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High-performance liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS2) with a triple quadrupole is proposed for determining the synthetic phosphodiesterase-5 inhibitors, sildenafil, tadalafil and vardenafil, and the active metabolite N-desmethyl sildenafil. The method was successfully applied to the analysis of waters of different origins and human urine samples. Dispersive...
A procedure is presented for the determination of very low concentrations of lead and cadmium in water samples. Dispersive liquid-liquid microextraction with ammonium pyrrolidine dithiocarbamate is applied. The aqueous sample solution (adjusted to pH 6) is based on the rapidly mixed with of a small volume of a mixture of carbon tetrachloride and methanol. The two phases are separated by centrifugation,...
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