TY - JOUR

T1 - The properties of chromatomembrane cells in flow systems coupled to gas chromatography - Analysis of volatile organic compounds

AU - Bloch, Carsten

AU - Simon, Jürgen

AU - Moskvin, Leonid N.

AU - Rodinkov, Oleg V.

N1 - Funding Information: The authors thank the Deutsche Forschungsgemeinschaft (DFG) and the Russian Foundation for Fundamental Research (RFFI) for the support of this work.

PY - 2000/5/31

Y1 - 2000/5/31

N2 - The economical use of modern analytical instrumentation requires an online-coupling of efficiently working flow-systems which automate both sampling and sample pretreatment. Whenever extraction and preconcentration procedures are necessary the application of chromatomembrane cells proved to be very worthwhile. On this occasion the analyte exchange takes place inside a block of biporous PTFE wherein the two immiscible phases come into contact with each other. A special enclosure enables water and the extracting nitrogen to flow independently through that block. In case of gaseous extractants the behavior of the biporous PTFE and its mechanical parameter have to be investigated precisely in order to overcome the special problems of trace analysis in gases. The gas-chromatographic detection of volatile organic compounds (VOC's) requires a discussion on the effects of gas- sorption and the kinetics of equilibration which should be taken into consideration for using the chromatomembrane cell as an extractor from waste water. The investigation realizes at least that a quick pretreatment is made possible and, however, sample sizes decrease remarkably in comparison with competing methods as head space analysis or purge and trap technique. The application of chromatomembrane cells permits reasonable accuracies with a limit of detection on the ng/l level. (C) 2000 Elsevier Science B.V.

AB - The economical use of modern analytical instrumentation requires an online-coupling of efficiently working flow-systems which automate both sampling and sample pretreatment. Whenever extraction and preconcentration procedures are necessary the application of chromatomembrane cells proved to be very worthwhile. On this occasion the analyte exchange takes place inside a block of biporous PTFE wherein the two immiscible phases come into contact with each other. A special enclosure enables water and the extracting nitrogen to flow independently through that block. In case of gaseous extractants the behavior of the biporous PTFE and its mechanical parameter have to be investigated precisely in order to overcome the special problems of trace analysis in gases. The gas-chromatographic detection of volatile organic compounds (VOC's) requires a discussion on the effects of gas- sorption and the kinetics of equilibration which should be taken into consideration for using the chromatomembrane cell as an extractor from waste water. The investigation realizes at least that a quick pretreatment is made possible and, however, sample sizes decrease remarkably in comparison with competing methods as head space analysis or purge and trap technique. The application of chromatomembrane cells permits reasonable accuracies with a limit of detection on the ng/l level. (C) 2000 Elsevier Science B.V.

KW - Chromatomembrane cell

KW - Flow injection analysis

KW - Gas chromatography

UR - http://www.scopus.com/inward/record.url?scp=0034738096&partnerID=8YFLogxK

U2 - 10.1016/S0039-9140(00)00315-5

DO - 10.1016/S0039-9140(00)00315-5

M3 - Article

AN - SCOPUS:0034738096

VL - 52

SP - 123

EP - 128

JO - Talanta

JF - Talanta

SN - 0039-9140

IS - 1

ER -