Honeychurch Kevin C, Hawkins Daniel M, Hart John P, Cowell David C
Centre for Research in Analytical, Materials and Sensors Science, Faculty of Applied Sciences, University of the West of England, Bristol, Frenchay Campus, Coldharbour Lane, Bristol BS16 1QY, UK.
Talanta. 2002 May 24;57(3):565-74. doi: 10.1016/s0039-9140(02)00060-7.
Screen-printed carbon electrodes (SPCEs), without chemical modification, have been investigated as disposable sensors for the measurement of trace levels of Cu(2+). Cyclic voltammetry was employed to elucidate the electrochemical behaviour of Cu(2+) at these electrodes in a variety of supporting electrolytes. For all of the electrolytes studied the anodic peaks, obtained on the reverse scans, showed that the Cu(2+) had been deposited as a thin layer on the surface of the SPCE. The anodic peak of greatest magnitude was obtained in 0.1 M malonic acid. The possibility of determining Cu(2+) at trace levels using this medium was examined by differential pulse anodic stripping voltammetry (DPASV). The effect of Bi(3+), Cd(2+), Fe(3+), Hg(2)(2+), Pb(2+), Sb(3+) and Zn(2+) on the Cu stripping peak was examined and under the conditions employed, only Hg(2)(2+) was found to significantly effect the response gained. The sensors were evaluated by carrying out Cu(2+) determinations on spiked and unspiked serum and water samples. The mean recovery was found in all cases to be >90% and the performance characteristics indicated the method holds promise for trace Cu(2+) levels by employment of Hg-free SPCEs using DPASV.
未经化学修饰的丝网印刷碳电极（SPCEs）已被研究用作测量痕量铜离子（Cu(2+)）的一次性传感器。采用循环伏安法来阐明在各种支持电解质中Cu(2+)在这些电极上的电化学行为。对于所有研究的电解质，在反向扫描中获得的阳极峰表明Cu(2+)已作为薄层沉积在SPCE表面。在0.1 M丙二酸中获得了最大幅度的阳极峰。通过差分脉冲阳极溶出伏安法（DPASV）研究了使用这种介质测定痕量Cu(2+)的可能性。研究了铋离子（Bi(3+)）、镉离子（Cd(2+)）、铁离子（Fe(3+)）、汞离子（Hg(2)(2+)）、铅离子（Pb(2+)）、锑离子（Sb(3+)）和锌离子（Zn(2+)）对铜溶出峰的影响，在所采用的条件下，发现只有Hg(2)(2+)对获得的响应有显著影响。通过对加标和未加标血清及水样进行Cu(2+)测定来评估这些传感器。在所有情况下，平均回收率均>90%，性能特征表明该方法通过使用无汞SPCEs和DPASV对痕量Cu(2+)水平测定具有前景。
