Detection Of Thallium Research Articles

Chromophoric thin film based on cellulose triacetate blends for sensing metal ions

Abstract Chromophoric sensors were made based on 8-hydroxyquinoline immobilized onto a thin film of a polymer blend matrix. The thin films were made by the solution casting method using cellulose triacetate and polyethylene glycol (PEG 600) as plasticizer and pore-forming agent. Different contents of PEG 600 additive were investigated. The prepared films were characterized by FTIR and thermal analysis. The absorption and fluorescence spectra of different films were dependent on the content of PEG 600 with clear quenching of the fluorescence of the film that contains PEG 600 compared to that with zero content. This behavior was attributed to the collective effect of hydrogen bonding (intra- and intermolecular hydrogen bonding) that enhances the process of excited-state proton transfer. This result is favorable to a responsive sensor that shows fluorescence off in the absence of metal ions and fluorescence on upon metal ion chelation. The detection of 5 × 10−5 M of Al3+, Zn2+ and thallium (I) in aqueous solution has been observed with the fluorescence method. The result obtained is consistent with the enhancing effect of PEG 600 in the detectability of metal ions. Compared with the detection of Al3+ and Zn2+, the sensor shows better detection of thallium (I), with clear fluorescence spectra.

Detection of Thallium and Uranium in Well Water and Biological Specimens of an Eastern Croatian Population

Abstract Using inductively-coupled plasma mass spectrometry (ICP-MS), we measured the concentrations of thallium and uranium in local water resources from three villages (Ćelije, Draž, and Potnjani) in eastern Croatia, with the aim to determine if they were associated with the levels of these same elements in the serum, urine, and hair collected from the residents of this area. The exposure of the local population to thallium and uranium through drinking water was generally low. ICP-MS was capable of measuring the levels of both of the elements in almost all of the analysed samples. Although there were differences in the concentrations of both elements in water samples and biological specimens taken from the residents, they did not reach the maximum contaminant level in any of the four sample types studied. Although hair was previously reported as an excellent indicator of occupational and environmental exposure to various elements, our study did not confirm it as a reliable biological material for tracing thallium and uranium levels, mainly due to the very low concentrations of these elements, often well below the detection limit. However, our results have shown that the concentration of thallium and uranium in drinking water can be effectively traced in urine samples.

Abundance and Isotopic Anomalies of Thallium in the Atmosphere of the HgMn Star chi LUPI

We announce the detection of two fully resolved hyperfine components of the intercombination line of Tl II (Z = 81) at 1908.6 Angstrom in the ultraviolet spectrum of the sharp-lined, nonmagnetic, chemically peculiar star chi Lupi (BB.5pHgMn + A2 Vm). The wavelengths and profiles of these absorption lines strongly suggest that they arise from the heaviest isotope, Tl-205. The echelle observations were obtained with the Hubble Space Telescope Goddard High Resolution Spectrograph (HST/GHRS). Spectrum synthesis fits to the line profiles yield a logarithmic overabundance of thallium, relative to the solar system abundance, of +3.8 dex. We believe this to be the first detection of thallium in a star other than the Sun. It is also the first time hyperfine structure has been resolved in the satellite ultraviolet spectrum of an astrophysical source. The large overabundance and the presence of only the heaviest isotope of the element continue the pattern observed previously in chi Lup for platinum (Z = 78), gold (Z = 79), and mercury (Z = 80). (Less)

The histochemical detection of thallium in paraffin-embedded tissues by the sulfide-selenium-silver method.

Thallium can be histochemically localized in formalin-fixed, paraffin-processed tissues by treating sections, after passing them through xylene and graded alcohols to water, with gaseous H2S for 15 min and with 20% ammonium sulfide saturated with powdered selenium for 10 min. Sections are then washed, treated 10 min with 20% H2O2, and incubated in darkness for 20-30 min in the following mixture: 25% gum acacia, 10 ml; 2% hydroquinone in 5% citric acid, 1 ml; and 10% AgNO3, 0.1 ml. Tissues and cells, which contain thallium, are demonstrated by small black granules of silver.

Studies on Inorganic Paper Chromatography. XXIV-XXV. XXIV. Separation and Detection of Thallium, Iron, Titanium and Zirconium and their Application to the Systematic Analysis.

Studies on Inorganic Paper Chromatography. XXIV-XXV. XXIV. Separation and Detection of Thallium, Iron, Titanium and Zirconium and their Application to the Systematic Analysis.