Showing papers in "Analytica Chimica Acta in 1992"

TL;DR: In this paper, the effect of macro levels of selected elements on the sorption of actinide ions by a novel extraction chromatographic resin comprised of a solution of octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide in tri-n-butyl phosphate supported on an inert polymeric substrate is described.

TL;DR: Whitehead and Thorpe as discussed by the authors used an enhanced chemiluminescent reaction involving horseradish peroxidase and luminol for the detection of antioxidants and measurements of antioxidants capacity.

TL;DR: In this article, the principles of optodes, which are based on a reversible mass transfer of analyte from the sample into the bulk of the sensing layer, have been elucidated in detail.

TL;DR: In this article, the suitability of a recently published extraction chromatographic method to isolate from geological samples for isotopic analyses by thermal ionization mass spectrometry was evaluated, which has several significant advantages over conventional ion exchange techniques.

TL;DR: In this article, the authors describe solution-phase chemiluminescent reactions of analytical interest and their attractions include high sensitivity, wide dynamic range and the use of simple instrumentation for monitoring emission.

TL;DR: Gel permeation chromatography (GPC) was used to probe the fractionation of humic substances on dissolution in several media (KNO 3, Na 4 P 2 O 7, and synthetic sea water) as a function of pH and ionic strength as mentioned in this paper.

TL;DR: Ink-jet printing has been demonstrated as a manufacturing technique that facilitates the rapid, reproducible and economical production of amperometric glucose biosensors as discussed by the authors, and Glucose was chosen as the...

TL;DR: In this article, a linear relationship between the detection windows of the analytical techniques and the detected metal complexation was found, whereas the conditional stability constant was found to increase with increasing magnitude of the detection window.

TL;DR: A voltammetric procedure to determine chromium in aqueous solution using cathodic stripping voltammetry (CSV) preceded by adsorptive collection of complex species with diethylenetriaminepentaacetic acid (DTPA) on a hanging mercury drop electrode is optimized for sea water.

TL;DR: In this article, the authors used Electrochemiluminescence (ECL) to detect hydrogen peroxide in aqueous solutions in the presence of electrolytically oxidized luminol.

TL;DR: An amperometric biosensor for the detection of organophosphate and carbamate pesticides was constructed as a disposable strip containing a cobalt phthalocyanine-modified carbon composite electrode and a cross-linked cholinesterase layer and the ratio (dI/dt)/Iss was used for evaluations.

TL;DR: An efficient data reduction procedure based on the Kendrick mass scale has been developed for on-line liquid chromatography-high resolution mass spectral (LC-HRMS) data analysis of hydrocarbon mixtures as mentioned in this paper.

TL;DR: In this paper, a system for on-line treatment of liquid samples in a microwave oven and determination of mercury by cold-vapour atomic absorption spectrometry was designed and evaluated.

TL;DR: In this article, the complexation ability of coumarin 153 linked to monoaza-15-crown-5 was studied and the stability of the complexes remains high enough in acetonitrile-water mixtures for practical application to the determination of cation concentrations in aqueous samples.

TL;DR: In this paper, a method for simultaneous determination of butyl and phenyltin compounds in the aquatic environment was studied, where analytes in water, sediment and biological samples were extracted into 0.1% tropolone-benzene solution after adding hydrochloric acid diluted with tetrahydrofuran.

TL;DR: In this article, a fully automated column liquid chromatographic separation system using on-line trace enrichment, gradient elution and diode-array detection for the trace-level determination of polar pollutants is described.

TL;DR: Evolving factor analysis (EFA) is a promixing method for the analysis of multivariate data with an intrinsic order as mentioned in this paper, and it has been applied for peak purity control in liquid chromatography with photodiode-array detection.

TL;DR: The state of the art of flow-injection technique is reviewed and its future development is outlined by emphasizing the importance of stopped-flow and sequential injection methodologies and by discussing common aspects of flow injection and chromatographic techniques.

TL;DR: In this article, a co-fluorescence enhancement system was developed for the detection of europium, terbium, samarium and dysporium ions in time-resolved fluorimetric immunoassays.

TL;DR: In this paper, a review of the optimization of peroxyoxalate (PO-CL) detection with emphasis on background chemiluminescence and kinetic aspects is presented.

TL;DR: In this paper, the target vector criterion was combined with a genetic algorithm as a parallel and evolutionary search technique in order to obtain a multicriteria optimization technique for the simulataneous optimization of six atomic emission lines of trace elements in alumina powder as a function of spectroscopic excitation conditions.

TL;DR: In this article, a derivatisation with 1,2-diamino-4,5-dimethoxybenzene dihydrochloride was described for the analysis of trace amounts of 2-oxopropanal.

TL;DR: The optimization results show that for both short and long runs the dynamic genetic algorithm is superior to the “classical” genetic algorithms and that after optimization not only can the data sets be compacted and refined but also the predictive ability of the calibration model can be improved.

TL;DR: In this article, the effects of the immobilization procedures and the matrix materials on the degree of luminescence oxygen quenching of a strongly luminescent platinum complex embedded in various solid films was tested for its characteristics in optical oxygen sensing in the gaseous state.

TL;DR: In this article, a time-resolved electroluminometer, which utilizes electrogenerated luminescence (EL) from disposable oxide-covered aluminium electrodes, is described in detail.

TL;DR: In this paper, the effect of various experimental parameters on the selectivity of the reduction of the adsorbed complex was explored, and the results showed that the reduction improved selectivity over previously reported adsorptive stripping schemes, while offering similar subnanomolar detection limits.

TL;DR: In this paper, the application of the wavelet transform in the determination of peak intensities in flow-injection analysis was studied with regard to its properties of minimizing the effects of noise and baseline drift.

TL;DR: In this paper, the electrochemical behavior of elemental sulphur, sulphide and their mixtures on a mercury electrode in 0.5 mol dm−3 NaCl-NaOH supporting electrolyte at pH 10 with and without the addition of 10% (v/v) methanol and 1 × 10−5 mol Dm−4 toluene was studied.