Abstract
The adsorption of hydrogen chloride and water vapor on sandy soil has been studied. Characterization of the soil was performed using scanning electron microscopy (SEM), particle size distribution, neutron activation analysis, BET nitrogen surface area measurements, and electron spectroscopy for chemical analysis (ESCA). Water vapor and hydrogen chloride adsorption isotherms at 30°C were measured on soil after outgassing at 100°C. The heats of immersion of the soil outgassed at 100°C were determined in both water and 0.1 N hydrochloric acid solution to complement the vapor-phase measurements. ESCA spectra of soil were obtained before and after exposure to hydrogen chloride. The results are compared with similar measurements on a-quartz. The acidity of soil slurries was measured as a function of time on addition of HCl(aq) to various size fractions. Implications regarding possible roles of sandy soil entrained in solid rocket exhaust clouds are discussed.
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