中文摘要：

针对敌草快用量大及水溶性强,易造成农作物农药残留及水资源污染的现状,提出了以八元瓜环为构筑主体,以染料分子噻唑橙（TO）作为客体,构筑了瓜环—染料超分子荧光探针,通过荧光光谱法来检测敌草快（DQ）。噻唑橙（TO）在水溶液中几乎没有荧光,加入八元瓜环（Q[8]）后使TO的荧光增强,形成2∶2的稳定复合物。当在Q[8]/TO荧光探针体系中逐渐加入敌草快之后荧光强度又逐渐降低。根据其光谱变化,表明探针Q[8]/TO对敌草快有分子识别作用,由此建立了以Q[8]/TO荧光探针检测水中的敌草快的新方法。实验结果表明其在0-3μmol/L范围内线性关系良好,检测限为8.82×10^-9mol/L,其在河水中的回收率可达到105%-106%。

英文摘要：

Thiazole orange can react with cucurbit[8]uril（ Q[8]） to form 2 ∶ 2 host-guest stablecomplexes and the fluorescence intensity of the complexes was greatly enhanced. But the dramatic quenching of the fluorescence intensity of Q[8]/ TO complexes was observed with the addition of diquat（ DQ）. So a new method based on fluorescence quenching of the fluorescent host-guest complexes of Q[8]-TO（ the probe） upon cooperative binding with DQ to form a ternary complex,was proposed for the analytical determination of the herbicide in aqueous solutions. A linear correlation（ y = 2. 03＋0. 54 x,R = 0. 999 5） between the fluorescence intensity and concentration of DQ from 0to 3 μmol / L and detection limits of 8. 82×10^-9mol L-1was obtained. Recoveries obtained by the proposed method in real-world examples such as river water were 105% -106%.