Abstract
The tin(II) iodide reagent reacts with rhodium to form a stable colored complex with an absorption maximum at 460 mμ. The system obeys Beer's law and exhibits a molar absorptivity of 3.9·10 4 at 460 mμ. Rhodium concentrations between 0.4 and 3 p.p.m. can be determined with an average deviation of only 0.3%. The method compares favorably with the tin(II) chloride and bromide methods for rhodium and is considerably more sensitive. Ir, Pd, Pt, Sb, Ti, Cu, Co, Ni and Fe interfere with the method. Consequently, just as is the case with the chloride and bromide reagent, Rh must be separated from most samples prior to an analysis.
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