Showing papers in "Talanta in 1995"

TL;DR: The literature survey reveals the analytical details of the developed methodologies, and these have been examined in terms of the limit of detection, precision and accuracy.

TL;DR: An ion-exchange method has been developed for the separation of palladium, platinum and rhodium from a solution that is highly acidic and contains a considerable amount of lead, aluminum, iron and cerium obtained by leaching a used honeycomb type automotive catalytic converter.

TL;DR: Solver, an analysis tool incorporated into Microsoft Excel V 5.0 for Windows, has been evaluated for solving non-linear equations and the results suggest that solver can be successfully used for modelling data obtained in many analytical situations.

TL;DR: Ternary mixtures of colorants E-123 (Amaranth), E-124 (Ponceau 4R) and E-120 (Carminic acid) are resolved by using the first derivative ratio spectrum-zero crossing method without the need for any separation step.

TL;DR: The adsorption isotherms of MCl(2) and FeCl(3) by silica gel chemically modified with benzimidazole molecules were studied in ethanol solution and the material was applied in the preconcentration of metal ions from commercial ethanol normally used as engine fuel.

TL;DR: A sensitive spectrophotometric method was established for the determination of Diclofenac sodium with Methylene Blue as analytical reagent and good agreement with Beer's law was found in the range of DS concentrations.

TL;DR: A direct spectrophotometric method for the determination of aluminium with morin has been developed and was applied successfully to some certified reference material samples, environmental waters, biological samples, soils and complex synthetic mixtures.

TL;DR: Soil collected from a disused cattle dip in northern New South Wales was studied with the aim of developing an inexpensive, yet effective method for quantitative determination of arsenic(III), arsenic(V) and total organic arsenic in a contaminated soil.

TL;DR: Two infrared spectroscopic methods were applied to 24 cheese samples in order to obtain protein, fat and moisture contents and the superior results for optothermal spectroscopy are the more attractive because the instrument is easier to use than the FTIR-ATR instrument and it provides results more quickly with simpler statistical analysis.

TL;DR: Results clearly indicate that hydrophilic proteins can be successfully extracted with surfactant mediated phase separations (cloud point extractions) via use of the zwitterionic surfactants, 3-(nonyldimethylammonio)propylsulfate, and appropriate affinity ligands.

TL;DR: The instrumental development and analytical applications of derivative ultraviolet/visible region absorption spectrophotometry produced in the last seven years (since 1987) are reviewed in this article, where the authors present a review of the most important applications.

TL;DR: 2-Mercaptobenzothiazole loaded on previously treated clay was prepared, characterized and used for sorption and preconcentration of Hg(II, Pb(II), Zn( II), Cd (II), Cu (II) and Mn(II) from an aqueous solution.

TL;DR: It was possible to determine quantitatively trace and ultratrace amounts of yttrium, thorium, uranium and the lanthanides by inductively coupled plasma-mass spectrometry (ICP-MS) without any separation of matrix elements or preconcentration.

TL;DR: Two simple and sensitive extractive spectrophotometric methods for the determination of some fluoroquinolone derivatives with Supracene Violet 3B (SV 3B, method A) and tropaeolin 000 (TP 000, method B) are described.

TL;DR: The butyrylcholinesterase biosensor is seen as a potential analytical instrument for early warning against pesticide contaminations in soil, with resultant relative standard deviations of percentage enzyme inactivation less than 12%.

TL;DR: Dopamine is determined in the presence of a high concentration of ascorbic acid, up to 100 times that of dopamine, using ferroceneacetic acid as the most suitable mediator for this purpose using direct-current cyclic voltammetry.

TL;DR: An inexpensive and compact multi-wavelength photometer covering the visible range is obtained, which in many cases can replace a conventional spectrophotometer for absorbance measurements.

TL;DR: The resin synthesized by modification of aminated macroporous poly(vinyl chloride) resin with cyanoethylene and ethylenediamine has good reusability, and can be used for preconcentration and separation of Au(III), Pt(IV) and Pd(II) prior to their determination by ICP-AES with satisfactory results.

TL;DR: A polystyrene divinyl benzene based resin containing bicine groups shows promise for the separation of lead from other metal ions.

TL;DR: A method for elucidating metal ion binding mechanisms with water-soluble polymers has been developed in which the polymer is treated as a collection of monomeric units and predictions may be made as to metal ion separation using complexation-ultrafiltration techniques.

TL;DR: The on-line solid phase extraction of trace amount of lead in flow-injection system with flame AAS detection was investigated using cellulose sorbent with phosphonic acid and carboxymethyl groups, C(18) sorbent non-modified and modified with Pyrocatechol Violet or 8-quinolinol, commercial chelating sorbents Chelex 100 and Spheron Oxin 1000.

TL;DR: A new electrochemical biosensor was developed by incorporating an enzyme into a solid-paraffin-graphite-particle matrix and the biosensor response was characterized with respect to its response to dopamine.

TL;DR: The methods were used for the rapid and simple determination of ascorbic acid in soft drinks, preserved fruit juices and pharmaceuticals and the results thus produced compared with those obtained by previously checked methods involving titration with iodine, chloranil 2,6-dichlorophenolindophenol, and HPLC.

TL;DR: A new PVC membrane electrode based on lipophilic (2,9,16,23-tetra-tert-butylphthalocyanine)tin(IV) dichloride which demonstrates excellent selectivity and fast response toward the salicylate ion is described.

TL;DR: It is concluded that a sodium peroxide fusion followed by an anion-exchange separation does not appear to form the basis of a successful technique for the determination of platinum, palladium and gold in silicate rocks.

TL;DR: The method is put forward as a novel alternative stripping voltammetric method to those involving accumulation and determination as mercury or copper salts and complexes, in the knowledge that it may have advantages in particular analytical situations.

TL;DR: A method for the determination of ethanol in different types of wine was developed and applied to various samples in order to validate the proposed continuous separation approach.

TL;DR: The combination of fluorescence spectroscopy and multivariate calibration with conventional chemical data according to the near-infrared black box model is presented, and the refined sugar quality parameter, the ash content and the fluorescence emission spectra are correlated by a partial least-squares regression model.

TL;DR: A method was developed for direct determination of minor and trace amounts of Cr, Mn, Cu, Ni, Co, Li, Pb, Cd, Bi, Sb, Be and Ag in silicate rock, lake and stream sediments using a microwave oven dissolution method and a multi-element graphite furnace atomic absorption spectrometer equipped with a Zeeman-effect background correction device.