羟磷灰石/SDBS丝网印刷碳电极快速测定茶叶痕量铅

摘要:为改善快速测定铅电化学传感器的稳定性、灵敏度和安全性,本研究利用SDBS(十二烷基苯磺酸钠)分散羟磷灰石替代惯用的有毒汞修饰丝网印刷碳电极,并滴加Nafion膜增加稳定性,构建了一种快速测定痕量铅的新型电化学传感器.采用方波溶出伏安法,支持电解质为0.1 mol/L HAc-NaAc,在优化的羟磷灰石量、测试底液...

Hydroxyapatite/SDBS Modified Screen-printed Carbon Electrodes for the Rapid Determination of Trace Lead in Tea

In order to improve the stability,sensitivity and safety of the electrochemical sensor for rapid determination of lead,the usual toxic mercury with screen-printed carbon electrode was replaced by the hydroxyapatite dispersed by SDBS,with added Nafion membrane to increase stability,so to establish a new electrochemical sensor for rapid determination of trace lead.The analysis was performed by square-wave stripping voltammetry,Sodium acetate buffer(0.1 mol/L) was employed as the supporting electrolyte.Under the optimized working conditions,including amount of hydroxyapatite,pH of solution,accumulation time,a linear response range from 2 μg/L to 300 μg/L was obtained,the detection limit for lead determination was 0.460 μg/L(S/N) =3.The sensor presented good repeatability,evaluated in terms of relative standard deviation(R.S.D.=4.59%).The result determined by this method was similar to ICP-MS method.The novel electrochemical sensor for rapid detection of lead effectively improved the sensitivity,stability and security.In addition,it had accurate results and possessed a certain application potential.