Showing papers in "Analytica Chimica Acta in 1962"

TL;DR: In this article, a single solution reagent was described for the determination of phosphorus in sea water, which consists of an acidified solution of ammonium molybdate containing ascorbic acid and a small amount of antimony.

TL;DR: In this paper, a rapid and accurate method for the determination of the total sulphur content of soil or plant material is described, where the sample is heated with sodium bicarbonate and silver oxide at 550° for 3h, and the sulphur contents of the whole residue is reduced to hydrogen sulphide and determined as methylene blue.

TL;DR: In this paper, the effects of hydrogen ion concentration, reduction temperature, reaction time and the order of reagent addition are discussed, and the nascent nitrite diazotizes with sulfanilamide and is then coupled by N-1-naphthylethylenediamine in acid medium forming a diazo-dye which is measured spectrophotometrically.

TL;DR: The visible spectra of the highly sensitive colorimetric reagent 4-(2-pyridylazo)-resorcinol (I), and of the coloured cpmplexes formed with copper(II), nickel, cobalt, lead, and uranium (VI) were obtained in water and in aqueous dioxan as mentioned in this paper.

TL;DR: In this article, the stability constants of 4-(2-pyridylazo)-resorcinol (I) with copper(II), cobalt-(II), zinc(Il), lead(ll), and uranium(VI) were determined by potentiometric titration in aqueous media.

TL;DR: In this article, a rapid photometric method with formaldoxime is described for the determination of small amounts of manganese in waters containing iron, which is decomposed by addition of EDTA and hydroxylamine after development of the manganESE-formaldoximes color.

TL;DR: In this article, a new apparatus is described which permits the simultaneous recording of the differential thermal analysis and gas evolution curves for a given sample from ambient to 900°, where the sample is pyrolyzed in a dynamic helium gas atmosphere using a conventional DTA furnace and sample holder assembly.

TL;DR: In this article, the methode decrite permet d'effectuer le dosage du fer, de luranium ou du plutonium en milieu nitrique par volumetric.

TL;DR: In this paper, a photometric dithizone procedure was used for quantitative separation of microgram quantities of mercury (II) from sulfuric and nitric acid solutions over wide ranges of concentrations, and was applicable for 0.10 μg per sample charge with a standard deviation for a single determination of 0.05 μg in the o to 0.5 μg range.

TL;DR: In this paper, the alkylindoles, -carbazoles and -phenazines were extracted from a petroleum distillate by adsorption on activated aluminum oxide and desorption with methanol.

TL;DR: In this article, a method for the determination of carbonyl groups in cellulose based on the reaction with hydrazine is suggested. But the method is not suitable for the detection of carboxyl groups.

TL;DR: In this paper, a mixture of ferric chloride and zinc chloride was used to remove nitrogen compounds from a hydrogenated furnace oil and the resulting complexes were separated from the oil and thermally decomposed to liberate the nitrogen compounds.

TL;DR: In this article, the authors derived a mathematical expression relating the temperature at a given stage of the reaction to the rate of decomposition, fraction of reactant left, initial weight and area of the compound.

TL;DR: In this paper, coordination polymers of 8,8'-dihydroxy-5,5'-biquinolyl(I) with Cu(II), Zn, Cd, Ni, Co, and Mn(II) were prepared and studied.

TL;DR: In this paper, general equations for computation of the step formation constants of complexes through determination of the degree of formation of the system and measurement of the free ligand concentration are derived, and methods of graphical solution and of solution by successive substitution are demonstrated.

TL;DR: In this article, it was shown that the proportion of this degradation is constant over a wide range of conditions and the method is capable of being used for the quantitative determination of simple aliphatic alcohols and aldehydes.

TL;DR: In this article, four features of atomic absorption have been studied, including spectral slit width, electrical discharge, flame adapter, and double-wavelength system, and electrical discharge can be used for sample atomization.

TL;DR: In this paper, a micro-coulometric determination of several elements using the Reilley and Porterfield method of generating EDTA by electrolysis of its mercuric chelate is described.

TL;DR: In this article, the effects of various experimental variables on the characteristics of the wave are described, and an equation is advanced for its rate-determining step, and the mechanism of this process is discussed on the basis of coulometric evidence.

TL;DR: In this paper, the authors determined sulphur and phosphorus in steel were determined by neutron activation analysis, being counted as 35 S and 32 P respectively, making use of a double irradiation technique at different fast to slow neutron fluxes.

TL;DR: In this article, a new procedure for the determination of molybdenum and tungsten in niobium has been developed, which involves the formation of the intensely colored complex of MDE with toluene-3,4-dithiol in an aqueous medium and its extraction into carbon tetrachloride followed by the reduction of Tungsten and the formation and extraction of its complex.

TL;DR: In this article, the adsorption of a number of metals on Dowcx-I from potassium thiocyanate solutions has been studied and the distribution coefficients were measured as a function of thiocyclate concentration for zinc, cobalt, cadmium, scandium, and silver.

TL;DR: In this article, a rapid determination of carbon and hydrogen in organic fluorine compounds is described, where magnesium oxide is used both as an absorbent for fluorine and as an aid to complete combustion.

TL;DR: In this paper, a very sensitive method for non-aqueous colorimetry of zirconium is described, where tri-n-octylamine solutions obtained by liquid-liquid extraction of Zr from the initial 11 N HCl solution are used with xylenol orange as reagent.

TL;DR: In this article, the determination of carbon and hydrogen in organometallic compounds is described, and Cobalto-cobaltic oxide is used as the catalytic tube filling in a rapid procedure.

TL;DR: Iodide ions react with thallic ions at pH 2-8 to form a complex iodide, which is suitable for the spectrophotometric determination of thallium as discussed by the authors.

TL;DR: In this paper, the rapid extraction and simultaneous spectrophotometric determination of mg amounts of cobalt(II) by means of 2-thenoyltrifluoroacetone is described.

TL;DR: In this paper, a new cell assembly for use with the differential cathode ray polarograph is described with full practical details of its use in comparative polaragraphy, and it is shown that the coefficient of variation of a polarographic determination can be as low as 0.04%.

TL;DR: The combined use of cation exchange enrichment and spectrochemical analysis for the determination of rare earths in common silicate rocks is described in this paper, where the rare earth elements are more strongly adsorbed by Cation exchange resins than the abundant elements, hence the latter can be eluted with a concentration of acid which does not desorb the rare elements.