Showing papers in "Talanta in 1964"

TL;DR: In this paper, a procedure has been developed which enables uranium to be determined without chemical separation in solutions containing iron, plutonium, nitrate and many other foreign ions, which interfere in conventional redox methods.

TL;DR: In this paper, the authors investigated derivatically ammonium salts and measured the enthalpy change of the salts as a function of temperature, and derived the temperatures at which the salts may be dried without decomposition.

TL;DR: The particular analytical utility of arsenazo III is its capacity for forming especially stable complexes with certain elements as mentioned in this paper, which permits determinations to be carried out in strongly acid media (for quinquevalent and quadrivalent elements up to 10M HCl or H2SO4), which ensures good reproducibility, ease of working, and little interference by anions.

TL;DR: In this paper, the properties and behaviour of the chelating ion exchanger Dowex A-1 have been studied when in contact with an aqueous solution containing metal ions complexed with arninocarboxylic ligands.

TL;DR: In this paper, a chemical procedure for determining the distributions of uranium, neptunium and plutonium among their respective oxidation states in various aqueous media at tracer concentrations is described.

TL;DR: In this paper, it was shown that the degree of complexation increases with increasing strength of the base and increasing number of hydrogen atoms in the ammonium group of the conjugate acid, and also that it has severe steric requirements.

TL;DR: In this article, a new analytical tool is introduced for the analysis of fluorescent molecules, called quenchofluorescence analysis, which is used for organic trace analysis, and it is shown that the quenching effect in spectrophotofluorometry can be used to characterize fluoranthenic rings.

TL;DR: The two functional analytical groups of the molecule of arsenazo III are present in two almost isolated conjugated systems as discussed by the authors, which leads to the appearance of two absorption bands in the visible region of the spectrum.

TL;DR: In this article, the effects of sample size, heating rate, atmosphere and container geometry are presented in a series of paired thermograms, and the differences are accounted for with the aid of additional evidence from differential thermal analysis and from combustion train experiments.

TL;DR: In this article, a Konig-type reaction was used for the determination of trace amounts of cyanide in waters over a range of 0.005-100 ppm with slight variation in procedure.

TL;DR: In this article, the effects of extraneous ions, solvents and flame height on the determination of lead by atomic absorption spectroscopy at 2833 A have been examined in order to obtain satisfactory results for lead in gasoline, the standard solutions used in the preparation of the calibration curve must also be prepared from tetra-ethyl lead and the absorbance should be measured near the base of the airpropane flame.

TL;DR: Bromopyrogallol red (BPR) and 1,10-phenanthroline (phen) were used as a reagent system for the spectrophotometric determination of silver ions in aqueous solution in the range 002-020 ppm.

TL;DR: In this article, the trifluoracetyl-aeetonates (TFA's) of aluminium, gallium, indium, beryllium, and thallium have been studied and conditions for their complete separation found.

TL;DR: The Konig synthesis of pyridine dyestuffs by reaction of cyanogen bromide and suitable aromatic amines with Pyridine, used as the basis of standard British and American colorimetric methods for the determination of small amounts of cyanide, is reinvestigated after consideration of the carcinogenic properties of amines capable of being used in a method for cyanide.

TL;DR: In this article, the anion exchange behavior of uranium, thorium, the rare earths and several other elements representing the various groups of the Periodic Table, has been investigated in 12 organic solvents containing hydrochloric acid as the cornplexing agent.

TL;DR: In this paper, the distribution of chelate complexes of these metal ions between 0.1 M sodium perchlorate and chloroform or methylisobutylketone with nineteen chelating acids has been determined.

TL;DR: In this article, an anion exchange method for the separation of scandium, yttrium, samarium and lanthanum in good radiochemical purity has been developed based on the chromatographic elution of these elements from a Dowex 1 × 8 (nitrate form) resin column using methanol-nitric acid mixtures.

TL;DR: In this article, the 1-Isonicotinoyl-2-salicylidenehydrazine (1-IISI-2) was examined for chelatometric properties with a number of cations.

TL;DR: In this article, the anion exchange behavior of hexavalent uranium and of other elements in organic solvents containing organic acids is described, including formic, acetic and propionic acid, and also chloro-derivatives of acetic acid.

TL;DR: In this article, a highly selective colorimetric method for vanadium V, based on its colour reaction with Xylenol Orange, is described, in the presence of 1,2-diaminocyclohexanetetra-acetic acid (DCTA).

TL;DR: In this paper, a method for the separation of scandium from rare earths and thorium by anion exchange was described, which utilises the adsorption of a negatively-charged thiocyanato complex of sccandium on the strongly-basic anion exchanger Dowex 1-X8 from a 2 M solution of ammonium thIocyanate in 0·5 M hydrochloric acid.

TL;DR: In this paper, the possibilities of substoichiometric determination of traces of metals by activation analysis and isotope-dilution analysis are critically discussed and optimum conditions given for the determination of 24 metals.

TL;DR: In this paper, the rock powder is sintered with a sodium carbonate flux containing zinc oxide and magnesium carbonate, the sinter-cake leached with water and the resulting solution filtered.

TL;DR: In this article, it was shown that the linear phosphates above the tetramer are eluted in the sequence of their increasing degree of polymerisation, leading to the common assumption that the cyclic polymers are probably pentametaphosphate.

TL;DR: In this paper, it was shown that the kinetic parameters of simple, fast electrode reactions of the type O + ne = R, where R is soluble in the solution or in the mercury electrode, can be determined by the potentiostatic method with a solution initially containing only the substance O, the substance R being generated in situ during electrolysis, provided that the electrode reaction involves only a single rate-determining step.

TL;DR: In this article, the authors proposed a radiochemical procedure based on the solvent extraction of arsenicIII diethylammonium diethyldithiocarbamate into chloroform from 2-3M hydrochloric acid, and eliminated the necessity of determining the chemical yield.

TL;DR: In this paper, a method of analysis of hydrogen peroxide in concentrations of about 10−1M, applicable to solutions which are stable towards alkaline hexacyanoferrate(III) and hexacyansiferrate(II), is suggested.

TL;DR: In this paper, an atomic absorption spectroscopy in an air/propane flame at 3281 A.m. was used to determine the concentration of silver in aqueous solution in the range 1-10 ppm.

TL;DR: In this article, a method for the anion-exehange separation of small quantities of beryllium, vanadium, magnesium, calcium, aluminium, gallium and indium from gram-amounts of uranium is described.