place down the column. However, during analysis of the mixture, an initial flow rate decrease takes place as a result of adsorption of carbon monoxide. The normal gas peak obtained for hydrogen in the mixture will be different from that obtained in the calibration, as the column conditions are completely different (5). Such interference has already been reported for another system (6). It occurs regardless of the method used for peak measurement, as both peak height and area are affected by velocity changes ().For optimum operation with thermal conductivity detectors, pressure changes should be kept small. Such changes augment flowr changes and increase errors from this source.Measures for remedying base line instability-which do not minimize pressure changes are satisfactory for the first type of interference, but conditions for analysis may still be far from optimum.Errors caused by the second (veloc-
New vapor pressure data for cobalt have been obtained in the temperature range 1519-1926°K fromKnudsen effusion experiments. The derived third-law heat of vaporization of cobalt is 6.H298o== 101.0±0.6 kcal/mole. Plausible explanations are presented that account for the widely differing vapor pressure data and heats of sublimation published in the literature. It is shown that the evaporation coefficient for cobalt is essentially unity rather than 3X1
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