Showing papers in "Talanta in 2001"

TL;DR: A review of the strategies employed to facilitate the detection, determination and monitoring of nitrate and/or nitrite is presented and the relevant analytical parameters (methodology, matrix, detection limits, range, etc.) tabulated.

TL;DR: Improvements have occurred in IMS on the understanding of reagent gas chemistries, the influence of temperature on ion stability, and sampling methods, and commercial instruments have been refined to provide fast and reliable measurements for on-site detection of explosives.

TL;DR: The practical aspects of supercritical fluid extraction applications in sample preparation, selection of modifiers, collection methods, on-line coupling techniques, means for avoiding mechanical problems, and approaches to optimization of SFE conditions are presented.

TL;DR: Analytical applications of electrogenerated chemiluminescence (ECL) are reviewed with emphasis on the years 1997-2000 and new developments and improvements of techniques and instrumentation and their application to analytes are described.

TL;DR: Instrumental methods, while they continue to improve, generally suffer from a lack of efficient sampling systems, selectivity problems in the presence of interfering odor chemicals and limited mobility/tracking ability.

TL;DR: The GC-ECD and HPLC-UV concentration estimates of explosives residues in field-contaminated soils from hazardous waste sites were compared, and correlation was excellent between the two methods of analysis for each of the compounds most frequently detected.

TL;DR: A review of nearly 60 artificial salivas was carried out to clarify the role of some of the compounds most frequently met in the proposed formulae and the SAGF medium was used as a reference and some in vitro behavioral tests of dental biomaterials were studied in a comparative way.

TL;DR: A sensitive and simple spectrophotometric method for the estimation of catechol and its derivatives like dopamine hydrochloride (DPH), levodopa (LDP), methyldopa (MDP) and adrenaline hydro chlorine (ADH) in both pure form and in pharmaceutical formulation, is described.

TL;DR: In the atmospheric aerosol research the newly developed sample preparation method facilitates the physical and chemical characterisation of water-soluble organic compounds without the interference of inorganic constituents.

TL;DR: A sensor for H( 2)O(2) amperometric detection based on a Prussian Blue bulk modified carbon screen-printed electrode was developed and has been optimised with respect to the lowest limit of detection achieved.

TL;DR: Pulsed fast/thermal neutron analysis (PFTNA) is a neutron-based technique which utilizes the (n,n'gamma), ( n,pgamma), and (n-gamma) reactions to identify and quantify a large number of elements.

TL;DR: This review describes the present knowledge regarding possibilities and errors that concern preparation steps and possible effects of the preparation procedure on the quality of measurement are also systematically discussed.

TL;DR: Fungal laccase was immobilized on carbon-fiber electrodes using classical methods: physical adsorption, glutaraldehyde, carbodiimide and carbodiIMide/glutaraldehyde to obtain a biosensor that showed an optimum response at pH 5.0 and at an applied potential of -100 mV.

TL;DR: Odor profiles of Galician wines from these years were clearly differentiated and a correct differentiation could be achieved between samples elaborated with different varieties, when principal component and linear discriminant analysis were applied to the OUV data.

TL;DR: The unique feature of the method is, the analytes are recovered quantitatively from AC by oxidizing and completely solubilising the carbon using concentrated nitric acid and perchloric acid, i.e. by wet ashing.

TL;DR: A new method for the determination of 4-nitrophenol(4-NP) by differential pulse voltammetry (DPV) based on adsorptive stripping technique was described, and the interference of organic and inorganic species on the voltammetric response have been studied.

TL;DR: It is believed that portal technology will mature, and the cost of portals will fall sufficiently to make widespread deployment of portals at security checkpoints a reality within the next decade.

TL;DR: A series of chemoselective polymers had been designed and synthesized to enhance the sorption properties of polymer coated chemical sensors for polynitroaromatic analytes, and the presence of hydrogen-bonding between polymer pendant groups and the nitro functional groups of polynite explosive materials was confirmed.

TL;DR: A thermodynamic investigation at 25 degrees C in the range of concentrations and pH corresponding to the solutions commonly used of titanium and titanium alloy biomaterials contributes to support the thermodynamic model.

TL;DR: The method has been applied to determine all the six metal ions in tap and river water samples and the cobalt content of pharmaceutical vitamin tablets is estimated by FAAS (RSD approximately 2%) after its preconcentration with the present chelating resin.

TL;DR: The equilibrium headspace above several military-grade explosives was sampled using solid phase microextraction fibers and the sorbed analytes determined using gas chromatography with an electron capture detector, and the environmental stability of the most important land mine signature chemicals was determined as a function of temperature.

TL;DR: Several Pattern Recognition methods, Principal Component Analysis and Linear Discriminant Analysis allowed discrimination between green and roasted arabica and robusta coffees.

TL;DR: The results demonstrated that uranium(VI) ions, at pH 4.5-7 could be sorbed completely using 0.1 g Amberlite XAD-16 resin loaded with DBBT, and the method was applied to the determination of uranium in synthetic samples.

TL;DR: Four silica gel-immobilized new metal chelate Schiff(,)s bases were synthesized and the reactivity of metal ion sorption was discussed in the light of effects of bulkiness as well as orientation of immobilized chelate on sorbent reactivity.

TL;DR: The performance of the proposed method is compared with ion chromatography for quantification of the anions in potable water, wastewater and in food samples, such as spinach and lettuce.

TL;DR: Electrochemical investigation of the interaction of rutin (Rt) with hemoglobin (Hb) at a glassy carbon electrode is reported for the first time and a satisfactory result has been obtained for the determination of hemoglobin in clinical blood samples.

TL;DR: The utilisation of catechol as an electrochemical indicator for the presence of sulphydryl thiols (RSH) has been investigated and the selectivity of the reaction has been assessed with no interference from lysine, tyrosine, methionine or cystine.

TL;DR: A new voltammetric method for the determination of phenol is described, which has a very sensitive oxidation peak at 0.47 V (vs. SCE) on the Nafion-modified glassy carbon electrode (GCE).

TL;DR: A mathematical model which relates the analytical signal to the analyte concentration was developed and the model served to obtain some of the thermodynamic constants of the system (the Michaelis constant and the turnover number) and the results were compared with those obtained by a commercial clinical analyzer.

TL;DR: General equations linking the c.m.c., molar volume, density and cloud-point temperature of the C(n)E(m) surfactants and their structure are proposed and discussed and showed that strong correlations existed between the structure of the molecule (n and m values) and its physicochemical properties.