Showing papers in "Talanta in 1982"

TL;DR: The importance of speciation measurements and the various factors leading to changes in speciation are discussed in this review.

TL;DR: This article reviews the different methods used for the determination of selenium species in all types of environmental waters and basic difficulties are discussed and the efficiency of the methods is explained in view of the sub-mug/1.

TL;DR: The cyclic tetra-aza complexones cDOTA, cTRITA and cTETA have been synthesized and characterized by elemental analysis, titration, melting-point determination and NMR (and infrared) spectroscopy and neither this ligand nor the other two offer advantages over EDTA or DCTA for the complexometric titration of transition metals.

TL;DR: TITFIT, a computer program written in HP-enhanced BASIC is able to fit potentiometric titration curves with up to 400 points by using the Newton-Gauss-Marquardt technique supplemented by the use of analytical derivatives.

TL;DR: Applications of hydrazones in inorganic analysis since 1950 are reviewed and several new ideas are proposed for further investigation.

TL;DR: The computer program, MAGEC, described can optimize simultaneously any or all of the titration parameters pertinent to the calibration of glass electrodes, including the protonation constants of a ligand and the glass-electrode parameters, from a given single set of titration data.

TL;DR: The cation-chelation mechanism may be widely applicable to the sorption of ions of several types by polyether-based polyurethanes, particularly when large, hydrophobic anions are accompanied by an excess of chelatable cations.

TL;DR: A method has been developed for the direct estimation of potential errors that shows that extraneous additions occurring during sample collection and preparation may give rise to grossly misleading results on subsequent analysis.

TL;DR: A reversed-phase liquid chromatographic technique based on a combination of multielement chelation by 8-hydroxyquinoline with subsequent adsorption on C(18)-bonded silica gel for concentration of Cd, Zn, Cu, Ni, Co, Mn and Fe from sea-water is described.

TL;DR: A systematic investigation has been made of various methods for decomposition of blood and plasma for determination of selenium, and various sources of error have been identified.

TL;DR: More than 10 years of practical experience in the production of reagent acids is reviewed and a description of a new laboratory especially designed to permit trouble-free operation as well as ensure the continued high quality of the reagents produced.

TL;DR: This paper describes precautions aimed at reducing the magnitude of blanks during sampling, sample pretreatment and voltammetric determination of tracemetals, including cadmium, lead, copper, mercury, nickel and cobalt.

TL;DR: Modified versions of the complexation reactions of PEO with molybdophosphoric acid and with tetraiodobismuthate give results that are independent of molecular-weight effects for the range ca.

TL;DR: The presence of cationic, anionic, and neutral surfactants and humic substances is shown to affect the peak heights of copper, lead and cadmium in synthetic sea-water analysed by differential pulse anodic-stripping voltammetry, and adsorption and complex formation may account for the observed dependences.

TL;DR: The fluorescence intensities of terbium, europium and samarium complexes with several beta-diketone derivatives in the absence and presence of tri-n-octylphosphine oxide (TOPO) in micellar solution of nona-oxyethylene dodecyl ether (BL-9EX) were examined.

TL;DR: Analytical procedures for fractionating the total metal content of soils into subgroups have been assessed against the observed extraction behaviour, which indicates that most of the adsorbed metal ion is exchangeable.

TL;DR: The recommended method has been applied satisfactorily to the determination of antimony (III) and antimony(V) in various types of water at sub-ng/ml levels.

TL;DR: The solvent extraction of non-ionic surfactants with potassium chloride and tetrabromophenolphthalein ethyl ester potassium salt has been studied, and a method developed for determining trace amounts of Non-ionic Surfactants in water spectrophotometrically.

TL;DR: The need for environmental specimen collection and storage ("specimen banking") and the results of the first analytical series and of particular stability studies as a part of long-term investigations are demonstrated.

TL;DR: The stability constants of the MX(+) complexes were determined by potentiometry with fluoride and chloride ion-selective electrodes and the appropriate thermodynamic functions (DeltaH, DeltaS, and DeltaG) were calculated.

TL;DR: In dioxan-chloroform medium the acceptor chloranilic acid forms 1:1 molecular complexes with the alkaloids atropine, pilocarpine and strychnine, with maximum absorption at 535, 527.5 and 535 nm respectively.

TL;DR: Addition of nitric and perchloric acids with gradual heating up to 210 degrees seemed to be the best method: at this temperature the labelled selenium was still recovered quantitatively, and the destruction was fast and efficient.

TL;DR: Variability in the composition and quality of materials as well as of the relevant analytical data makes the treatment of the subject only semi-quantitative but the evidence suggests that control over contamination primarily depends on good laboratory practice.

TL;DR: A final evaluation of several different lots of one type of filter paper for room-temperature phosphorescence in terms of reducing the background phosphorescence of the cellulose and evaluating possible trace contaminants in cotton fibres is presented.

TL;DR: A new chelate-forming resin bearing mercapto and azo groups was prepared from a common anion-exchange resin by treatment with azothiopyrine disulphonic acid (ATPS), which was very stable and highly effective for the collection of mercury(II) by the batch and column methods.

TL;DR: A highly sensitive method for spectrophotometric determination of uranium has been devised, based on formation of a red-violet 1:2 (metal:ligand) complex from the reaction of uranium(VI) with 2-dibromo-2-pyridylazo)-5-diethylaminophenol in the presence of an anionic surfactant, sodium lauryl sulphate.

TL;DR: The problem of background measurement in Zeeman atomic-absorption spectrometry is discussed, which may be more or less faulty if the background is caused by line-rich electron excitation spectra of molecules.

TL;DR: A comprehensive review is given of how neutron-activation analysis for trace elements in biological matrices can be jeopardized by radiation damage, by the impurities present in the packing material or by nuclear interferences of major elements.

TL;DR: A new technique for automated homogeneous immunoassay has been developed and applied to the determination of serum IgG, and an enzyme label, horseradish peroxidase, conjugated to the antibody (anti-human IgG) was inhibited on immunochemical association.

TL;DR: Methods for the separation and determination of trace elements by volatilization and by gas chromatography are reviewed and examples of typical separations and apparatus suitable for inorganic gas Chromatography is described.