Sensitive determination of environmentally hazardous dihydroxybenzene isomers (DHBIs) by both simultaneously and selectively using the 3,5-diamino-1,2,4-triazole-COvalent organic framework (DAT-COF) film modified glassy carbon electrode (GCE/DAT-COF) was described. The DAT-COF was synthesized by refluxing DAT and terephthalaldehyde in DMF. It was then modified on GCE by potentiodynamic method in the presence of dispersed DAT-COF. The formed DAT-COF film was confirmed by XPS, SEM and cyclic voltammetry. The SEM study revealed that the electrodeposition of DAT-COF on GC substrate leads to the formation of agglomerated structure. The electrochemical impedance studies show that the electron transfer rate constant of [Fe(CN)₆]^3−/4− couple at GCE/DAT-COF was higher than bare GCE. The GCE/DAT-COF was then successfully used to resolve the voltammetric signals of DHBIs, hydroquinone (HQ), catechol (CC) and resorcinol (RC) in a mixture whereas bare GCE failed to separate them. The modified electrode was successfully used to determine the three isomers from 0.20 to 500 µM and the LOD was found to be 0.13, 0.07 and 0.08 µM for HQ, CC and RC (S/N = 3), respectively. The selective determination of one isomer containing the other two isomers and also in the presence of possible other interferences including nitro compounds were achieved. Finally, the three isomers were successfully determined in different water samples.

同时使用3,5-二氨基-1,2,4-三唑-CO价有机骨架（DAT-COF）膜修饰玻碳电极（GCE / DAT-COF）同时选择性地灵敏测定对环境有害的二羟基苯异构体（DHBI） ）进行了描述。通过在DMF中回流DAT和对苯二甲醛合成DAT-COF。然后在分散的DAT-COF存在下，通过电位动力学方法在GCE上对其进行修饰。通过XPS，SEM和循环伏安法确认形成的DAT-COF膜。SEM研究表明，DAT-COF在GC基质上的电沉积会导致团聚结构的形成。电化学阻抗研究表明，[Fe（CN）₆ ] ^{3− / 4-}的电子传递速率常数GCE / DAT-COF的夫妇比裸GCE高。然后，将GCE / DAT-COF成功地用于解析混合物中的DHBI，对苯二酚（HQ），邻苯二酚（CC）和间苯二酚（RC）的伏安信号，而裸露的GCE无法分离它们。修饰电极成功地用于测定0.20至500 µM的三种异构体，HQ，CC和RC（S / N = 3）的LOD分别为0.13、0.07和0.08 µM。可以选择性地确定一种包含其他两种异构体的异构体，并且还可以在可能存在其他干扰物（包括硝基化合物）的情况下进行测定。最后，在不同的水样中成功确定了三种异构体。