Differential pulse polarography in the alternating pulse mode.
A polarographic two-drop pulse technique for trace analysis is described. By using a second pulse, in the opposite direction to the first one, on the second drop, a high current sensitivity is obtained, with a very flat background. The theoretical response for a reversible electrode process is presented together with experimental results for the reduction of Pb(2+) in hydrochloric acid medium. It is shown that without enrichment determination of lead at concentrations as low as 71nM is possible with this technique.
Urbaniczky
C
C
Department of Analytical Chemistry, University of Uppsala, P.O. Box 531, S-751 21 Uppsala, Sweden.