DETERMINATION OF BISMUTH IN LEAD AND IN A LEAD-LITHIUM ALLOY BY STRIPPING VOLTAMMETRIC ASSAY

The method developed allows the fast determination of bismuth in lead in the lower ng/ml range. It is not necessary to separate the matrix so that any impairment of results caused by entrainment effects is eliminated. Compared to GFAAS, stripping voltammetry offers a means of determining several elements. Moreover the linear range of the calibration curve extends over three decades. Using automated sampling, sample preparation and transfer into the measuring vessel, the method is suited for application in a bypass mode so that the process of separating bismuth from lead can be controlled. Among the elements studied, only copper produces interference at a concentration excess greater than 140 times.