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ever, is that because of its small size, only a very small fraction of the entire eluate is sampled and thus the microvoltammetric electrode is much less sensitive than conventional bulk detectors. Experiments designed to remove this disadvantage are currently being pursued. LITERATURE CITED(1) Knecht, L. A.; Guthrle, E. Myers, M. N.; Schemer, P. D.; W i n g s , J. C. Anal. Chem. 1969, 41, 889-892. (IO) Kirkland, J. J.; Yau, W. W.; Stoklosa, H. J.; Dilks, C. H., Jr. J . Chromatogr. Sci. 1977, 15, 303-316. (11) Foley, J. P.; Dorsey, J. G. Anal. Chem. 1983, 55, 730-737. (12) Dayton, M. A.; Brown, J. C.; Stutts. K. J.; Wlghtman, R. M. Anal. Chem. 1980. 52, 946-950. (13) Wlghtman, R. M.; Wlpf. D. 0. I n Electroenalyticel Chemkhy; Bard, A. Factors aff ectlng the reproduclbilHy of organic laser mass spectrometry have been studied. Laser focus, laser power denslty, sample preparatlon method, and Chemical effects contrlbute significantly to the variabtlity of the mass spectra. Defocuslng the laser enhances production of structurally slgniflcant organlc ions. The yield of organic molecular Ions Is

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Negative Ion laser mass spectra of many aromatic nitro compounds show formation of an Ion corresponding to ( + 0 -H)™ formed by an Ion-molecule reaction. It was established that Interaction of N02™ with neutral molecules Is responsible for formation of ( + O -H)". The presence of substituents like -Cl and -S03~I n aromatic nitro compounds leads to formation of ( + 0 -Cl)™ and ( + 0 -S03Na)~, respec-

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