TY - JOUR
T1 - Mutual interferences in the determination of Zn(II) and Cu(II) in seawater by anodic stripping voltammetry
AU - Lazar, Boaz
AU - Nishri, Ami
AU - Ben-Yaakov, Sam
N1 - Funding Information:
The authors gratefully acknowledge financial support provided by the Committee on Planning and Budgeting, the Council for Higher Education. Additional funds were made available by the Ben-Gurion University of the Negev.
PY - 1981/8/25
Y1 - 1981/8/25
N2 - Cu(II) and Zn(II) titration experiments were used to investigate the mutual interference of Zn and Cu in anodic stripping voltammetry (ASV) at the stationary, mercury-coated, glassy carbon electrode. The experiments were conducted on stored seawater with a trace metal concentration range of 10-8-10-7 M. It was found that both Zn(II) and Cu(II) titration curves show a characteristic beeak point, the position of which is a function of the concentration of the interfering ion. The mutual interference is attributed to the formation of an intermetallic compound (IC) with a stoichiometric formula ZnCu. The model further assumes that the rate of Zn oxidation off the amalgam is the kinetic-limiting step in the IC dissociation during the stripping cycle of the ASV analysis. Numerical simulation of the titration experiments-using the proposed model and applying experimentally derived parameters-is in good agreement with the experimental results. The model can thus be applied to correct for Zn and Cu interference in ASV.
AB - Cu(II) and Zn(II) titration experiments were used to investigate the mutual interference of Zn and Cu in anodic stripping voltammetry (ASV) at the stationary, mercury-coated, glassy carbon electrode. The experiments were conducted on stored seawater with a trace metal concentration range of 10-8-10-7 M. It was found that both Zn(II) and Cu(II) titration curves show a characteristic beeak point, the position of which is a function of the concentration of the interfering ion. The mutual interference is attributed to the formation of an intermetallic compound (IC) with a stoichiometric formula ZnCu. The model further assumes that the rate of Zn oxidation off the amalgam is the kinetic-limiting step in the IC dissociation during the stripping cycle of the ASV analysis. Numerical simulation of the titration experiments-using the proposed model and applying experimentally derived parameters-is in good agreement with the experimental results. The model can thus be applied to correct for Zn and Cu interference in ASV.
UR - http://www.scopus.com/inward/record.url?scp=0141592082&partnerID=8YFLogxK
U2 - 10.1016/S0022-0728(81)80348-8
DO - 10.1016/S0022-0728(81)80348-8
M3 - Article
AN - SCOPUS:0141592082
SN - 0022-0728
VL - 125
SP - 295
EP - 306
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 2
ER -