中文摘要：

以金属离子（Pb2＋、Mn2＋）与荧光酮（苯基荧光酮、水杨基荧光酮、邻氯苯基荧光酮）的显色体系为模型,在阳离子表面活性剂十六烷基三甲基溴化铵（CTMAB）的存在下,研究了显色剂荧光酮不同的取代基对碳纳米管协同增效作用的影响。结果表明,碳纳米管作为一种新型增效剂,与荧光酮产生π-π作用,使荧光酮类显色体系的灵敏度得到提高。3种荧光酮的增敏强度为ΔA苯基荧光酮〉ΔA水杨基荧光酮〉ΔA邻氯苯基荧光酮。该文从空间位阻、氢键以及取代基的电子效应等方面进行了机理的探讨。水杨基荧光酮和邻氯苯基荧光酮由于邻位取代基的存在,增加了荧光酮分子与碳纳米管之间π-π作用的空间位阻,导致显色体系的增敏强度较小;与带有—Cl吸电子基团的邻氯苯基荧光酮相比,水杨基荧光酮上的供电子基团—OH可与碳纳米管上的含氧基团形成氢键,由于氢键的作用以及电子效应的不同导致了增敏效应的差异。对体系的实验条件进行优化,得出最佳测锰体系的线性范围为0.04~0.56 mg/L,回归方程为A=0.016＋1.541C（mg/L）,表观摩尔吸光系数ε=9.45×104L/（mol.cm）,r=0.997。利用该体系对自来水中的锰进行了测定,结果令人满意。

英文摘要：

Using the chromogenic systems of metal ions（Pb2＋ or Mn2＋） and three fluorones,e.g.phenylfluorone（PF）,salicylfluorone（SAF） and o-chlorophenyl-phenylfluorone（o-Cl-PF） as the models,respectively,the synergic effects of carbon nanotubes（CNTs） with cationic surfactants cetyltrimethyl ammonium bromide（CTMAB） were studied.The results showed that CNTs,as a novel kind of enhancing agent,increased the sensitivity of all the color systems due to the presence of π-π interaction of CNTs and fluorone.The synergic effects of CNTs on the three fluorone molecules were different and the order was ΔAPFΔASAFΔAo-Cl-PF.To study the enhancing mechanism of this system,the influences of the steric hindrance,hydrogen bonds and electronic effect of substituent were disscussed.Compared with that of PF,the steric hindrances of the π-π interaction between CNTs and fluorones（SAF and o-Cl-PF） with their substituting groups of —OH and —Cl,respectively led to the increased sensitivities（ΔA） of their chromogenic systems were smaller.Compared with that of o-chlorophenyl-PF with an electron withdrawing group —Cl,salicylfluorone with an electron donoating group —OH could form hydrogen bonds with the oxygen group on CNTs,which resulted in ΔASAFΔAo-Cl-PF.The experimental conditions of the analysis system were optimized.Under the optimal conditions,the calibration plot for Mn2＋ was linear over the concentration range of 0.04-0.56 mg/L with a correlation coefficient of 0.997.The apparent molar absorbance coefficient was 9.45×104 L/（mol·cm）.This sensitizing system was successfully applied to determine the content of manganese in tap water.