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  • Author or Editor: E. Taskaev x
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Abstract  

Rubidium and cesium were determined in underground mineral waters and sea lye by precipitation with sodium tetraphenyl borate followed by neutron activation. The short lived nuclides86mRb and134mCs were used for the analysis.

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Abstract  

A radiochemical procedure for the consecutive separation of vanadium and molybdenum, copper, manganese, rubidium and potassium is proposed for the analysis of biological materials. Vanadium and molybdenum are extracted together with 0.1% BPHA solution in toluene, copper followed by manganese are extracted as diethyldithio-carbamate complexes with chloroform and rubidium and potassium are precipitated as tetraphenylborates.

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Abstract  

The uranium adsorption on activated carbon from dilute solutions was studied as a function of pH, uranium concentration and ageing time. Optimum conditions for quantitative adsorption of uranium from water solutions were determined: uranium concentration 2.5.10−4 g/l or less; adsorption must be carried out in fresh prepared solutions with ageing time not more than one hour; pH 7.5–8.5; time for achieving the adsorption equilibrium not less than 20 min. The instrumental neutron activation method was used for the uranium analysis.

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Abstract  

Using radiochemical separation, the content of Cu and Ni were determined in French geological standards AN-G (anorthosite) BE-N (basalte) and MA-N (granite). Separation was done by solvent extraction of Cu(II) and Co(III) (reaction58Ni(n, p)58Co) as DDC complexes in CHCl3.

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Abstract  

A method for tracing hot stack gases with indium and its quick analysis by extraction with HDEHP in toluene from aqueous nitric acid followed by neutron activation analysis is described.

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Abstract  

A procedure for platinum and gold determination utilizing, neutron activation combined with radiochemical separation, has been developed. The reaction198Pt (n,
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$Pt\xrightarrow{\beta }$$ \end{document}
is used for Pt determination. Four procedures for gold separation are examined: (1) adsorption on untreated polyurethane foam (UPF). (2) extraction with dibutyl sulphide. (3) reduction of gold to elementary state in conc. H2SO4, and extraction of gold as diethyldithiocarbamate complex. The extraction with Cu(DDC)2 is chosen as the most suitable process and applied to platinum and gold determinations in Bowen's Kale and mice organs, previously treated with Biocisplatinum® specimens.
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Abstract  

Extraction procedure for mercury, arsenic, cadmium, copper and zinc in biological materials is proposed. Mercury and copper are extracted with dithizone followed by the separation of mercury with tri-octyl-amine (TOA). Arsenic, cadmium and zinc are extracted as diethyldithiocarbamates. The procedure is applied for the analysis of some reference materials and autopsy human samples of kidneys, liver, heart, spleen and hair.

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