Determination of platinum in plants by emission spectrometry after preconcentration on modified silicagel.
Silicagel Separon SGX C18 (particle size 7 microm) was suitable for the preconcentration of 2-20 microg of Pt from 0.1M hydrochloric acid in the presence of cationic surfactants especially dimethyllaurylbenzylammonium bromide, with subsequent elution with 96% ethanol. The recovery was 86-110% for 2 microg of Pt. The sample matrix corresponding to 2.5 g of average plant ash does not interfere. The final emission spectrometry of platinum was carried out in 15 A dc-arc at Pt I 265.942 nm in the presence of Au as internal standard (Au I 267.595 nm). RSD was 6.3% in average.
Otruba
V
V
Department of Analytical Chemistry, Masaryk University, 611 37 Brno, Czech Republic.
Strnadová
M
M
Skalníková
B
B