Showing papers in "Microchemical Journal in 2002"

TL;DR: In this article, a white rot fungus species Lentinus sajor-caju biomass was entrapped into alginate gel via a liquid curing method in the presence of Ca(II) ions.

TL;DR: X-Ray Raman scattering (XRS) as mentioned in this paper provides a means for obtaining the information content of soft X-ray spectra while maintaining the experimental benefits of hard Xray techniques.

TL;DR: A review of the OPLC and high performance liquid chromatographic methods most often used for the analysis of aflatoxins is presented in this article, where the results of the proposed validation procedure, whose development was based on the guideline of the International Conference on Harmonization (ICH) for pharmaceutical products (1994, Brussels), for the determination of the above-mentioned aflatoxin in wheat samples are also presented.

TL;DR: In this article, the original BCR extraction scheme was modified and applied to study the partitioning of metals in fly ashes, and the efficiency of the extraction process for each step was examined.

TL;DR: In this article, the preliminary findings of an environmental survey carried out at an abandoned mining site were reported, which indicated that Pb concentration remains almost constant in samples taken at various depths and that As and Hg levels are quite similar.

TL;DR: In this paper, the authors used X-ray absorption spectroscopy to probe the oxidation state and chemical speciation of a number of essential and non-essential elements, identifying certain common themes in the physiology and biochemistry of trace element (hyper)accumulation by plants.

TL;DR: In this article, the degradation of lipidic paint binders induced by irradiation with UV light (365 nm), exposure to urban air pollutants such as NOx and SO2 and combinations of the various treatments was investigated.

TL;DR: In this article, an electrochemical investigation of the interaction between quercetin and DNA is reported for the first time, and the authors assume that quercETin interacting with DNA produces an electrochemically inactive supramolecular complex via intercalation.

TL;DR: In this article, a simple and practical preconcentration method using cloud point approach is proposed for the extraction and preconconcentration of Cu (II) in drinking and rainwater, serum and human hair samples.

TL;DR: In this paper, a micro-method by HPLC was performed for aflatoxins and ochratoxin A (OA) in dust samples, and workers' sera were collected in order to check the biomarker of exposure for OA.

TL;DR: In this paper, the most important key species of Antarctic marine food web, Euphausia superba and Pleuragramma antarcticum sampled in the Ross Sea, were evaluated for concentrations of the following persistent organic pollutants: polychlorinated biphenyls (PCBs), chlorinated pesticides such as hexachlorobenzene (HCB), and p,p′-DDE.

TL;DR: In this paper, the authors used inductively coupled plasma atomic emission spectrometry (ICP-AES), quadrupole inductively-coupled plasma mass spectrometric (Q-ICP)-MS and magnetic sector high-resolution inductive coupled plasma mass analyser (HR-ICP-MS) for the determination of total As in rice.

TL;DR: Phanerochaete chrysosporium basidiospores immobilized onto carboxymethylcellulose were used for the removal of mercury ions from aqueous solutions and correlation regression coefficients show that the adsorption process can be well defined by a Langmuir equation.

TL;DR: In this article, the voltammetric behavior of uric acid (UA) was studied with an Au electrode modified with single-wall carbon nanotubes (SWNTs).

TL;DR: In this paper, the authors used X-ray absorption spectroscopy (XAS) to investigate the binding mechanism of heavy metals to hops biomass, and they found that copper, zinc, and chromium remained in the same oxidation state as when they were reacted with the hops biomass.

TL;DR: In this article, the interaction between gold(III) and alfalfa biomass was investigated and it was found that gold binding is rapid, pH independent, and increases with temperature.

TL;DR: In this paper, a comparison study with ion exchange resins containing carboxyl, thiol, amino, sulfonic, and phosphate groups was conducted to determine how modification of chemical groups present on the alfalfa biomass affect the chromium(III) binding.

TL;DR: In this paper, the extraction of Cu(II) from aqueous solution using N,N′-bis(2-hydroxy-5-bromo-benzyl)1,2 diaminopropane (H2L) as the new extractant has been studied.

TL;DR: Batch experiments were performed and suggest that carboxyl groups play a significant role in the binding of lead(II) groups, thus aiding in the understanding of the mechanisms involved in the removal and recovery of metal ions from contaminated waters through phytofiltration.

TL;DR: In this article, the characterization of a Fe-silicalite sample having a sufficient iron dilution (SiyFes90) to be considered a "true" catalysts in partial oxidation reactions (e.g. benzene™phenol).

TL;DR: In this paper, the role of iron in authentic and synthetic samples of Maya blue using X-ray absorption spectroscopy (XAS) and high-resolution transmission electron microscopy (HRTEM) was investigated.

TL;DR: In this paper, the authors used X-ray absorption spectroscopy to determine the nature of the zinc center in Datura innoxia plant tissue culture exposed to 250 μM, 500 μM and 1000 μM Zn2+ for 4 days.

TL;DR: In this article, an ion chromatographic method has been developed for the determination of some microelements in different types of milk, which involves oxidative photodegradation of the organic matrix with H2O2 in a UV digester, equipped with a high-pressure mercury lamp.

TL;DR: In this article, a fluorometric technique has been developed to study chromium speciation, based on optimised conditions using chemometric methods of experimental design and central composite design and it was found that the analytical performance for measurement at the point of optimum in this technique is superior and more accurate than that of one variable at a time.

TL;DR: Palladium, platinum and rhodium impurities were determined in pharmaceuticals by ICP-MS and TXRF methods as mentioned in this paper, and the detection limits were 15.8, 2.5 and 2.4 ng/g for palladium in enalapril maleate, platinum in calcium folinate, and Rhodium in levodopa, respectively.

TL;DR: In this article, heavy metals variation in tree rings of Larix decidua have been determined to assess whether this arboreal species can be used as bio-geochemical tracers of heavy metal pollution to the alpine environment.

TL;DR: In this paper, a highly selective electrode for iodide ion based on a thiopyrilium derivative as an excellent ionophore is described, which is applied as an indicator electrode in titration of iodide with Ag +.

TL;DR: In this paper, cyclic voltammetry and chronocoulometry were used to characterize thin films of Co(III/II)- and Zn(II)-4,9,16,23-tetraaminophthalocyanine, immersed in solutions of relatively high pH, have been studied electro- and spectro-chemically.

TL;DR: In this paper, some of the key aspects of outdoor and indoor free radical chemistry are discussed together with the experimental evidences so far obtained for the occurrence of radicals and radical chain reactions in such environments.