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pH、富集时间等工作条件下,得到2～300μg/L线性范围内的铅标准曲线,检测限为0.46μg/L(S/N=3);其重复性好,连续5次测定后的相对标准偏差为4.59%;本方法与ICP-MS法对茶叶样本的测定结果相近。研究出的快速检测铅的新型电化学传感器具有较好的稳定性、灵敏度和安全性,且测定结果准确,具有一定的应用潜力。
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.
出处
《茶叶科学》
CAS
CSCD
北大核心
2012年第6期485-493,共9页
Journal of Tea Science
基金
国家自然科学基金(No.30571623)
浙江工商大学新苗人才项目[No.3070JQ4111087P(G)]
浙江工商大学研究生科技创新项目(1110XJ1511104)
关键词
羟磷灰石
电化学传感器
快速测定铅
茶叶
hydroxyapatite
electrochemical sensor
rapid determination of trace lead
tea
