The objective of this work was the development of reliable methods to determine 2,4-dinitrotoluene, a precursor to explosives. A complex between Fe(II) ion and 2,4-dinitrotoluene was formed in solution and characterized by ultraviolet-visible absorption spectroscopy using Job’s plots and attenuated total reflection-Fourier transform infrared spectroscopy. Surface modification of glassy carbon electrodes were performed with iron nanoparticles via electrochemical reduction of iron(II). The modified electrode was employed for the determination of 2,4-dinitrotoluene. Scanning electron micrographs showed that the iron nanoparticles were incorporated on the surface of glassy carbon electrode. The electrochemical determination of 2,4-dinitrotoluene was performed by cyclic voltammetry using the modified electrode. The iron modified electrode produced larger reduction currents than the unmodified electrode for the same concentration of 2,4-dinitrotoluene. Concentrations of 2,4-dinitrotoluene as low as 10 parts per billion were determined using the modified electrode.

中文翻译：

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铁 (II) 和 2,4-二硝基甲苯的光谱和电化学表征

这项工作的目的是开发可靠的方法来测定 2,4-二硝基甲苯，一种炸药的前体。Fe(II) 离子和 2,4-二硝基甲苯之间的复合物在溶液中形成，并通过紫外-可见吸收光谱使用乔布斯图和衰减全反射傅里叶变换红外光谱进行表征。玻璃碳电极的表面改性是通过铁（II）的电化学还原用铁纳米颗粒进行的。修饰电极用于测定2,4-二硝基甲苯。扫描电子显微照片显示铁纳米粒子结合在玻碳电极表面。2,4-二硝基甲苯的电化学测定通过循环伏安法使用修饰电极进行。对于相同浓度的 2,4-二硝基甲苯，铁改性电极比未改性电极产生更大的还原电流。使用改良电极测定的 2,4-二硝基甲苯浓度低至十亿分之十。