(阳离子表面活性剂-I_3)n缔合微粒体系的光谱特性及分析应用  

Spectral Properties of Cationic Surfactant-I^-_3 Association Particle System and Its Analytical Application

作　　者：程云燕[1] 罗杨合[1] 蒋治良[1] 

机构地区：[1]广西师范大学资源与环境学系,广西桂林541004

出　　处：《分析测试技术与仪器》2005年第2期99-102,共4页Analysis and Testing Technology and Instruments

基　　金：广西自然科学基金资助项目(No.014403).

摘　　要：在0.01mol/LHCl介质中,I-3在350nm处有一吸收峰;当十六烷基三甲基溴化铵(CTMAB)与I-3共存时体系呈红紫色,在550nm处产生一新的吸收峰.CTMAB浓度CCTMAB在0.0～7.0×10-5mol/L范围内符合比耳定律,回归方程为A550nm=0.989×104CCTMAB+0.0138,相关系数R为0.9995,摩尔吸光系数ε为1.06×104L/(mol·cm),据此建立了一种测定阳离子表面活性剂含量的分光光度新方法,并用于合成样品和新洁尔净样品中阳离子表面活性剂测定.共振散射光谱研究表明,CTMAB+与I-3可通过静电引力作用形成疏水性的CTMA-I3缔合物分子,并进一步聚集形成稳定的(CTMA-I3)n缔合微粒.由于该缔合微粒在580nm处产生共振散射效应,故体系呈红紫色.In 0.01 mol/L HCl medium, there is a max absorption peak at 350 nm for I^-_3. The association particle system of (CTMAB-I_3)_n is in violet-red color. It has a new absorption peak at 550 nm. The CTMAB concentration C_(CTMAB) in the range of 0.0~7.0×10^(-5) mol/L is linear to the A_(550 nm) value. Its regression equation is A_(550 nm)=0.989×10~4 C_(CTMAB)+0.0138,regression coefficient is 0.9995. The mole absorption coefficient is 1.06×10~4 L/(mol·cm). A new spectrophotometric method has been proposed for the determination of cationic surfactant. The resonance scattering spectra show that the CTMAB^+ and I^-_3 combine to CTMA-I_3 association molecule by means of attract forces. The association molecules automatically aggregate to (I_3-CTMA)_n association particles. So that, the particles exhibit a resonance scattering peaks at 580 nm, and the system is in violet\|red.

关 键 词：阳离子表面活性剂 缔合微粒 分光光度法 共振散射 

分 类 号：O657.61[理学—分析化学]