Speciation analysis of Sb(III) and Sb(V) in antileishmaniotic drug using Dowex 1 x 4 resin from hydrochloric acid solution.

A new and simple method for the direct and simultaneous determination of Sb(III) and Sb(V) in meglumine antimoniate, the first-choice drug for leishmaniasis treatment, was developed. Speciation analysis was carried out using the quantitative separation of inorganic trivalent and pentavalent antimony on Dowex 1 x 4 resin from 1.5 mol l(-1) hydrochloric acid solution. The inductively coupled plasma optical emission spectrometry (ICP-OES) was used for determination of antimony. The interfering effects of As, Bi, Cd, Cu, Mn, Pb and Zn were examined and only Bi was found to be a significant interferent. The liberation of Sb(V) and Sb(III) from organoantimonial compounds without changing of oxidation state was carried out by means of 1.5 mol l(-1) hydrochloric acid solution. The spike recovery values obtained for Sb(III) in pharmaceutical sample varied from 92 to 100%. The method was successfully applied for the direct determination of antimony(III) and of antimony(V) in meglumine antimoniate.

Application of Metalfix Chelamine prior to the determination of noble metals by the inductively coupled plasma atomic emission spectrometry.

Metalfix Chelamine chelating resins of two different bead sizes (150-300 and 40-80mum) were examined and compared regarding their application for sorption of Au, Ir, Pd, Pt, Rh and Ru ions from medium of HCl, HNO(3) and mixtures of HCl and HNO(3). The quantitative enrichment of Au, Ir, Pd and Pt was established for the resin of 150-300mum particle size and for solutions acidified with HCl and HNO(3) (3:1) up to the concentration of 0.50moll(-1). In the case of Rh and Ru, the uptake of these metals by the resin was lower than 50%. For the elution, solutions of different reagents, i.e. HCl, HNO(3), KCN, KI, KSCN and (NH(2))(2)CS, were studied with respect to the complete release of the analytes retained by the resin. In addition, influence of various base metals, i.e. Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, on the retention of the noble metals was investigated. Under the selected conditions for the retention and elution of Au, Ir, Pd and Pt, the analytical performance of the proposed pre-concentration procedure was evaluated and it was applied to the determination of these noble metals in anodic sludge sample.

Boron content in daily meals for preschool children and school youth.

Boron content in daily meals for preschool children and school youth was studied in this research. The boron content was measured in the meals taken from Wroclaw preschool and boarding school in December, March, June, and September. The whole meal was homogenized. Four grams of sample were mineralized and analyzed by inductively coupled plasma-optical emission spectroscopy (ICP-OES). Statistical assessment of the results was made with the Statistica v.5.1 program. The recovery was determined by the use of the standard additions method to evaluate the accuracy of the procedure. The mean boron content in 1 kg dry weight of a preschool meal was 2.31 mg B/kg dry wt, and in boarding-school meals, it was 2.15 mg B/kg dry wt. Based on these results, the estimated daily boron intake was calculated. The daily boron intake from food by preschool children was found to be 1.01 mg B/d for children and 1.2 mg B/d for youth. The actual intake of boron from food was determined after having related the quantity of the element to 1 kg of body weight. In the case of children, the mean intake of boron was 0.05 mg B/kg body wt/d, whereas in teenagers, it was 0.016 mg B/kg body wt/d. The results of this research show no significant differences between daily boron intake for preschool children and boarding-school youth.

Determination of metal concentrations in animal hair by the ICP method: comparison of various washing procedures.

Concentrations of minor and trace elements (Mg, Ca, Fe, Ba, Cu, Zn, Cd, Ni, Al, Mn, Cr, Ti, and V) in the hair of three races of dogs (fox terrier, schnauzer, and mini schnauzer) were analyzed by the inductively coupled plasma-atomic emission spectrometry method. The influence of five washing solutions, deionized water, acetone, methanol, EDTA, and Triton X-100, on the concentrations measured in hair was investigated. Triton X-100 was found to be suitable to use for the removal of exogenous elements in multielemental hair analysis. Additionally, the results indicated that the concentration of the elements measured in the dogs' hair were similar to those reported for human hair. The relation between the element content in the dog hair and its color were similar to those found for human hair.

