Showing papers in "Analytica Chimica Acta in 1971"

TL;DR: In this paper, a new reagent, 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, is described for the spectrophotometric determination of uranium(VI).

TL;DR: An iron (II) hydroxide coprecipitation method is used for the concentration of plutonium in sea water and a nitric-hydrochloric acid leaching method is adapted for the treatment of sediments and ashed organisms.

TL;DR: In this article, a new method has been worked out which allows the implementation of a special heating program according to which the temperature of the sample is rapidly increased so long as no changes occur in it, while it ensures nearly isothermal conditions when reactions connected with weight change are taking place.

TL;DR: In this article, the usefulness of a small low-energy photon Ge(Li) detector for instrumental neutron activation analysis of silicate rocks was investigated and a sample pelletizing technique was proposed to avoid systematic errors caused by self-absorption of low energy photons and by counting geometry.

TL;DR: A rapid and extremely sensitive method for the determination of mercury concentrations as low as 20 ng 1 −l in water is described and the recommended concentration of permanganate is shown to decompose methylmercury compounds completely.

TL;DR: In this paper, the ion-sensitive surface of the new solid-state electrode consists of a very thin layer of an electroactive material adsorbed on the surface of hydrophobized graphite.

TL;DR: Various parameters affecting the stability and sensitivity of the electrode are discussed as are the effect of pH, temperature, oxygen, enzyme and substrate on the response of the probe.

TL;DR: In the presence of fluoride complexing cations, the lanthanum fluoride electrode responds theoretically to free fluoride one to three decades below lO -6 M, the accepted limit in non-complexing solutions as discussed by the authors.

TL;DR: In this paper, a commercial high-frequency plasma generator and torch have been modified for application to the analysis of powdered samples, and the operating parameters have been investigated and the optimised system has been tested for analysis of beryllium and boron in magnesium oxide.

TL;DR: In this paper, an exponential equation has been derived to describe the response of the electrodes and the potential of the silver halide electrodes reaches a constant value within a few hundred milliseconds, from which they can be used advantageously as sensors in flowing and control systems.

TL;DR: A simple and rapid determination of guanine in the presence of guanosine has been developed ; a large amount of guano is added to the mixture, and the current for the guano voltammetric oxidation peak is measured as mentioned in this paper.

TL;DR: The p.m.r. spectra of 2,2,bipyridine, tris(2,2′-biprinearidine)ruthenium(II) dichloride, dichloro-bis(2.2′,2″-terpyridine)osmium (II), and bis(2.,2, 2.2″-, 2.3″)-terPyridine have been analyzed and the symmetry of the complex and geometry of the ligand within the complex are predicted as mentioned in this paper.

TL;DR: An enzyme electrode specific for glutamine is described that responds to glutamine over the concentration range l0-1–l0-4M with a response time of only 1–2 min.

TL;DR: 5-Aminoquinoline and 8-aminoquinoline fluoresce moderately to weakly in low dielectric media but not in strongly hydrogen-bonding or acidic aqueous media.

TL;DR: In this article, the authors decrit le principe des electrodes a membrane liquide epaisse specifiques des ions dodecyl-sulfate (DS − ), tetrapropylenebenzene-Sulfonate (TPBS − ) and dioctylsulfosuccinate (DOSS − ) which are peuvent andre utilisees for the determination de la concentration critique micellaire and pour le dosage potentiometrique des detergents anioniques dans l'eau pure and en presence d'un

TL;DR: A new rapid wet-ashing procedure for biological material is described, and Mercury is determined by the flameless cold-vapour, atomic absorption technique and complete release is shown to occur even when the fat present is not fully decomposed.

TL;DR: In this paper, the effects of 62 ions present in 1000-fold amounts on the determination of 10−9−l0−11g amounts of Ag, Bi, Cd, Cu, Hg, Mg, Pb, Tl and Zn by atomic fluorescence spectroscopy with a carbon filament in an argon atmosphere, with highintensity hollow-cathode lamps or electrodeless discharge lamps as sources of excitation.

TL;DR: Cobalt II and 4-[(5-chloro-2-pyridyl)azo]-1,3-diaminobenzene (5-Cl-PADAB) in slightly acid, neutral or alkaline medium form a pink-coloured complex as mentioned in this paper.

TL;DR: Chitosan solutions in formic and acetic acid were used to precipitate transition metal ions from nearly neutral solutions as discussed by the authors, and yields were generally high for Cd, Co, Ni, Pb, Zn, Ag and Hg.

TL;DR: The atomic absorption and fluorescence characteristics of gold generated in an argon atmosphere by a carbon filament atom reservoir and a high-intensity hollow-cathode lamp are examined in this paper.

TL;DR: In this paper, a non-flame cell utilising a microwave-induced argon plasma at atmospheric pressure is described for emission spectroscopie purposes, which operates at a microwave power of ca. 40 W (2450 MHz) and requires the use of only minute liquid samples.

TL;DR: Ion-selective solid-state electrodes were prepared from ion-radical salts of TCNQ as mentioned in this paper, and they were used as sensors in various applications, such as computer vision.

TL;DR: In this article, the atomic absorption behavior of iron in the carbon filament atom reservoir is described and the effect of the presence of 22 cations and anions in 10-1000-fold amounts is examined.

TL;DR: In this article, the extraction of a number of complex cyanides from aqueous solution by solutions of tetrahexylammonium erdmannate in hexone is reported.