Showing papers in "Talanta in 2003"

TL;DR: FT-IR was used successfully for the simultaneous quantitative analysis of calcium carbonate phases (calcite, aragonite, vaterite) in ternary mixtures and a set of equations based on Beer's law was developed to overcome the absorption band overlapping.

TL;DR: A rigorous account of the existing detection protocols for homocysteine in biological fluids is given, as well as trying to anticipate possible future trends in the development of rapid, low-cost and sensitive assays for its detection.

TL;DR: The stability of APS in ethanol and that of mercaptopropyl-grafted silica (MPS) in water have been briefly considered and discussed with respect to practical applications of silica-based organic-inorganic hybrids, e.g., in separation science or in the field of electrochemical sensors.

TL;DR: BFE's were successfully applied to the determination of Pb and Zn in tapwater and human hair and the results were in satisfactory statistical agreement with atomic absorption spectroscopy (AAS).

TL;DR: Through arsenate determination, this colorimetric method allowed the arsenite oxidation efficiency of five common industrial oxidants to be compared and FeCl(3) was the most effective oxidant among the reagents tested here.

TL;DR: The sensor works well in the pH range 2.1-6.3 and could be satisfactorily used in presence of 40% (v/v) methanol, ethanol and acetone and is selective for copper over a large number of cations with slight interference from Na(+) and Co(2+) if present at a level 1.5x10(-5) M.

TL;DR: The HRP immobilized on nano-Au displayed excellent electrocatalytical activity to the reduction of H(2)O(2), and the analysis results of real sample by this sensor were in satisfactory agreement with those of the potassium permanganate titration method.

TL;DR: Data suggest that PEDT film is a promising PPO immobilisation method for determination of phenolic compounds and herbicides.

TL;DR: High repeatability and adequate sensitivity to detect small increments in the concentrations of cysteinylglycine and hCys were achieved and the chromatograms obtained using TCDI contained fewer and better-resolved peaks than those produced by less selective reagents used previously.

TL;DR: A microwave digestion technique was developed to determine the content of nine heavy metals in sediments and soils and demonstrated that the proposed method is precise and accurate.

TL;DR: A new micelle-mediated phase separation of metal ions, applied for preconcentrating trace levels of cobalt as a prior step to its determination by flame atomic spectroscopy, has been developed.

TL;DR: A renewable three-dimensional chemically modified carbon ceramic electrode containing Ru [(tpy)(bpy)Cl] PF(6) was constructed by sol-gel technique and exhibits an excellent electro-catalytic activity for oxidation of l-cysteine and glutathione at pH range 2-8.

TL;DR: A new ion-selective PVC membrane electrode based on salicylaldehyde thiosemicarbazone as an ionophore is developed successfully as sensor for mercury(II) ions and shows excellent potentiometric response characteristics.

TL;DR: The total current obtained with the negative corona discharge was about 100 times larger than that of IMS based on (63)Ni, which results in a lower detection limit and a wider linear dynamic range.

TL;DR: The results indicate that this electrode is sensitive and effective for the simultaneous determination of Pb(2+) and Cd(2+).

TL;DR: This technique of monitoring the levels of endocrine-disruptors in blood samples is consistent, reliable and cost effective while reducing wastage of time and solvents.

TL;DR: A simple and sensitive fluorimetric method for the determination of ascorbic acid (AA) is described, based on the condensation reaction between AA and o-phenylenediamine in the absence of the oxidant.

TL;DR: Cluster analysis and principal component analysis show differences in wines according to the island of origin and the ripening state of the grapes, with significant differences in mean content.

TL;DR: Genetic algorithm (GA) is a suitable method for selecting wavelengths for PLS (partial least squares) calibration of mixtures with almost identical spectra without loss of prediction capacity using spectrophotometric method.

TL;DR: It has been observed that the fluorescence decay due to peroxyl radical attack on B-PE decreases exponentially with time, and it is confirmed that quercetin is the most antioxidant of the four polyphenolics.

TL;DR: The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQ(x)) to anchor 8-quinolinol ligand on the Silica gel, which was characterised with cross polarisation magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformation (DRIFT) spectroscopy to determine the metal ions.

TL;DR: A simple pH probe is developed based upon the covalent chemical derivatisation of carbon particles with anthraquinone, showing a Nernstian linear response to pH from 1 to 9, consistent with a two-electron, two-proton electrochemical process.

TL;DR: A novel spectrofluorimetric determination of ibuprofen in the presence of beta-CD uses second-order fluorescence excitation-emission matrices coupled to an algorithm based on self-weighted alternating trilinear decomposition (SWATLD), and avoids resorting to separative instrumental analyses.

TL;DR: Different techniques and methodologies used in measuring NO in biological samples, including gas and liquid phase chemiluminescence, electron spin resonance spectroscopy, UV-visible spectroscopic, fluorescence, electrochemical sensors, and reporter cell assay are summarized.

TL;DR: The analysis of about 60 samples of wall paintings showed that the mortar preparation generally showed a porous layer, with crushed grains under the pigment layer, but in certain cases two superposed pigment layers were found: yellow superimposed on both red and pink, black on pink, green on black.

TL;DR: The total content of vanadium in the five soil fractions was in good correlation with the totalcontent of this element in both soils found after HF-H(2)SO(4) digestion, indicating input by anthropogenic activities.

TL;DR: An analytical method using silica gel chemically modified with zirconium (IV) phosphate for preconcentration of lead and copper, in a column system, and their sequential determination by flame atomic absorption spectrometry (FAAS), was developed and was applied for the determination oflead and copper in industrial and river waters.

TL;DR: 1-(2-pyridylazo) 2-naphtol (PAN) impregnated Ambersorb 563 resin was used as solid phase extractor of copper, nickel, cadmium, lead, chromium and cobalt ions in aqueous solutions prior to their atomic absorption spectrometric determinations.

TL;DR: A commercial cation exchange resin Amberlite 200 has been modified after immersion in solutions of polyethyleneimine (PEI) and the results revealed the effect of PEI on the exchange properties of the resin.

TL;DR: Multi-element determination of trace elements in urine and dialysis solutions by atomic absorption spectrometry has been investigated and coprecipitation with samarium hydroxide was used for preconcentration of Trace elements and elimination of matrix elements.