Trocknung und Veraschung biologischer Proben bei der neutronenaktivierungsanalytischen Spurenelementbestimmung

The changes in the element content of blood serum samples due to drying and ashing procedures were investigated for those trace elements which could be determined by instrumental neutron activation analysis after long-time irradiation (Ag, Co, Cr, Cs, Fe, Rb, Sb, Sc, Se, and Zn). For some elements lower concentrations were found after oven-drying at 90° C and after low temperature ashing than after freeze-drying. In the case of selenium, which is known to form several volatile compounds, no differences could be detected between the freeze-dried, oven-dried and ashed samples.