Abstract
In acidic aqueous hydrogen sulfide solutions, sulfur particles of very narrow size distribution were produced by air oxidation after an initial induction period. The formation of sulfur was most rapid around pH 6 and very slow below pH 3. The induction period was decreased by increase in hydrogen sulfide concentration and in partial pressure of oxygen. In the presence of traces of metal ions, the induction period decreased in the order Zn 2+ > Ni 2+ > Cu 2+ > Co 2+ > Fe 2+. The reaction was catalyzed and the induction period was decreased by Al 3+ and Fe(CN) 6 4t- ions. Addition of KCl, K 2SO 4, or MgCl 2 did not affect the reaction. In all cases, the growth of the sulfur particles was diffusion controlled, and higher-order Tyndall spectra (HOTS) were observed. Particle size was determined by dissymmetry and the HOTS method, using a new set of calculated curves.
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