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Author notes

  1. J. B. Phillips

    Present address: Department of Chemistry & Biochemistry, Southern Illinois University, 62901, Carbondale, IL, USA

Authors and Affiliations

  1. Department of Chemical Engineering, Xinjiang Institute of Technology, 830008, Urumqi, Xinjiang, P. R. China

    M. Zhang

Authors
  1. M. Zhang
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  2. J. B. Phillips
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Zhang, M., Phillips, J.B. Trace analysis of organics in aqueous samples by concentration in plastic tubing and multiplex gas chromatography. Chromatographia 39, 294–298 (1994). https://doi.org/10.1007/BF02274516

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  • DOI: https://doi.org/10.1007/BF02274516

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