The selective determination of radioactive I over organic iodides is beneficial for the efficient treatment of spent fuel and nuclear emergency. We herein develop an efficient strategy for trace I selective detection over organic iodide for the first time by using electrochemiluminescence (ECL) device. In detail, an I selective sensor is prepared by Au nanoparticles and dsDNA with -NH group, and then modified on indium tin oxide (ITO) electrode to obtain I detection device. -NH acts as ECL co-reactant as well as I selective response group, which can specifically combine with I in organic iodide atmosphere to quench the signal of ECL emitter (Ru(bpy)). This device gives a low limit of detection (5 ng/L) and high selectivity to I under high humidity, acidity, temperature as well as CHI atmosphere. ECL imaging technology is applied to realize visualized accurate monitoring to trace I in atmosphere. Electrochemical measurement and theory calculation are further employed to demonstrate the selective mechanism of I detection over organic iodides. This work provides an efficient strategy and device for trace I specific monitoring, which exhibits a promising prospect in the fields of environment and nuclear energy.

中文翻译：

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使用基于 NH2-DNA 的电化学发光装置对有机碘化物中的痕量放射性 I2 进行高选择性监测

放射性I相对于有机碘化物的选择性测定有利于乏燃料和核应急的有效处理。我们首次利用电化学发光（ECL）装置开发了一种有效的策略，用于对有机碘化物进行痕量 I 选择性检测。具体来说，由Au纳米颗粒和带有-NH基团的双链DNA制备I选择性传感器，然后在氧化铟锡（ITO）电极上修饰以获得I检测装置。-NH作为ECL共反应物以及I选择性响应基团，可以与有机碘化物气氛中的I特异性结合，猝灭ECL发射体(Ru(bpy))的信号。该装置在高湿度、酸度、温度以及 CHI 气氛下具有低检测限 (5 ng/L) 和对 I 的高选择性。应用ECL成像技术，实现对大气中痕量I的可视化精确监测。进一步采用电化学测量和理论计算来证明 I 检测对有机碘化物的选择性机制。该工作为痕量I特异性监测提供了一种有效的策略和装置，在环境和核能领域展现出广阔的前景。