Adsorptive Stripping Analysis of Trace Nickel at Iridium-Based Ultramicroelectrode Arrays
Joseph Wang* Jianyan Wang, and William K. Adeniyi+
Department of Chemistry and Biochemistry, New Mexico State University,
Las Cruces, NM 88003, USA
Samuel P. Kounaves*
Department of Chemistry, Tufts University, Medford, MA 02155, USA
*Authors to whom correspondence
should be addressed.
+Permanent address: Department of Chemistry, North Carolina
Agricultural and Technical State University, Greensboro, NC 27411, USA
Lithographically-fabricated iridium-based mercury microelectrode arrays
are shown to be very suitable for adsorptive stripping measurements of
trace nickel in the presence of the dimethylgloxime complexing agent. Variables
affecting the response have been assessed and optimized. The sensor optimization
has resulted in a favorable and highly stable response, with good linearity
and precision (RSD=1.7%), and a low detection limit (0.5 mg/l
with 30 sec adsorption). Such adsorptive stripping performance makes the
iridium-based microelectrode array very attractive for on-site measurements
of trace metals that cannot be plated electrolytically.