There has been considerable ...
Published by Terry Scheurman, President at Applied Specialties, Inc.
There has been considerable work done especially considering that folks have been trying to find better ways to oxidize ferrous to ferric sulfate for a long time. Also the use of Ferric salts to oxidize sulfides. Much of your question will be determined by which sulfur compounds you may reference. Sulfides, thionates, mercaptans, etc.