2–15 g of mercury has been determined by exchange with zinc in65Zn labelled zinc sulphide. The influence of various ions which are likely to interfere in the determination of mercury has also been studied.
A sensitive and rapid radiochemical method has been developed for the determination of microgram amounts of mercury by substoichiometric extraction of its 12 complex with potassium benzyl xanthate into chloroform from pH 5.5 acetate buffer. The influence of various foreign ions on the extraction was studied. 2–20 g of mercury was determined with an average error of 1.78%. The method developed was utilized to determine the mercury content of water samples.
The specific surface area of mercuric oxide has been measured by heterogeneous isotope exchange, gas adsorption, air-permeability and microscopic methods. Values obtained by the four methods were compared and explanations given for the observed differences.
The present work deals with the determination of Cr/III/ by means of the substoichiometric isotope dilution method, using PAN, 1-/2-pyridylazo/-2-naphthol as a complexing agent. Chromium forms a 12 complex with PAN. Heating to 90°C for 3 min was necessary for complete complexation. The complex was extracted into chloroform at pH 3.5 /acetate buffer/. Tens of micrograms of chromium could be determined. Effect of diverse metal ions was also studied.
The comparative extractability of zinc with potassium salts of ethyl, propyl, butyl, pentyl, and benzyl xanthates from the pH range of 3.5–9.0 into chloroform has been studied, employing a sensitive and rapid substoichiometric radiochemical method. The extent of reproducibility was tested in each case. The effect of associated ions on the extraction was studied. The amount of zinc present in the standard solutions was determined employing each xanthate separately. The zinc content present in geological water samples in and around Tirupati was determined by the method developed and compared with the values obtained by Atomic Absorption Spectrophotometry.
A sensitive and rapid radiochemical method has been developed for the determination of microgram amounts of indium(III) based on the substoichiometric extraction of its 13 complex with potassium ethyl xanthate from pH 7 ammonia buffer into chloroform. 5–50 g of indium was determined with an average error of 1.56%. The effect of associated species on the extraction was studied.
A rapid and sensitive substoichiometric radiochemical method has been developed for the determination of microgram amounts of antimony employing potassium ethylxanthate as a reagent and chloroform as an extractant from sulfuric acid medium. The effect of associated ions on the extraction was studied. The method developed was successfully applied to determine the antimony content in standard solutions and synthetic mixture with an average error ±2.07%
The relative extent of extraction of mercury with potassium salts of ethyl, propyl, butyl, pentyl and benzyl xanthates has been studied employing a sensitive and rapid substoichiometric radiochemical method. The effect of pH on the extractability of mercury xanthate complexes into chloroform was investigated. Buffer solutions of pH 12, 11, 10, 9 and 5.5 were found to be suitable media for the maximum extraction of mercury as ethyl, propyl, butyl, pentyl and benzyl xanthate complexes, respectively. The procedures developed were utilized for the determination of mercury content in standard solutions and geological water samples collected in eight parts of Chittoor district of Andhra Pradesh.
The possibility of using PAN as a reagent for the substoichiometric determination of nickel and manganese has been investigated. Nickel forms a 11 red colour and manganese a 12 wine red colour complex with PAN, which are extractable into chloroform at pH 5.5 and 9.1, respectively. Tens of micrograms of Ni/II/ and Mn/II/ were determined with an accuracy 0.5% and ±0.2%, respectively. The effect of various metal ions was also studied.
A radioanalytical method based on substoichiometric principles has been developed for the extraction and determination of antimony/III/ with 1-/2-pyridylazo/-2-naphthol /PAN/. Antimony/III/ forms a red complex with PAN in the presence of I– or Br–, which is extractable into benzene from sulphuric acid media.