Abstract
The applicability of a glass/Ag, Ag 2S (silver sulfide coated silver) electrode, which is capable of selectively detecting the H 2S fraction of total reduced inorganic sulfur (S tot) concentration in biological systems is demonstrated. This electrode was used to monitor photosynthetic sulfide oxidation by Chlorobium phaeobacteroides. The electrode was resistant to Pfennig's medium and bacterial attack and after five months of use showed a potential drift within ±2 mV corresponding to ±13% maximum. The results obtained in a batch type experiment of growth of Chlorobium at different pH values suggest that Chlorobium cells preferentially take up the HS − ion rather than H 2S.
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