巯基硅烷纳米薄膜修饰金电极测定痕量汞(Ⅱ)  

Thiolated Nano Film Modified Au Electrode for Determination of Trace Mercury(Ⅱ)

作　　者：肖健林[1] 刘建允[1] 张鑫[1] 廖金金[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《分析科学学报》2014年第1期35-38,共4页Journal of Analytical Science

基　　金：国家自然科学基金(No.21105009);电分析化学国家重点实验室开放课题(No.SKLEAC201205)

摘　　要：采用3-巯丙基三甲氧基硅烷（MPTS）为单一硅源合成有机硅纳米材料，将其组装到金电极表面，制备MPTS薄膜修饰电极。采用原子力显微镜和透射电镜表征有机硅纳米，粒径为3．3～5．7nm；采用方波溶出伏安法测定该修饰电极对汞的响应信号。结果表明，该修饰电极对痕量汞有高灵敏响应。在0．1mol／LHCl中，于-0．4V电位下富集10min，溶出峰电流与其浓度在1．5×10-12～75．0×10-12mol／L范围内呈线性关系，相关系数为0．9980，检出限为5．0×10-13mol／L。该方法用于实际水样中汞的测定，与原子荧光光谱法进行比较，结果基本一致。The organosilica nanomaterial was synthesized using （3-mercaptopropyl）-trimethoxysilane （MPTS） as a single silica source and the MPTS modified Au electrode was obtained by self-assembling. The organosilica particle size was about 3.3-5. 7 nm as measured by transmission electron microscope （TEM） and atomic force microscope（AFM）. Mercury（ Ⅱ ） stripping peak signal was investigated by square wave stripping voltammetry （SWV）. The results showed that the modified electrode had a sensitive response to trace mercury （Ⅱ）. Under the optimal experimental conditions, the linear relationship between peak current and mercury（ Ⅱ ） concentration was achieved in range of 1.5 ×10-12 - 75.0 × 10-12 mol/L with 10 min preconcentration at - 0. 4 V in the 0. 1 mol/L hydrochloric acid solution. The detection limit was 5.0 × 10-13 mol/L. The prepared sensor was successfully applied for the determination of mercury（ Ⅱ） in tap water and lake water, and the results were consistent with those obtained by atomic fluorescence spectrometry（AFS）.

关 键 词：3-巯丙基三甲氧基硅烷 方波溶出伏安法 汞 

分 类 号：O657.1[理学—分析化学]