Optimization of comprehensive speciation of organotin compounds in environmental samples by capillary gas chromatography helium microwave-induced plasma emission spectrometry.
Résumé
The potential of the microwave-induced plasma at. emission detector for capillary gas chromatog. (GC-AED) as a tool for the speciation of organotin compds. in environmental samples is studied. The operational variables are optimized for chromatog. resoln. and detection limits. A comprehensive method for the detn. of mono-, di-, tri-, and some tetraalkylated organotin compds. in water and sediments by GC-AED is developed. Ionic organotin compds. are extd. as diethyldithiocarbamates into pentane and, after its evapn., dissolved in a small vol. of octane and derivatized by pentylmagnesium bromide to give the soln. of gas chromatographable species. The abs. detection limit is about 0.05 pg (as Sn), and the calibration graph is linear over three decades. The anal. response is independent of the elution temp. of the compd. allowing for internal std. calibration. The accuracy of the method developed is confirmed by independent anal. by GC-AAS. A method to det. the empirical formula of the compds. detected is proposed. [on SciFinder(R)]
Mots clés
environmental analysis organotin GC plasma emission
gas chromatog organotin detn environment
microwave plasma emission detection organotin GC
organotin detn environment GC plasma emission
plasma emission detection organotin GC
sediment analysis organotin GC
tin org detn environment gas chromatog
water analysis organotin GC