Determination of trace aluminium by adsorptive stripping voltammetry on a preplated bismuth-film electrode in the presence of cupferron.

This work reports the use of adsorptive stripping voltammetry (AdSV) for the determination of aluminium on a rotating-disc bismuth-film electrode (BiFE). Al(III) ions in the non-deoxygenated sample were complexed with cupferron and the complex was accumulated by adsorption on the surface of the preplated BiFE. The stripping step was carried out by using a square-wave (SW) potential-time voltammetric excitation signal.

A study of bismuth-film electrodes for the detection of trace metals by anodic stripping voltammetry and their application to the determination of Pb and Zn in tapwater and human hair.

This work reports the simultaneous determination of Cd(II), Pb(II) and Zn(II) at the low mug l(-1) concentration levels by square wave anodic stripping voltammetry (SWASV) on a bismuth-film electrode (BFE) plated in situ. The metal ions and bismuth were simultaneously deposited by reduction at -1.4 V on a rotating glassy carbon disk electrode.

Highly selective flow injection spectrophotometric determination of gold based on its catalytic effect on the oxidation of variamine blue by potassium iodate in aqueous N,N-dimethylformamide medium.

A highly selective and simple flow injection method is reported for the determination of Au(III) in jewel samples. The method is based on the catalytic effect of Au(III) on the oxidation of 4-amino-4'-methoxydiphenylamine hydrochloride (Variamine Blue B base, VB) by KIO(3). The colored reaction product was monitored spectrophotometrically at 546nm.

Dacryoliths in a series of dacryocystorhinostomies: histologic and chemical analysis.

Purpose: To present the clinical and intraoperative characteristics of dacryolith cases, to present their histologic and chemical analysis, and to relate the findings with the probable causes of their formation in a series of dacryocystorhinostomies performed in northern Greece.

Methods: In a series of 242 dacryocystorhinostomies in patients with chronic dacryocystitis, dacryoliths large enough to perform an accurate chemical analysis and a light histologic examination were found in five cases. The chemical analysis was based on atomic absorption spectrophotometry and atomic emission spectrometry.

Size distribution of trace elements and polycyclic aromatic hydrocarbons in fly ashes generated in Greek lignite-fired power plants.

The fly ashes arrested by the electrostatic precipitators of four large lignite-fired Greek power stations (total installed capacity 4048 MW) were investigated regarding the distribution of 27 major, minor and trace elements and 13 polycyclic aromatic hydrocarbons (PAHs) in six size ranges from <40 to >105 microm. An inverse relationship of concentration with particle size was observed for trace elements, such as As, Se, Zn, Pb, Cd, as well as for Ca, whereas the distribution of the matrix elements Al, Si, Ti, Fe, Mg was fairly flat up to 105 microm with relative enrichment or depletion in larger particle sizes. A reverse relationship of concentration with particle size was also revealed for all PAHs, particularly the heavier compounds.