Determination of Cadmium, Copper, and Lead In Seawater by Differential
Pulse Anodic Stripping Voltammetry
Irdhawati*, I WayanHermawan, and Emmy Sahara
Department of Chemistry, Faculty of Science, Udayana University,
Jl. By Pass NgurahRaiKampus Bukit Jimbaran Bali 80361 Indonesia
*Corresponding author: irdhawati@unud.ac.id
ABSTRACT
Heavy metals monitoring in seawater is very important as a consequence of their danger potential to aquatic life. Electrochemical technique is a very suitable way to analyze trace elements in a solution. For environmental samples, the popular technique is differential pulse anodic stripping voltammetry (DPASV). In this research, the determination of Cd, Cu, and Pb has been done using DPASV technique. The influence of metal deposition time, linear concentration range, limit of detection, reproducibility, and recovery were observed. The result showed the optimum deposition time for Cd, Cu, and Pb was 300 s, 540 s, and 330 s, respectively. The concentration range was linear at 50 ppb to 1000 ppb, with correlation coefficient 0.9997 for all heavy metals. The limit of detection has closed values, 28.5 ppb for Cd, 29.1 ppb for Cu, and 26.2 ppb for Pb. Measurement of reproducibility and % recovery showed good result. The procedure was successfully applied to the speciation of Cd, Cu, and Pb in samples of seawater around Benoa Port, Bali, Indonesia.
