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The basic chemistry for the immobilization of pertechnetate (TcO 4  − ) by hydrogen sulfide was investigated in aqueous solution under both aerobic and anaerobic environments. Pertechnetate immobilization was acid dependent, with accelerated rates and increased immobilization yields as the acid concentration increased. Oxygen had no effect under acidic conditions. Under anaerobic alkaline conditions, the pH, and therefore the speciation of sulfide, was the determining factor on the immobilization of pertechnetate. Only 53% of the TcO 4  −  was immobilized at pH 8, while the yield increased to 83% at pH 9 as HS −  became the dominant sulfide species. The immobilization yield then decreased to 73% at pH 13. No reaction was observed between TcO 4  −  and sulfide under aerobic alkaline conditions, indicating that oxygen suppressed this reaction.

Pertechnetate immobilization in aqueous media with hydrogen sulfide under anaerobic and aerobic environments