Abstract
This chapter presents the analytical methods of sulfur isotope determination on sulfides. Many methods for preparation of SO2 from a variety of sample materials for stable isotope analysis have been derived from quantitative sulfur analytical procedures. Some analysts prefer first to convert sulfides into silver sulfide (Ag2S), because this compound is easily converted (oxidation) into SO2 with good yields. Some sulfides gave problems (bad yields) in direct combustion or produce vapors of elements such as As and Sb, which sublimate into colder parts of the preparation system during combustion. Arsenopyrite has to be pretreated if analyzed in on-line systems for this reason. The advantage of conversion of sulfides into Ag2S is the removal of impurities and silicates from the raw sample materials. Conversion of sulfates into SO2 also suffers from low yields.
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