SENSITIVE METHOD FOR DETERMINATION OF LEAD BY POTASSIUM DICHROMATE LACTIC-ACID HYDRIDE GENERATION INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY

Continuous flow plumbane generation for sample introduction into an in ductively coupled plasma (ICP) and further determination of lead by at omic emission spectrometry (AES) has been investigated in order to inc rease the detection limits of conventional nebulization ICP-AES. Conti nuous hydride generation from different media is discussed and the gen eration of plumbane using potassium dichromate with lactic acid has be en selected. Sensitivity, selectivity and accuracy of the correspondin g determination of lead by ICP-AES are investigated. The proposed meth od (detection limit, 2 ng ml-1, precision 1.3% at the 50 ng ml-1 level ) has been applied to the determination of low levels of lead in soft drinks, sediments and lichens. The results obtained show good agreemen t with certified or expected values.