Showing papers in "Talanta in 1980"

TL;DR: Determination of Cd, Zn, Pb, Cu, Fe, Mn, Co, Cr and Ni in coastal sea-water by graphite-furnace atomic-absorption spectrometry after preconcentration by solvent extraction and use of a chelating ion-exchange resin is described.

TL;DR: A review of the theory, applications, and advantages and disadvantages of the major types of electrochemical detectors in flowing systems is presented in this report.

TL;DR: The three solid forms of fluorescein, yellow, red and (newly isolated) colourless, have been shown to differ distinctly in structure.

TL;DR: Lead, the alkali metals, Be, Sr, Ba, Ra, Sc, Y and the lanthanides, Ti(IV), Zr, Hf, Th and Cr(III) have not been investigated in detail but should be separated according to their known distribution coefficients.

TL;DR: Addition of stannous chloride as labilizing agent makes possible a group separation of platinum metals (except osmium) in 1,2-dichloroethane from hydrochloric acid medium.

TL;DR: Direct potentiometric and visual end-point titrations and back-titration procedures have been developed for the determination of typical reductants.

TL;DR: A non-linear least-squares program based on Marquardt's modification of the Newton-Gauss method is discussed and its performance in the calculation of equilibrium constants is exemplified.

TL;DR: A method has been developed for determining traces of Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in rocks by electrothermal atomization in a pyrolytically-coated graphite furnace and the results are in good agreement with literature values.

TL;DR: The separation of chromium by solvent extraction is reviewed and chromium concentrations in Na6SO4, Na2CO3, and Na2SO4 are determined using a solvent-free method.

TL;DR: In this article, a verfahren zur bestimmung von Kupfer, Kobalt and Nickel als Diathyldithiocarbamate aus wassriger Losung im unteren μg/l.-Bereich vorgestellt.

TL;DR: An automated solvent extraction method for determination of lead and cadmium down to the 50 ng/ml level has been developed and designed and verified by using the flow-injection scanning method.

TL;DR: In this article, Austauscher mit cyclischen polyethern als Ankergruppen werden hergestellt une auf ihre Eigenschaften untersucht.

TL;DR: Methods have been devised for the separation of gold from platinum and for its determination and also for the simultaneous determination of palladium and platinum.

TL;DR: The results reveal that only mononuclear (1:1) di-, mono- and un Protonated metal chelates are formed and that the general order of stability for the unprotonated complexes is Zn > Mn > Ca > Cu > Cd > Pd > Ni > Co reverse similar Sr > Mg > Ag > Ba.

TL;DR: Nanogram amounts of mercury(II) and methylmercury in artificial sea-water containing mineral acids as preserving reagents were shown to be collected quantitatively with activated carbon and Mercury concentrated on activated carbon was determined directly by combustion, trapping on gold and electrothermal atomic- absorption spectrophotometry.

TL;DR: The theoretically-based method used to express the complexation equilibria requires values for the concentrations of the several mobile counter-ions in the peat phase and permits estimation of the nature of the complexed species formed in thePeat, and results are independent of the ionic strength of the equilibrating solution.

TL;DR: The microionization constants and the tautomeric constants (concentration ratios of zwitterion to uncharged or neutral species) and the species distribution as a function of pH were calculated for the three kinds of sulphonamides.

TL;DR: It was found that the cis isomer possesses much higher extractive power than the trans isomer for the metal cations, which also reflects their complexing properties.

TL;DR: The highly coloured bis[2-(2-pyridylazo-5-diethylaminophenolato] cobalt(III) ion, Co(PADAP)(+)(2), is proposed as a new counter-ion for use in the extraction and spectrophotometric determination of traces of colourless anions in water and its application to the determination of sulphated and sulphonated surfactants is described.

TL;DR: The effect of the cationic surfactant 1-carbethoxypentadecyltrimethylammonium bromide at above and below its critical micelle concentration on the absorption spectra and the values of the apparent dissociation constant pK(2) of the dyes Phenol Red, Bromophenol Blue and Bromocresol Green has been studied.

TL;DR: The Austauscher mit cyclischen polyethern als Ankergruppen besitzen eine grose Anwendungsbreite as discussed by the authors, i.e. Kationentrennungen bei gleichen Anionen, Anionentrenungen wasi gleich Kationen, Trennngen nichtsalzartiger organischer Verbindungen, Wasserbestimmungen.

TL;DR: Two commercially available systems for the determination of selenium by hydride-generation and atomic-absorption spectrometry were compared and both systems evaluated with respect to performance and applicability to determination of traces of Selenium.

TL;DR: Conditions have been found which make possible the determination of thallium and/or lead in cadmium and its salts without preliminary separation.

TL;DR: From the precipitation borderline in the pM'-pH diagram, determined experimentally under CO(2)-free conditions, the stability constants of the mononuclear and polynuclear species of gadolinium hydroxide have been established.

TL;DR: The varied response of ASV peaks of Pb, Cu and Cd, which can follow changes in the base electrolyte composition, supports the need for careful control of the chemical environment in quantitative determination, and raises some queries about the feasibility of using direct ASV for speciation purposes.

TL;DR: Sulphide (0.1 ng/ml) is determined by measuring the chemiluminescence given by its oxidation in aqueous solution by hydrogen peroxide, catalysed by peroxidase.

TL;DR: Three macroreticular polystyrene-based resins with amino- or imino-thiazole and thiazoline groups as the functional groups have been prepared and have high selectivity for mercury(II) in acid and alkaline solutions.

TL;DR: The atomic-absorption sensitivity for selenium is found to be enhanced to a large extent by co-extraction of some transition metal ions.

TL;DR: A resin prepared from the sulphonic acid derivative of dithizone (DzS) was found to be superior to other chelate-forming resins and unstable when exposed to sodium chloride solution.