Trace amounts of Zn /ng.ml–1/ were determined using a displacement reaction of /Zn2+/ org from the dithizone organic phase into the aqueous phase, with a substoichiometric amount of /Hg2+/ aq. The results were compared with direct substoichiometric IDA. Absorption spectrophotometry was used as a reference analysis.
Authors:J. Lesný, Z. Koreňova, J. Tölgyessy, B. Novruzi, and A. Çela
Trace amounts of cadmium were determined by sub- and super-equivalence isotope dilution analysis in model solutions and water samples. Cd/II/ was labelled with109Cd and was extracted in CHCl3 as dithiozonate. AAS was chosen as reference analysis.
Authors:J. Lesný, J. Tölgyessy, L. Čulák, J. Klas, B. Novruzi, and A. Çela
Trace amounts of progesterone were determined by sub- and super-equivalence isotope dilution analysis in model solutions and cow's milk. The samples were labelled with 11--hemi-succinate-/125I/-iodotyrosine methylesther progesterone and the separation of antibody-bound from free hormone was performed by adsorption on carbosorb. RIA-test-PROG M kit /SSR/ was used for reference analysis. The method is suitable for pregnancy testing.