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The concentrations of common trace gaseous constituents of the atmosphere have been measured in clean air in rural Illinois and Missouri. Sulfur dioxide (S02), nitrogen dioxide (NO2), ammonia (NH3), and aldehydes (RCHO) were removed from the air by 1 hour of wet scrubbing. Hydrogen sulfide (I-I2S) was collected by passing air through an impregnated filter for I or 2 hours. Background concentrations of SO•, NO2, and RCHO ranged from less than I to 5 ppb. The NI-L concentrations were found to be as high as 10 ppb. The H._,S concentrations varied from less than 0.10 to 0.35 ppb. Comparison with previous measurements and with assumed worldwide values indicates that the concentrations of NO2 and I-LS assumed

induced aquation may proceed via a rate-determining, one-electron, redox reaction (outer sphere as in 9a or inner sphere as in 9b) followed by rapid dissociation of anilinium) cation.In acidic aqueous ethylene glycol (G), chromium(II1) forms two different monoglycol complexes; in one, glycol is a monodentate ligand and in the other it is a bidentate ligand. The interconversion of these species is very much faster than the reaction of glycol with hexaaquochromium(II1) ion. (a) the equilibrium quotients QI = [Cr(OH~)sG~+]a,/[Cr(OH~)sa+]a, = 0.35 (60') and QII = [Cr(OH2)4Gaf]a,/[Cr(OHz)sG3+] = 0.17 i 0.06 (15-30'); and (b) the rate laws and rate coefficients: d[Cr(OH2)bG3+l/dt = kl[Cr(OH2)63+]agk-I[Cr-(OHZ)EG~+]U, with kl = 9.0 X (24) R .

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