Gassmann, E.; Pericles. N.; Anton, K. Anal. Chem. 198g7 61 I 876-883. Finchman. W. H. A.: Freeman, M. H. Opfics, 8th ed.; Butterworths: London, 1974; pp 15-21. Wang, T.; Hartwick, R. A,; Champlin. P. B.A comblnatlon of two dlfferent hydrogen storage alloys was used to assist in the gas chromatographic determlnatlon of trace impurities, such as neon, argon, krypton, methane, and xenon, in nitrogen. Thls system conslsts of a gas chromatograph combined, in series, with two precoiumns filled with WMn-type and Ca-type hydrogen storage alloys. The former alloy efficiently retalns nitrogen at 250 O C and under the pressure of the carrier gas. The latter alloy is used in order to more efficiently adsorb hydrogen, whlch is released from the former alloy, at ambient temperature. By using a photoionlzatlon detector, the detection limits achieved were as follows: 3.7, 0.08, 0.03, 0.04, and 0.09 ppm for Ne, Ar, Kr, CH,, and Xe, respectively.