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Reduced response, nonreproducibility, tailing peaks, and compound degradation are some symptoms caused by a buildup of sample extrac tives at the beginning of the column. The replacement of the precolumn will rejuvenate the column in most cases. Remove the darkened precol umn packing, clean the inside of the affected column tubing with a pipe cleaner wet with acetone, and repack the precolumn with preconditioned support. If the column fails to improve, it will have to be replaced. Some sensitive GLC phases such as DEGS can degrade rapidly when exposed to oxygen or moisture in the carrier gas.
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5th 1982," (J. Miyamoto and P. C. ), vol. 4, p. 101. Pergamon, New York. von Stryk, F. , and Zajacz, G. F. (1969). J. Chromatogr. 41, 125. Winkler, V. W. (1978). In "Analytical Methods for Pesticides and Plant Growth Regulators" (G. Zweig and J. ), vol. X, p. 545. Academic Press, New York. , and Raffke, W. (1977). Nahrung 21, K27. , and Kostowska, B. (1977). Chem. Anal. (Warsaw) 22, 975. , and Howard, S. F. (1966). J. Assoc. Off. Anal. Chem. 49, 1166. , Gonnord, M. , and Guiochon, G. (1983). J.