Centre for Research in Biomedicine, Faculty of Health & Life Sciences, University of the West of England, Frenchay Campus, Coldharbour Lane, Bristol, BS16 1QY, UK.
Talanta. 2011 May 15;84(3):717-23. doi: 10.1016/j.talanta.2011.01.073. Epub 2011 Feb 4.
Microband screen-printed carbon electrodes (μBSPCEs) without further modification have been investigated as disposable sensors for the measurement of lead in acetate leachates from ceramic glazed plates. Cyclic voltammetry was employed to elucidate the electrochemical behaviour of Pb(2+) at these electrodes in a variety of supporting electrolytes. The anodic peaks obtained on the reverse scans, showed that Pb had been deposited as a thin layer on the surface of the μBSPCE. The anodic peak of greatest magnitude was obtained in 0.1M pH 4.1 acetate buffer containing 13 mM Cl(-). The effect of chromium, copper, phosphate, sulphate and tin was examined and under the conditions employed, no significant change in current was found. The μBSPCEs were evaluated by carrying out lead determinations for acetate leachates from glazed ceramic plates. A highly decorated ornamental plate was found to leach 400 μg Pb(2+) (%CV=1.91%). A second plate, designed for dinnerware was found not to leach any detectable levels of Pb(2+). However, once fortified with 2.10 μg of Pb (equivalent to 100 ng/ml in the leachate), a mean recovery of 82.08% (%CV=4.07%) was obtained. The performance characteristics indicate that reliable data has been obtained for this application which could identify potentially toxic sources of lead.
微带丝网印刷碳电极（μBSPCEs）无需进一步修饰，已被研究作为测量陶瓷釉面盘中醋酸盐浸出液中铅的一次性传感器。循环伏安法被用于研究在各种支持电解质中 Pb(2+)在这些电极上的电化学行为。反向扫描得到的阳极峰表明 Pb 已作为薄层沉积在 μBSPCE 的表面上。在含有 13 mM Cl(-)的 0.1M pH 4.1 醋酸盐缓冲液中获得了最大幅度的阳极峰。考察了铬、铜、磷酸盐、硫酸盐和锡的影响，在采用的条件下，电流没有明显变化。通过对釉面陶瓷盘中醋酸盐浸出液中的铅进行测定，对 μBSPCEs 进行了评估。一个高度装饰的装饰盘被发现浸出了 400μg Pb(2+)（%CV=1.91%）。第二个用于餐具的盘子没有发现可检测到的 Pb(2+)浸出。然而，一旦用 2.10μg Pb（相当于浸出液中的 100ng/ml）强化，就可以获得 82.08%（%CV=4.07%）的平均回收率。性能特征表明，已经为这种应用获得了可靠的数据，这种数据可以识别潜在的有毒铅源。
