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Showing papers in "Analytica Chimica Acta in 1970"


Journal ArticleDOI
TL;DR: In this paper, the authors describe procedures for various instrumental methods of analysis using lithium metaborate, including X-ray spectrography and atomic absorption and emission spectrometry.

231 citations



Journal ArticleDOI
TL;DR: In this article, a technique has been developed for the rapid analysis of samples injected into a streaming supporting electrolyte in small volumes, where the peak area of the voltammetric signal is proportional to the amount of electroactive material injected.

104 citations


Journal ArticleDOI
TL;DR: In this article, the partition of zirconium (IV) between hydrochloric acid solutions and organic solutions of a quaternary ammonium compound was investigated under different conditions.

72 citations


Journal ArticleDOI
TL;DR: A specific electrode is described for the direct assay of urea in blood and urine by immobilizing a layer of urease in polyacrylamide over the surface of a Beckman cation electrode and is used in an ion-exchange system with an uncoated cation electrodes as reference.

52 citations


Journal ArticleDOI
TL;DR: Indium, cadmium, yttrium and the 14 rare earth elements were simultaneously separated in the U.S. Geological Survey standard rocks, BCR-1 (basalt), G-2 (granite), and DTS-1(dunite) and determined by γ-spectrometry with a 3×3 in NaI(Tl) well crystal and associated electronics as discussed by the authors.

52 citations


Journal ArticleDOI
TL;DR: In this article, the adsorption of the depolarizer leads to an increase in the sensitivity of the analytical determination with different methods to different extents ; the highest increase, almost 100-fold, was found with the controlled current methods.

51 citations


Journal ArticleDOI
TL;DR: A method for the determination of manganese by X-ray fluorescence is described in this article, using scattered X-rays as an internal standard, a linear calibration plot is obtained for standard rocks that agrees with the chemical data.

49 citations


Journal ArticleDOI
TL;DR: In this paper, an apparatus for desalting sea water by electrodialysis with ion exchange membranes is described, and the desalted samples are evaporated in vacua and investigated by liquid-liquid and gas-liquid Chromatographic methods.

48 citations


Journal ArticleDOI
TL;DR: In this paper, a methode de dosage potentiometrique des ions dodecyl-trimethyl-ammonium, tetradecyl trimethyl ammonium, hexadecyl trimethyl ammonium and tetrabutyl ammonium in solution aqueuse is decrit.

48 citations


Journal ArticleDOI
TL;DR: In this paper, the construction and operation of a shielded hollow-cathode tube for emission spectrometric trace element analysis of solution is described, and the demountable tube design also permits the tube to be used as a versatile line source in atomic absorption spectrometry.

Journal ArticleDOI
TL;DR: In this paper, the design and operation of an improved carbon-filament atom reservoir is described and the optimum conditions for determination by atomic fluorescence of a number of metals are described and limits of detection are reported.

Journal ArticleDOI
TL;DR: In this paper, a modified filament atom reservoir cell is described which permits atomic fluorescence measurements to be made without surrounding the electrically heated graphite element with a glass dome, and the fluorescence behaviour of cadmium in this atom reservoir is described.

Journal ArticleDOI
TL;DR: In this article, the direct and indirect determination of cyanides can be carried out with a silver iodide-based ion-selective electrode, which measures only cyanide ions and does not respond to hydrocyanic acid.

Journal ArticleDOI
TL;DR: In this paper, an aqueous solution of 2-aminoperimidine hydrochloride is proposed as a new reagent for the detection and determination of the sulphate ion.

Journal ArticleDOI
TL;DR: In this paper, the spectra of hydrocarbons introduced into a plasma torch have been studied and the background of the plasma torch is much simpler than that of a flame and higher temperatures are obtained.

Journal ArticleDOI
TL;DR: The thermal properties of divalent metal complexes of 2-, 3-, and 4-pyridinecarboxylic acids were determined by TGA, DTA, DSC, high temperature reflectance spectroscopy, and dynamic reflectance spectrum analysis.

Journal ArticleDOI
TL;DR: In this paper, the dependence of the composition of zinc hexacyanoferrate(II) complexes on the mixing ratio of zinc nitrate solutions is demonstrated, and the ion-exchange behavior of the different complexes is described.

Journal ArticleDOI
TL;DR: In this paper, a sulfide-selective heterogeneous membrane electrode has been developed by thermomoulding a mixture of silver sulfide and a thermoplastic polymer such as polythene.

Journal ArticleDOI
Taichi Sato1
TL;DR: In this paper, the partition of zirconium(IV) between hydrochloric acid solutions and solutions of tri- n -butyl phosphate (TBP) and of di-(2-ethylhexyl)-phosphoric acid (DEHPA) in kerosene has been investigated under different conditions.

Journal ArticleDOI
TL;DR: In this paper, the stability constants for triethylenetetraminehexaacetic acid (TTHA) complexes were evaluated from data obtained by pH and pM measurements.


Journal ArticleDOI
TL;DR: In this article, a series of ion-selective electrodes based on metal dithizonates is discussed and a theory to explain their behavior is proposed, where the higher the extraction constant of the metal Dithizonate, the greater is the selectivity of the electrode prepared from it for the particular metal involved in the extraction system.

Journal ArticleDOI
TL;DR: In this paper, the electronic spectra produced by various organic compounds when introduced into the plasma, have been studied and it was shown that the tendency is for the molecules to be shattered in the plasma and to emit electronic spectrum typical of functional groups.


Journal ArticleDOI
TL;DR: In this article, a new type of copper(II)-selective electrode was developed, based on copper(I) sulfide ceramic membranes prepared by an annealing process, and the response time was very short even at low concentrations and the potentials were steady and reproducible.

Journal ArticleDOI
TL;DR: In this paper, a dual-element arsenic-antimony microwaveexcited electrodeless discharge tube is described; it can be applied to atomic fluorescence and atomic absorption spectroscopy.

Journal ArticleDOI
TL;DR: A method has been developed for the coulometric titration of these substances with electrogenerated cerium (IV) and quantities of 0.25–20 mg are determinable with an average error of less than ± 1 rel.

Journal ArticleDOI
TL;DR: In this article, it was shown that reduction waves corresponding to formation of mercury compounds are formed by the unprotonated species Reduction waves of compound 1, and uv absorption bands and anodic waves of compounds I-IV are suitable for analytical purposes.

Journal ArticleDOI
TL;DR: In this paper, it was shown that formate, acetate, propionate and n-butyrate buffers interfere with the precipitation reaction and the carboxylates cause the lanthanum fluoride membrane electrode to work sluggishly after the titration.