[en] With the aim of selective stripping voltammetric determination of technetium traces, the radioelement in its +7 state has been separated from interfering substances by solvent extraction with 0.01M tetraphenylarsoniumchloride/chloroform prior to the electroanalytical measurement. In order to avoid back extraction enrichment at the hanging mercury drop electrode (HMDE) by application of a deposition voltage of about -1.6 V (vs. Ag/AgCl), as well as DP cathodic stripping voltammetry has been carried out in the chloroform phase which was made alkaline by the addition of 0.5M sodium hydroxide solution and ethanol as a solubility mediating agent. With the applied composition of the measuring solution (chloroform : 0.5M NaOH : ethanol = 1:0,25:1,6) as well developed current signal at -0.26 V (vs. Ag/AgCl) has been observed. For evaluation of the sampled data according to the standard addition method, standard technetium amounts are directly added to the organic phase. This is allowed, due to the fact that technetium extraction from aqueous sample solution is practically complete. The detection limit was found to be 3x10^-8M Tc. After oxidation to Tc-VII, also technetium originally present as Tc-IV can be extracted and quantified by this way. (orig.)