基于纳米Ag粒子的表面等离子体共振光谱测定CN^-的研究  

Determination of cyanide on surface plasma resonance spectrum of silver nanoparticles

作　　者：杨生春[1] 唐春[1] 董守安[1] 李品将[1] 

机构地区：[1]昆明贵金属研究所,昆明650221

出　　处：《分析试验室》2005年第1期55-58,共4页Chinese Journal of Analysis Laboratory

基　　金：云南省自然科学基金重点项目资助(2000E0008Z)

摘　　要：利用UV 辐照光化学还原法制备了平均直径为20nm的黄色胶体银溶液,银粒子的表面等离子体共振(SPR)光谱的最大吸收波长位于399nm处,摩尔吸光系数为1.3×104L·mol-1·cm-1。利用Ag粒子与CN-反应的动力学特性,研究了SPR光谱的λMAX吸光与CN-浓度的关系及其影响因素,拟定了检测环境水样中隐色、有毒CN-离子的方法。标准工作曲线的线性相关系数0.9995,测定下限0.05μg/mL,相对标准偏差RSD(%)≤6.1(n=5)。对Ag粒子与CN-反应的机理进行了探讨。In this paper, the yellow colloid silver with an average diameter of 20 nm was prepared by UV-irradiation photochemical method, exhibiting a maximum plasmon absorption peak at 399nm. The molar absorptivity is 1.3×10~4 L·mol^(-1)·cm^(-1). Through utilizing speciality of Ag nanoparticles reacting with cyanide, the relationship between cyanide concentration and λ_(MAX) of the surface plasma resonance spectrum was obtained, and the influence factors and the mechanisms were also discussed, so a method for determination of cyanide in environment water was established. The experimental results showed that the correlation coefficient of linear equation is 0.9995 with a detection limit of 0.05 μg/mL. In analysis of synthetical samples RSD≤6.1 (n=5).

关 键 词：纳米银胶体 光化学制备 光度法 CN^-测定 反应机理 

分 类 号：O657.31[理学—分析化学]