Non-dispersive atomic-fluorescence spectrometric determination of lead by the hydride-generation technique.
Non-dispersive atomic-fluorescence spectrometry combined with hydride-generation has been developed for lead determination. A radiofrequency-excited electrodeless discharge lamp was used as light-source and a small argon-hydrogen flame as atomizer. The detection limit was 0.06ng/ml and the linear calibration graph was linear up 300ng/ml, with a precision of 5-6% over the dynamic range. Interference studies and optimization of the experimental parameters are reported. Severe suppression of the lead signal was observed in presence of Cu, Se or Te. An empirical equation was obtained for predicting the effect of copper on the lead signal at various concentration ratios. The strong effect of complexing agents such as EDTA was removed by addition of zinc salts.
D'livo
A
A
Istituto di Chimica Analitica Strumentale del C.N.R., c/o Istituto di Chimica Analitica ed Elettrochimica dell'Universitàdi Pisa, Via Risorgimento 35, 56100 Pisa, Italy.
Papoff
P
P