Rhodium is known for its stability in different corrosive envi-ronments, physical beauty and unique chemical properties. The
recent interest in the medical and industrial significance of
rhodium has been accompanied by an increasing interest in
rhodium micro determination.
Since rhodium has been introduced into catalytic converters,
approximately 73% of the world production of rhodium is con-sumed in the production of autocatalysts [1,2]. Efforts were made
to assess their impact on the environment with respect to the
emission of noble metals. During the first years of automobile cat-alyst impact research, the focus lay on Pt as the main component of
Pt/Rh-catalysts. Consequently, much effort was invested in the
development of analytical methods possessing sufficient detection
capacity. Pt levels of a variety of environmental matrices are
already known [3]. However, corresponding Rh data are mostly
missing. Analytical intercomparison projects have been performed
in order to supply information on the applicability of different
methods of Pt analysis [4–6].