Determination of trace arsenic on hanging copper amalgam drop electrode.
Hanging copper amalgam drop electrode has been applied for trace determination of arsenic by cathodic stripping analysis. Detection limit for As(III) as low as 0.33nM (0.02mug/L) at deposition time (240s) could be obtained. For seven successive determinations of As(III) at concentration of 5nM relative standard deviation was 2.5% (n=7). Interferences from selected metals and surfactant substances were examined. Absence of copper ions in sample solution causes easier optimization and makes method less vulnerable on contamination. The developed method was validated by analysis of certified reference materials (CRMs) and applied to arsenic determinations in natural water samples.
Piech
Robert
R
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30-059 Krakow, Poland.
Baś
Bogusław
B
Niewiara
Ewa
E
Kubiak
Władysław W
WW