The development of an optochemical sensor for colorimetric determination of trinitrotoluene (TNT) from aqueous samples is described. The optode film was formed based on the immobilization of trioctylmethylammonium chloride (Aliquat 336) on a triacetylcellulose membrane, which acts as a fixed carrier and anion‐exchanger. When the colorless and transparent optochemical sensor are employed in TNT solution samples, a red‐orange color with maximum absorption wavelength at 530 nm develops in consequence of formation of TNT‐Aliquat 336 ion pair in the sensor membrane. The optical response of this optode is being proportional to concentration of TNT in aqueous solution. Various experimental parameters such as pH, optode composition, response time and reversibility have been studied and optimized. The analytical performance of the optode was evaluated, obtaining a linear response over the range of 1.0 to 16.0 mg/L, a limit of detection of 0.14 mg/L, good reproducibility and selectivity. The sensor was seen to exhibit a fully reversible response. The developed optode in the present work was applied to the determination of TNT in water and soil samples with satisfactory results.

中文翻译：

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基于三乙酰纤维素聚合物的光化学传感器的比色法测定三硝基甲苯

描述了用于比色测定含水样品中三硝基甲苯（TNT）的光化学传感器的开发。基于三辛基甲基氯化铵（Aliquat 336）固定在三乙酰纤维素膜上形成的光致发光膜，该膜充当固定载体和阴离子交换剂。当在TNT溶液样品中使用无色透明的光化学传感器时，由于在传感器膜中形成了TNT-Aliquat 336离子对，因此产生了最大吸收波长为530 nm的红橙色。该光电二极管的光学响应与水溶液中TNT的浓度成正比。已经研究和优化了各种实验参数，例如pH，光电二极管组成，响应时间和可逆性。评估了光电二极管的分析性能，获得1.0至16.0 mg / L范围内的线性响应，0.14 mg / L的检出限，良好的重现性和选择性。看到该传感器表现出完全可逆的响应。本工作中开发的光电二极管用于水和土壤样品中TNT的测定，结果令人满意。