Instrumentation operation will b e required before these detectors become a n accepted reality. Also expected in t h e future will b e gradual i m p r o v e m e n t s in t h e more popular detectors such a s t h e T C D , F I D , a n d E C D . F o r o p t i m u m per formance with a n y detector, a t t e n t i o n m u s t b e paid t o t h e entire system, i n cluding flow a n d t e m p e r a t u r e control and removal or minimization of con t a m i n a n t sources.
A rare and special catalog of rare and special gases. Free. To the buyer and user of rare and specialty gases. We would like to send you a copy of our new catalog of rare and spe cialty gases which describes our u n i q u e line of u l t r a - h i g h p u r i t y gases, standard gas mixtures and related e q u i p m e n t . The c a t a l o g also tells who we are and why you really should get to know us. MG Scientific Gases, A Division of MG Technical Products, Inc., 240 Madison Avenue, New York, N.Y. 10016, Tel.: (212) 889-2421
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(17) R. Villalobos, ISA Trans. 7, 38 (1968). (18) H . P . Williams and J. D . Winefordner, J. Gas Chromatogr. 6, 11 (1968). (19) J. R . Penton and C. H . Hartmann, submitted for publication in J. Chromatogr. (20) H . W. Grice and D . J. David, J. Gas Chromatogr. 7, 239 (1969). (21) D . M . Coulson, Amer. Lab. 1969, ( M a y ) , ρ 22. (22) D . M . Coulson, J. Gas Chromatogr. 3 (4), 134 (1965). (23) A. B . Littlewood and W. A. Wise man, / . Gas Chromatogr. 5 (7), 334 (1967). (24) R. P . W. Scott, "Gas Chromatog raphy 1966," Α. Β. Littlewood, Ed., I n stitute of Petroleum, London, 1967, ρ 318. (25) J. T . Watson, "Ancillary Techniques of Gas Chromatographv," L. S. E t t r e and W . H . McFadden, Eds., Wiley, New York, 1969, ρ 745. (26) C. Merritt, Ajrpl. Spectrosc. Rev. 3 (2), 263 (1970). (27) W.
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