Odors of ten compounds were characterized by approximately 150 subjects who used a list of 146 descriptors. Duplicate profiles correlated highly (P less than .001) and consistently higher than profiles of different odors. Profiles also agreed with those obtained previously. Thus, profiles based on combined responses of many subjects are stable constructs.

Observers compared the odor of butanol to the odors of various concentrations of 32 chemicals, and also rated the odor pleasantness and unpleasantness of these 32 odorants by a line matching procedure. All stimuli were presented to the observers by air dilution olfactometers. Odor intensity matches between each odorant and butanol were often describable by power functions. A derived magnitude estimate of odor intensity was obtained through a calibration of the butanol concentration scale. Most odorants grew less rapidly in intensity than butanol, and all odorants grew in intensity as decelerating functions of concentration. A more general function of the form P =kl + k2Cks was needed to account for the pleasantness-unpleasantness judgments. In this study, most odorants were rated either neutral or unpleasant. Observers showed far more variability in hedonic judgments than in intensity judgments.

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The kinetics of the reaction of steel with pure hydrogen sulfide at 250~176 may be interpreted in terms of consecutive linear and parabolic rates. In hydrogen sulfide-hydrogen mixtures similar reactions exist, but the reaction rate decreases as the thermodynamic equilibrium line (Fe ~-H~S ~--FeS + HD is approached, in a manner which is approximately proportional to the decrease in the thermodynamic driving force. Increase of pressure up to 20 atmospheres increases the reaction rate by a fractional power of the pressure. In the presence of traces of oxygen, the linear rate component is minimized. The observed kinetics can be explained in terms of three steps: adsorption, rate of formation of diffusing species, and diffusion. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 152.14.136.77 Downloaded on 2015-04-12 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 152.14.136.77 Downloaded on 2015-04-12 to IP Vol. 105, No. 4 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 152.14.136.77 Downloaded on 2015-04-12 to IP

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