摘要
用共振瑞利散射(RRS)光谱研究F-,Cl-,Br-,I-与5种季铵盐型阳离子表面活性剂(CS+)的相互作用,发现仅有离子半径较大的I-与CS+反应能引起RRS的明显增强并出现新的RRS光谱,同时也能引起紫外吸收光谱的变化,但疏水链较短的十四烷基吡啶不反应,而且当碳链相同时,RRS强度从大到小依次为:二甲基苄基铵盐、吡啶钅翁盐、三甲基铵盐.反应宜在碱性介质中进行,最大RRS波长均位于278nm处,在一定范围内ΔIRRS值与CS+的浓度成正比.对不同的CS+,其检出限在22 60～46 74ng/mL之间.其中以十六烷基二甲基苄基氯化铵(BCDAC)的灵敏度最高.研究了共存物质的影响及分析应用的可能性,并探讨了RRS增强的原因.
Using Resonance Rayleigh Scattering (RRS) to investigate the interaction of F^-,Cl^-,Br^- and I^- with five quaternary ammonium cationic surfactants (CS^+), it is showed that only I^-, with larger ionic radius, can produce significant RRS enhancements, present new RRS spectra and induce new absorbance spectra. However, tetradecane pyridinium bromide (TPB) whose hydrophobe part is short cannot interact with I^-. When the alkyl of CS^+ is the same, the RRS intensity follows benzyl-dimethyl-ammonium, pyridinium, trimethylammonium. The maximum RRS peak is located at 278 nm and the interaction is suitable to basic medium. The intensity of ΔI_(RRS) is directly proportional to the concentration of CS^+. Their detection limits are between 22.60-46.74 ng/mL depending on different CS^+. Among these cationic surfactants, benzyl-dimethyl-hexadecylammonium-chloride (BCDAC) presents the highest sensitivity. The influence of coexisting substances, the possibility of analytical application and the reasons for the enhancement of RRS have been discussed.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期84-89,共6页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(29875019
20175018).
