Abstract
Procedures are presented to determine simultaneously copper, lead and cadmium in seawater by differential pulse cathodic stripping voltammetry (DPCSV) preceded by adsorptive collection of complexes with 8-hydroxyquinoline (oxine) onto a hanging mercury drop electrode (HMDE). In preliminary experiments the optimal analytical conditions were found to be an oxine concentration of between 0.8 and 2 × 10 −5 M, a pH between 7.5 and 8, the adsorption potential at −1.1 V, and the initial scanning potential at −0.3 V. The peak heights for low levels (sub-nanomolar) of cadmium and lead increase linearly with the adsorption time between 1 and 12 min. The limits of detection for a 1 min stirred adsorption time are 0.12 n M Cd, 0.3 n M Pb and 0.24 n M Cu; these limits are reduced 10x by increasing the adsorption time to 10 min. In these conditions most seawater samples are amenable for direct voltammetric determination of copper, cadmium and lead using an HMDE.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
