Probenvorbehandlungsstudien mit biologischen und Umweltmaterialien

Summary

The efficiency of wet digestion with nitric acid at 320 °C by use of the high pressure asher published by Knapp [10] has been studied with a series of biological materials which usually are only incompletely decomposed by pressure digestion at 170 °C in PTFE vessels. For that purpose the residual carbon content of the digestion solution was determined by coulometry after combustion in an oxygen stream. The results verify a complete sample digestion already after digestion times of less than 3 h. By the example of bovine liver it is shown that the inverse voltammetric determination of zinc, cadmium, lead and copper is feasible without any subsequent oxidation by perchloric acid and is free of interferences.