ABSTRACT
A rapid radiochemical method has been designed for the determination of microgram quantities of zinc, based on the substoichiometric isotope dilution, using potassium ethyl xanthate as the extraction reagent. pH 5.5 in acetate buffers and chloroform as the extractant were found to be suitable for quantitative substoichiometric extraction. The influence of the diverse ions on the extraction was studied. The zinc contents of a medicinal preparation and biological samples were determined by the present method.
Subject(s)
Zinc/analysis , Indicators and Reagents , Organometallic Compounds/analysis , Plants/analysis , Thiones , Trace Elements/analysisABSTRACT
An accurate and rapid radiochemical method has been developed for the determination of microgram amount of silver employing potassium ethyl xanthate as a substoichiometric radiochemical reagent. The light yellow coloured silver ethyl xanthate formed was extracted into nitrobenzene from sulphuric acid media. The effect of foreign ions on the extraction was studied. The method was applied to the determination of silver content in photofilm washings.
Subject(s)
Silver/analysis , Thiones , Methods , Motion Pictures , Radiochemistry , Reagent Strips , SolutionsABSTRACT
A radiochemical method has been developed for the determination of microgram amounts of cadmium based on the substoichiometric extraction of its 1:2 complex with potassium ethyl xanthate into 1:4 v/v mixture of pyridine and ethyl acetate from 2.5 M sodium formate. 10-90 micrograms of cadmium was determined with an average error of +/- 1.96%. The method developed was successfully applied to the determination of Cd contents in water samples.
Subject(s)
Cadmium/analysis , Thiones , Water/analysis , Methods , Radiochemistry , Reagent StripsABSTRACT
A radiochemical displacement method for the determination of micro amounts of Hg(II) has been developed. 65Zn was displaced from the Zn-1-(2-pyridylazo-2-naphthol) complex at pH 5 in borate buffers by Hg (II). 10-80 micrograms of mercury could be determined. Interference of various metal ions and methods for suppression have also been carried out.
Subject(s)
Mercury/analysis , Methods , Microchemistry , RadiochemistryABSTRACT
A substoichiometric radiochemical method for the determination of mercury has been developed using 1-(2-pyridylazo)-2-naphthol (PAN) as a chelating agent. The chelate was extracted at pH 9.5 ( Na2CO3NaHCO3 buffer) into chloroform. 15-65 micrograms of mercury was determined with an accuracy +/- 0.9%. Effects of many diverse metal ions have been studied and procedures were developed for the suppression of interference due to these ions.
Subject(s)
Chelating Agents , Mercury/analysis , Naphthols , Radiochemistry/methods , Chloroform , Ions , MetalsABSTRACT
A method for the redox substoichiometric determination of thallium employing chlorate as an oxidant has been developed. The substoichiometric amount of Tl(III) formed was isolated by extraction with isoamyl acetate. 5-50 micrograms of thallium can be determined with an accuracy of +/- 1.3%.
