A simple sample pre-treatment method utilizing hollow fibre supported liquid membrane (HFSLM) was carried out on pharmaceuticals samples comprising of cough syrups (CS1 and CS2) and an antiinflammatory product (AI). The active ingredients targeted in the extraction process were diphenylhydramine (DPH), chlorpheniramine (CPA) [(S)-γ-(4-chlorophenyl)-N,N-dimethyl-2-pyridinepropanamine maleate sal...

A simple biodegradation system consisting of an air stripping tank and a bioreactor was proposed for the treatment of volatile organic chemicals in wastewater. Toluene was used as a model of volatile organic chemicals. An aqueous solution of toluene and a basic mineral medium were placed in the air stripping tank and bioreactor, respectively. Toluene was stripped by supplying compressed air int...

The influence of the ligand/metal ion concentration ratio on the shape, peak current and peak potential of curves obtained by anodic stripping voltammetry (a.s.v.) at the hanging mercury drop electrode is described, particularly with respect to the use of a.s.v. for speciation of metal ions at very low concentrations as is often found in natural waters. The lead(II)/triethylenetetramine system ...

In this study, solvent extraction method has been utilized for separation of molybdenum and vanadium from nitrate solution by utilizing coupling of acid and solvating extractants (D2EHPA and TBP extractants). The outcomes demonstrated that synergistic solvent extraction improves stability of formatted complexes for transfer to the organic phase. The main parameters such as pH value, concentrati...

Electrochemistry of lercanidipine (LCN) was investigated and its optimal conditions were evaluated based on the irreversible and diffusion-controlled electrochemical oxidation signal (+ 0.93 V) of a carbon paste electrode (CPE) versus Ag/AgCl in Britton Robinson buffer (BR) and ethanol mixture of pH 4.5. Electrochemical determination was performed by square wave anodic adsorptive stripping volt...

BACKGROUND Epicutaneous immunotherapy targets the network of dendritic cells in the epidermis. Allergen exposure of the dermal layers should be limited as these contain mast cells and blood vessels, which increases the risk for local and systemic allergic reactions. METHODS This intraindividually controlled trial included 20 subjects with birch pollen allergy. Three areas of the volar forearm...

It is well known that lead and cadmium can be determined with good sensitivity using anodic stripping voltammetry (ASV) and a mercury ®lm electrode. However, the mercury ®lm formation is poorly reproducible and cannot fully be removed electrochemically. We have evaluated procedures to improve the reproducibility and sensitivity of the ASV method and found that in the presence of thiocyanate the...

The solvent extraction of gallium from a concentrated Jajarm Bayer process liquor containing 164.90 g/l of Na2O, 86.70 g/l of Al2O3 and 106.02 ppm of gallium was investigated using 10 vol.% Kelex100, a 7-alkyl substituted-8 hydroxyquinoline as an extractant, 10 vol.% etanol as a modifier and kerosene as a diluent. At (Vo :Va = 1.0:1.0) ...

The preparation of highly pure vanadyl sulfate from sulfate solutions containing impurities of iron and aluminumwas investigated by solvent extraction with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (EHEHPA) and tri-n-butyl phosphate (TBP) as the phase modifier. The extraction and stripping conditions of vanadium (IV) and its separation from iron and aluminum were optimized. Under the...

the solvent extraction of gallium from a concentrated jajarm bayer process liquor containing 164.90 g/l of na2o, 86.70 g/l of al2o3 and 106.02 ppm of gallium was investigated using 10 vol.% kelex100, a 7-alkyl substituted-8 hydroxyquinoline as an extractant, 10 vol.% etanol as a modifier and kerosene as a diluent. at (vo :va = 1.0:1.0) organic to aqueous phase ratio and at room temperature, 93....