Showing papers in "Talanta in 1969"

TL;DR: The rates of adsorption of several metal ions on chitin and chitosan in water and sea-water have been measured and these natural polymers are proposed as Chromatographic chelating supports for recovery of trace metals from sea- water.

TL;DR: In order validly to correlate quantum mechanically calculated data for the energy required to add or remove an electron to or from the outermost electron level of each molecule, with electrochemical redox potentials (in solution), the effects of adsorption, electron-transfer reversibility and solvation energy must be considered.

TL;DR: A new method based on complete ignition of the sample in a silica tube, trapping volatile interfering activities such as bromine or chlorine, and selectively adsorbing mercury on a strip of filter paper which has been previously impregnated with elemental selenium is devised.

TL;DR: The influence of the substituent on the nitrogen atom with respect to the rate and pattern of decomposition of N,N-disubstituted dithiocarbamie acids has been studied and a mechanism to accommodate the observed results has been proposed.

TL;DR: The polarographic behaviour of arsenic in various media is reviewed with particular emphasis on the mechanisms of the electrode reactions and on the use of polarographic methods for the determination of the element.

TL;DR: Phenomena such as solvent, pH, and photochemical effects are shown to play an important role in the fluorimetric analysis of air pollutants, and fluorescence assay methods are discussed in terms of selectivity, sensitivity, speed, simplicity, accuracy, precision, interferences, and the relation between concentration andfluorescence intensity.

TL;DR: The defects of cupferron and versatility of N-benzoyl-N-phenylhydroxylamine in reaction with various metal ions is discussed and suggestions for further use of this compound and other hydroxylamines are given.

TL;DR: Substantial amounts of Ag, Al, Au, Bi, Ca, Co, Cr, Fe, Hg, K, La, Mg, Mn, Mo, Na, Ni, Pb, Te, Ti, V, Y, Zn, and the platinum metals do not interfere in the atomic-absorption determination.

TL;DR: Both potentiometric and spectrophotometric methods have been used for the determination of the stability constants of hydrogen complexes of 4,5-dihydroxynaphthalene-2,7-disulphonic acid.

TL;DR: Solvent-uptake properties for several synthetic resins and common adsorbents were determined by the centrifugation method and the swelling properties of these non-polar resins are compared with each other and with the polar cation resins.

TL;DR: The interconal zone of the hot, slightly fuel-rich flame exhibits low background and noise levels and an extended reducing atmosphere, providing better conditions for the excitation of atoms of elements which form refractory oxides.

TL;DR: In this paper, the katalytische Aktivitat des Jods in salpetersauren Reaktionsgemischen auf das 20-fache gegenuber jener in den herkommlichen schwefelsauren Medien is analyzed.

TL;DR: In this article, a PAN-Losung bei pH 10 gefallt is described, and mesempfindlichkeit, richtigkeit und Reproduzierbarkeit der Messungen, sowie die Erfassungsgrenzen angegeben.

TL;DR: This review deals with applications of digital computers to the evaluation of ionization constants of acids and bases, stability constants of metal complexes, concentrations of equilibrium mixtures, and the solution of rate equations.

TL;DR: A low-melting solid is used as organic solvent for liquid-liquid extraction at elevated temperatures followed by solidification and decantation of the aqueous phase.

TL;DR: It is concluded that the most sensitive and specific wavelengths for analytical purposes are not necessarily the same for all the sulphur compounds examined, viz. carbon disulphide, thiophen, thioglycollic acid, dimethylsulphoxide and sulphur dioxide.

TL;DR: A detailed study of the gas chromatography of the aluminium(III), chromium(III) and iron( III) beta-diketonates has shown that their elution and separation characteristics arise from a number of adsorptive effects.

TL;DR: The reaction between slightly aged solutions of zirconyl chloride and Xylenol Orange is catalysed by the presence of substoi-chiometric amounts of fluoride, phosphate, arsenate, sulphate, citrate or oxalate and provides a method for determining fluoride in amounts from 0.5 to 5 mug in a final volume of 100 ml.

TL;DR: The reaction of palladium with copper diethyldithio-carbamate has been studied and two complexes isolated: palladium diethyllithiocarbamate and palladium chloride diethyldergetic chloride.

TL;DR: Results for international biological standards agreed well with values obtained by activation analysis: kale 0.159 ppm Hg (relative standard deviation 2%) and IAEA cereals 0.0435 ppm HG (+/- 5%).

TL;DR: Kinetic and equilibrium considerations of catalytic titrants and catalytic end-point detection are presented and discussed and applications of the approach to the determination of major and trace components of organic and inorganic species are included and discussed.

TL;DR: Atomic-fluorescence measurements, with microwave-excited electrodeless discharge tubes as sources of excitation, are described and comparisons are made with a thallium hollow cathode lamp andThallium and mercury spectral discharge lamps.

TL;DR: An electrical detection system has been developed which can be used with the high-frequency spark-source mass spectrograph and can also be used to assess sample inhomogeneities.

TL;DR: A rapid non-destructive neutron-activation method for the determination of uranium in rocks based on activation with epithermal neutrons and subsequent measurement of the 74 keV gamma-ray of (239)U is described.

TL;DR: A kinetic method was described for the determination of molybdenum by its catalytic effect on the peroxide-iodide reaction, and the element was determined in the range 0.5-11 mug in 50 ml.

TL;DR: Reactions and the analytical applications of tetraphenyl-phosphonium, -arsonium and -stibonium," as well as halo- and thiocyanato-anionic complexes are surveyed.

TL;DR: The high-precision coulometric titration apparatus of Eckfeldt and Shaffer has been used for the precision assay of two primary standard materials for oxidation-reduction work and the purity found for NBS 136b Potassium Dichromate is higher than expected.

TL;DR: A spectrophotometric method is described for the determination of 2-80 mug of ruthenium and about 98 % of (106)Ru tracer was recovered.

TL;DR: A catalytic method has been developed for the determination of silver(I), with a sensitivity of 4 x 10(-4)mug ml and +/-7.6% relative error.

TL;DR: The review is a continuation of the initial reviews and covers the period of abstracting up to and including April, 1967 and work on the atomic-absorption determination of noble metals is also included.