Simultaneous determination of sulfide, polysulfides and thiosulfate as an aid to ore exploration |
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| Authors: | Jacques Boulgue |
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| Institution: | Jacques Boulègue |
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| Abstract: | The interaction of water and sulfide minerals yields dissolved species which can be utilized to trace back the presence of sulfide minerals and associated minerals. Computer modeling and laboratory and field results show that the most characteristic dissolved species are hydrogen sulfide (H2S, HS−), polysulfide ions (Sn2−) and thiosulfate (S2O32−), derived from the hydrolysis of sulfide minerals. Typical concentration ranges are: 10−5 – 10−7 mole/l for hydrogen sulfide, 10−6 – 10−9 mole/l for polysulfides and 10−5 – 10−8 mole/l for thiosulfate. The chemical reactivity of these species at contact with air makes them difficult to assess unless determined immediately after sampling.These sulfur species can be determined rapidly and accurately in field conditions by simultaneous titration with mercuric chloride employing an Ag/Ag2S electrode for the determination of the end points.The application to ore exploration is exemplified by the results of the research on roll-type uranium deposits in the southwest of France. |
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