Optimizing electron-capture detector performance for gas chromatographic analysis of polychlorinated biphenyls |
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Authors: | C -Y Chen Y -C Ling |
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Institution: | (1) Department of Chemistry, National Tsing Hua University, 300 Hsinchu, Taiwan, Republic of China |
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Abstract: | Summary A modified simplex technique has been applied to optimize the performance of an electron-capture detector under constant-current and constant-frequency pulse modes for the gas chromatographic analysis of polychlorinated biphenyls. Optimal performance was obtained by adjusting the four experimental parameters of pulse voltage, detector temperature, make-up gas flow rate, and reference current (or pulse frequency) using the signal-to-noise ratio of the eluting peak as the criterion. The results show that constant-current pulse mode has better sensitivity and dynamic range whereas the constant-frequency pulse mode has the lower detection limit. Subsequent principal component factor analysis indicated that similar performance is achievable using only three parameters. |
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Keywords: | Gas chromatography Electron-capture detector Polychlorinated biphenyls Simplex optimization Principal component factor analysis |
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