Near-Infrared Electronic Transitions of Pb(2).

Emission spectra of two new electronic transitions of Pb(2) have been measured with a Fourier transform spectrometer in the 5200-8500 cm(-1) range. The emissions were observed from the afterglow of a microwave discharge in a mixture of Pb(x) vapor with hydrogen and argon carrier gas. By comparison with the results of ab initio calculations, the spectra are assigned to transitions from the lowest 1(g) and 1(u) states to the X(1)0(+)(g) ground state. The X(2)1(g) --> X(1)0(+)(g) transition between the fine-structure components of the X(3)Sigma(-)(g) ground state must be magnetic dipole in nature and thus is the first purely magnetic dipole fine-structure transition observed in the optical region. The 1(u) state is mostly a component of the low-lying inverted A(3)Pi(u) state and so is denoted A(2)1(u). Vibrational analyses have yielded the following electronic energies and vibrational constants for (208)Pb(2) (in cm(-1)): X(1)0(+)(g): omega(e) = 110.20(2), omega(e)x(e) = 0.341(2); X(2)1(g): T(e) = 5304.9(1), omega(e) = 120.57(7), omega(e)x(e) = 0.254(14); A(2)1(u): T(e) = 7817.5(2), omega(e) = 126.45(6), omega(e)x(e) = 0.399(11), where the numbers in parentheses are the standard deviations of the parameters. Copyright 2000 Academic Press.

Experimental and Theoretical Study of the Electronic States and Spectra of BiNa.

Gas-phase emission spectra of the hitherto unknown free radical BiNa have been measured in the NIR range with a Fourier transform spectrometer. The emissions were observed from a fast-flow system in which bismuth vapor in argon carrier gas was passed through a microwave discharge and mixed with sodium vapor in an observation tube. Two systems of blue-degraded bands observed in the ranges 8900-9800 and 7200-7800 cm(-1) were measured at high spectral resolution and vibrational and rotational analyses were performed. To aid in the analysis of the experimental data, a series of relativistic configuration interaction calculations has been carried out to obtain potential curves for the low-lying states of BiNa and also electric dipole transition moments connecting them. As in the isovalent BiH system, the ground state of BiNa is found to be X(3)Sigma(-) with a spin splitting of about 1769 cm(-1). The first excited state is A(3)Pi, and the observed band systems are assigned to the transitions A(3)Pi(A(2)0(+)) --> X(3)Sigma(-)(X(1)0(+), X(2)1). Comparison with earlier work on the isovalent BiH system emphasizes that the relative weakness of the varsigma MO in BiNa is responsible for qualitative differences in the electronic spectra of these two systems. Copyright 2000 Academic Press.

[Experimental in vitro model of an artificial kidney--measurement of trace element levels using the ICP method. Preliminary studies]. / Eksperymentalny uklad in vitro sztucznej nerki--badania stezen pierwiastków sladowych metoda ICP. Doniesienie wstepne.

Trace elements in blood serum is significantly changed in hemodialysed patients. The result of our experiment showed the manner and directions of the evaluated trace elements -Sr, Zn, Ni, Ba, B, Si, Mn and Cu movements. It was confirmed that reverse osmosis is efficient in the most tracers elimination, except Si, B, and Cu. The trace elements being present in the whole arrangement diffuse easily through the dialysers membrane used in our experiment, except Ni. In the membrane of the new, non-rinsed dialyser we detected Pb, Fe, V, Be, Ti and Al. It could possibly be the source of their contamination into the human organism. ICP-AES method of trace elements analysis reveals the possibilities of precisely, fast and simultaneous evaluation of big number various trace elements.