Sonoelectroanalytical detection of lead at a bare copper electrode.
The sonochemically facilitated, mercury free detection of Pb2+ at a copper electrode has been investigated as a means of simplifying the quantification of this important analyte and to minimise the interference of copper ion. The procedure relies upon maximising the formation of Pb-Cu intermetallic compounds leading to the emergence of a single, easily quantifiable stripping signal. Linear responses to Pb2+ were obtained with a sensitivity comparable to that obtained at a bare glassy carbon electrode. Interference from Cu2+, Zn2+ and Cd2+ was assessed on the copper electrode with no appreciable change in the Pb2+ voltammetric profile observed. In contrast, bare glassy carbon showed a significant change in Pb2+ voltammetric profile as Cu2+ was added, due to the formation of intermetallic species.
Physical and Theoretical Chemistry Laboratory, University of Oxford, UK.
D F
DF
Tibbetts
J
J
Davis
R G
RG
Compton
D002138:Calibration; D003300:Copper / Q000009:adverse effects / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes / Q000592:standards; D007854:Lead / Q000032:analysis*; D011199:Potentiometry / Q000379:methods / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D007854:Lead; D003300:Copper