Showing papers in "Talanta in 2004"

TL;DR: Increased utilization of mechanically stable synthetic matrices particularly silica gel as a solid support and its surface modification by impregnation of organic ligands directly or covalent grafting through spacer unit for extractive concentration of trace elements are highlighted in the present article.

TL;DR: A review of the use of the Doehlert matrix as a chemometric tool for the optimization of methods in analytical chemistry and other sciences is presented and 57 references concerning the application of DoehLert matrices in the optimized procedures involving spectroanalytical, electroanalytical and chromatographic techniques are considered.

TL;DR: The current report gives an overview of more than 100 papers, regarding existing methods for analysis of As (III) and As (V) in water, including various spectroscopic, ICP and electrochemical techniques.

TL;DR: Capillary zone electrophoresis (CZE) possessed the advantages of simplicity, rapidity, and good reproducibility; it can be developed for the separation of practical samples in environment analysis.

TL;DR: Multi-walled carbon nanotube was mixed with epoxy to fabricate microdisc electrode used as a detector for a specially designed miniaturized capillary electrophoresis (CE)-amperometric detection system for the separation and detection of several bioactive thiols.

TL;DR: A simple and rapid analytical method is presented in which the three veterinary antibiotics oxytetracycline (OTC), sulfachloropyridazine (SCP) and tylosin (TYL) are simultaneously extracted and determined in four different soils.

TL;DR: The accuracy of the developed solid phase extractive preconcentration method in conjunction with Arsenazo III procedure was tested by analyzing marine sediment and soil reference material and has been successfully employed for the analysis of soil and sediment samples.

TL;DR: The obtained recoveries for Cd, Cu, Cr, Co, Ni and Mn at the mugl(-1) level were satisfactory and practically independent of the matrix used for the calibration standards, while the recoveries of Pb and Zn were less sufficient.

TL;DR: The principles guiding PEBBLE design including synthesis, characterization, diversification, the advantages and limitations of the sensors, cellular applications and future directions ofPEBBLE research are discussed.

TL;DR: The above procedure has been successfully employed for analysis of uranium(VI) in soil and sediment samples and in conjunction with the Arsenazo III procedure was tested by analysing MESS-3, a marine sediment certified reference material.

TL;DR: It was found that Cr(VI) can undergo chemically irreversible reduction in acidic solutions at gold, glassy carbon and boron-doped diamond electrodes and was found to be diffusionally controlled at all three electrodes studied.

TL;DR: This paper summarizes the major assumptions of the phase-boundary potential model and discusses the usefulness and limits of this approach towards understanding sensor selectivity, upper and lower detection limits, the so-called sandwich membrane method to determine thermodynamic parameters, apparently non-Nernstian responses, potential drifts with solid contact electrodes, polyion sensors, and galvanostatically controlled ion sensors.

TL;DR: Electroanalytical aspects of electrochemical response of ascorbic acid (Vitamin C) at conducting and electrogenerated polymer modified electrodes, leading to permselective coatings and their diverse uses, especially for biosensing devices are considered.

TL;DR: The FTIR/PLS model was shown to be a fast and accurate method to predict reaction yields and to follow the in situ kinetics of soybean oil ethanolysis.

TL;DR: The method developed was applied with varying results to the analysis of natural water, haemodialysis fluids and microwave digested red wine samples from Tokat City, and the accuracy of procedure was confirmed by aluminium determination in certified reference materials.

TL;DR: Recent research on the determination of vanadium species is presented and some important problems concerning stability ofVanadium forms and proposed separation techniques are discussed.

TL;DR: In this paper, the authors investigated the properties of 1-decyl-3methylimidazolium bromide (DMImBr) and its mixtures with water in the whole proportions.

TL;DR: The study describes the experimental conditions and the choice of mass to detect uranium colloids in a single particle analysis mode and the performances are compared with that provided by scanning electron microscopy and single particle counting.

TL;DR: The developed procedure has been successfully utilized for the estimation of chromium(VI),chromium(total) (after oxidation with bromate) and chromium (III) (by subtracting chromia(VI) content from chromium-total) value contents of several tannery industries.

TL;DR: The correlation between organic material and oxalate contents suggests the origin of the films from degradation processes of past surface treatment.

TL;DR: The proposed sequential injection analysis (SIA) system was successfully applied for the determination of total iron as Fe(II) in pharmaceutical products (multi-vitamin tablets) and is especially useful for the determined of iron (II), yielding an orange-red colour complex with absorption maximum at 512nm.

TL;DR: The use of a carbon-nanotube paste (CNTP) electrode provides an effective means for the determination of homocysteine along with greatly enhanced signal-to-noise characteristics and the generic nature of this increased reactivity of the CNTP surface towards thiol moieties has been demonstrated with cysteine, glutathione and n-acetylcysteine.

TL;DR: A sensor to detect markers of cardiac muscle cell death at less than 3ngml(-1) and in less than 10min has been achieved and an in vivo sensor for the early detection of the onset of myocardial infarction (MI) will greatly enhance the patient care.

TL;DR: The modified CCEs containing NiHCF shows good repeatability, short response time, t 90%<3s, long term stability (3 months) and excellent catalytic activity.

TL;DR: A flow injection system incorporating a microcolumn of immobilized diethyldithiocarbamate on surfactant-coated alumina was combined with atomic absorption spectrometry for on-line trace enrichment and determination of silver in different matrices.

TL;DR: The attractive behavior of the new "mercury-free" chromium sensor holds great promise for on-site environmental and industrial monitoring of chromium (VI).

TL;DR: An amperometric nitrite sensor based on a polymeric nikel tetraaminothphalocyanine film coated glassy carbon (GC) electrode was developed and the proposed method was successfully applied in the detection of nitrite in real samples.

TL;DR: The potentiometric selectivity coefficient values as determined by match potential method (MPM) indicate good response for Cu(2+) in presence of interfering ions.

TL;DR: The presented paper provides useful information about state-of-the-art and possibilities offered by derivative spectrophotometry in pharmaceutical, clinical or environmental fields of analysis.

TL;DR: An amperometric biosensor was prepared by in situ deposition of horseradish peroxidase (HRP) enzyme on a polyaniline (PANI)-doped platinum disk electrode and cyclic voltammetric characterization showed two distinct redox peaks, which prove that the PANI film was electroactive and exhibited fast reversible electrochemistry.