Determination of thiabendazole in aqueous solutions using a cucurbituril-enhanced fluorescence method
Determination of thiabendazole in aqueous solutions using a cucurbituril-enhanced fluorescence method
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葫芦脲增强荧光法测定水溶液中噻菌灵
DOI：
10.1007/s10847-011-9999-1
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发表时间：
2012-04-01
影响因子：
2.3
通讯作者：
Tang, Qing
中科院分区：
文献类型：
--
作者：
Huang, Ying;Wang, Juan;Tang, Qing
用紫外-可见光谱和荧光分光光度法研究了噻菌灵(TBZ)与葫芦[6]脲(Q[6])、葫芦[7]脲(Q[7])和对称四甲基葫芦[6]脲(TMeQ[6])在水溶液中的络合作用。实验结果表明，在pH值为6.5的条件下，三种大环主体均形成1：1的主客体包合物，紫外法和荧光法测得Q[6]-TbZ体系的生成常数分别为(5.37+/-A1.05)×10(4)L(-1)和(1.47+/-A0.41)×10(4)L(-1)(7.76+/-A0.51)×10(4)L(-1)和(9.36+/-A0.22)×10(4)L(-1)-TMeQ[6]-TbZ体系(1.28+/-A0.78)×10(4)L摩尔(-1)和(2.69+/-A0.55)×10(4)L摩尔(-1)，分别进行了分析。基于在中性介质中加入Q[n]S可增强四甲基偶氮唑盐的荧光强度，建立了在Q[n]存在下测定水溶液中四甲基偶氮唑蓝的荧光分析方法。在6×10~(-8)mol L-1~8.0×10~(-6)mol L~(-1)范围内，荧光强度与四丁基肼浓度呈良好的线性关系。检出限为5.51~8.85×10~(-9)mol·L~(-1)。共存离子的干扰很小。该方法已成功地用于不同水溶液中对苯二酚的测定，加标回收率为92-103%。该方法适用于环境水的分析。
The complexation of thiabendazole (TBZ) with the cucurbit[6]uril (Q[6]), cucurbit[7]uril (Q[7]) and symmetric tetramethyl-cucurbit[6]uril (TMeQ[6]) in aqueous solution has been investigated using UV-vis and fluorespectrometry. The experimental results show 1:1 host-guest inclusion complexes at pH 6.5 for all three macrocyclic hosts, and the corresponding formation constants by UV and fluorescence methods are (5.37 +/- A 1.05) x 10(4) L mol(-1) and (1.47 +/- A 0.41) x 10(4) L mol(-1) for the Q[6]-TBZ system (7.76 +/- A 0.51) x 10(4) L mol(-1) and (9.36 +/- A 0.22) x 10(4) L mol(-1) for the Q[7]-TBZ system (1.28 +/- A 0.78) x 10(4) L mol(-1) and (2.69 +/- A 0.55) x 10(4) L mol(-1) for the TMeQ[6]-TBZ system, respectively. Based on the enhancement of the fluorescence intensity of TBZ with the addition of Q[n]s in neutral media, a fluorespectrometry method for the determination of TBZ in aqueous solution in the presence of Q[n] was established. In the range of 6.0 x 10(-8) mol L-1-8.0 x 10(-6) mol L-1 a linear relationship was obtained between fluorescence intensity and TBZ concentration. The detection limit was found to be between 5.51 and 8.85 x 10(-9) mol L-1. The interference of coexisting ions was found to be slight. The proposed method has been successfully applied to the determination of TBZ in different aqueous solutions with satisfactory recoveries of 92-103%. The method seems to be suitable for environmental water analysis.