重氮偶合表面增强拉曼光谱快速分析椰汁中西维因  

Rapid Detection of Carbaryl in Coconut Juice by Diazotization-Coupling Reaction Combined with Surface-enhanced Raman Spectroscopy

作　　者：陈漾[1] 张凯歌[1] 胡玉玲[1] 李攻科[1] 

机构地区：[1]中山大学化学与化学工程学院,广东广州510275

出　　处：《分析测试学报》2014年第4期432-436,共5页Journal of Instrumental Analysis

基　　金：国家重大科学仪器设备开发专项(2011YQ03012409);国家自然科学基金项目(21277176;21275168;21127008)

摘　　要：基于水解西维因/重氮偶合反应生成具有拉曼增强信号偶氮化合物的方法,以具有核壳结构的Au@SiO2纳米颗粒（由约55 nm的Au核和约1～2 nm的SiO2壳层组成）为增强基底,建立了偶氮化合物间接测定西维因含量的新方法,并对反应条件和测试方法进行了优化.在优化条件下,方法的线性范围为5.0～100.0 mg/L,检出限为1.7 mg/L.方法应用于椰汁中西维因的检测,回收率为100.4％ ～ 105.1％,相对标准偏差（RSD）为2.8％～4.9％.该方法简便快速、成本低、样品用量少,可实现现场的快速检测.In this paper, the hydrolysis of carbaryl was combined with the diazotization-coupling re- action to produce the azoic compounds, which have strong surface-enhanced Raman scattering （SERS） effect. Based on the principle, a novel method for the determination of carbaryl was estab- lished using shell-isolated Au@ SiOz nanoparticles as SERS substrates which consist of Au nanoparti- cle cores with a diameter of about 55 nm and the silica shell with its thickness about 1 -2 nm. The conditions of the reaction and the method of the detection were optimized. Under the optimal condi- tions, the linearity was observed in the range of 5.0 - 100. 0 mg/L with a limit of detection of 1.7 mg/L at 1 218 cm-1. The method was applied in the analysis of carbaryl in coconut juice with recov- eries of 100. 4% -105.1% and relative standard deviations （RSDs） of 2. 8% -4. 9%. The results indicated that this proposed method was simple, rapid, low-cost and low-consuming. The proposed method was applicable for in situ detection of carbaryl in real samples.

关 键 词：重氮偶合反应 表面增强拉曼光谱 快速分析 椰汁 西维因 

分 类 号：O657.3[理学—分析化学] F767.2[理学—化学]