基于银纳米微粒-罗丹明6G的SERS法测定痕量钼(Ⅵ)

Determination of Trace Molybdenum(Ⅵ) by SERS Method Based on Silver Nanoparticles-Rhodamine 6G

基于酸性介质的条件下,银纳米粒子(AgNPs)与探针分子Rh6G会产生较强的表面增强拉曼散射(Surface enhanced Raman spectroscope,SERS)效应,当溶液中加入Mo(Ⅵ)时,Rh6G与Mo(Ⅵ)发生络合反应形成一个Rh6G-Mo(Ⅵ)复合物,随着Mo(Ⅵ)浓度的增大,游离的Rh6G减少,使得体系的SERS效应降低,当Mo(Ⅵ)浓度在0.02~0.8μg·mL^(-1)范围内,其ΔI_(1 509cm^(-1))值Mo(Ⅵ)浓度呈良好的线性关系,线性方程为ΔI_(1 509cm^(-1))=542.09c+175.24,线性相关系数为0.995 6,检测限为0.008μg·mL^(-1),据此可建立一种Mo(Ⅵ)-Rh6G-AgNPs体系的SERS分析新方法。

Silver nanoparticles（AgNPs）and the probe molecule Rh6 Ggenerate a strong Surface Enhanced Raman Spectroscope（SERS）effect under the conditions of acidic medium.When Mo（Ⅵ）is added to the solution,Rh6 Gcomplexes with Mo（Ⅵ）to form a Rh6 G-Mo（Ⅵ）Complex.With the increase of Mo（Ⅵ）concentration and the free Rh6 Gdecreases,the SERS signal of the system weakened.Accordingly,a SERS quantitative analysis methodfor Mo（Ⅵ）was established,with a linear range of 0.020.8μg·mL-1,and a detection limit of 0.008μg·mL-1 Mo（Ⅵ）.