摘要
采用荧光光谱法探讨了β-环糊精（pCD）与农药氯氰菊酯间的超分子相互作用。研究结果表明，β-环糊精与氯氰菊酯可形成1：1的超分子包合物，其包合常数为37L／mol。包合物在λex／λem=328／368nm处发射强荧光，据此建立了测定氯氰菊酯的荧光分析方法。本法荧光强度与氯氰菊酯浓度在0．04～0．2μg／mL范围内，呈良好的线性关系，相关系数r=0．9996，检出限为0．024μg／mL。该体系的抗干扰能力及稳定性好。对实际样品进行了分析，结果满意。
The supramolecular interaction between cypermethrin and β-cyclodextrin was studied by spectrofluorimetry. The results show that β-cyclodextrin reacts with eypermethrin to form an inclusion complex with an association constant of 37 L/mol. The composition of the complex is 1： 1（β-CD： eypermethrin）. Based on the significant enhancement of fluorescence intensity of eypermethrin in inclusion complex,a spectrofluorimetric method with high sensitivity and selectivity was developed for the determination of cypermethrin in aqueous solution. Under the optimum condition, the complex had maximum excitation and emission wavelengths at 328 nm and 368 nm, respectively. The linear range of the method was from 0. 04 μg/mL to 0. 2 μg/mL with a detection limit of 0. 024μg/mL. The recoveries of cypermethrin were 94.2 %-105.1%.
出处
《分析科学学报》
CAS
CSCD
2007年第5期592-594,共3页
Journal of Analytical Science
关键词
氯氰菊酯
Β-环糊精
荧光分析法
超分子包合物
Cypermethrin
β-cyclodextrin
Supramolecular
Interaction
Spectrofluorimetry
