A simple colorimetric detection method for 2,4,6-trinitrotoluene (TNT) in contaminated soil has been developed. Procedurally, a TNT responsive chromogenic reagent was inkjet printed on commercially available photo paper, and the resulting colorimetric ticket was laminated with a precut patterned film to make a bilayer microfluidic sensor. For the TNT detection experiments, a drop of TNT solution was placed on the center of the prepared sensor. Color measurement of the sensor with a photo scanner showed a wide detection range of TNT, ranging from 14 parts per million (ppm), which is below its residential screening level (∼21 ppm) to 7,200 ppm. To further demonstrate its efficacy, TNT spiked soil samples were extracted with acetone and evaluated with the developed sensor.

中文翻译：

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用于污染土壤中 TNT 检测的喷墨打印低成本比色票

已开发出一种简单的比色检测方法来检测受污染土壤中的 2,4,6-三硝基甲苯 (TNT)。在程序上，将 TNT 响应显色试剂喷墨打印在市售相纸上，并将所得比色票与预切图案薄膜层压以制成双层微流体传感器。对于 TNT 检测实验，将一滴 TNT 溶液放在准备好的传感器的中心。使用照片扫描仪对传感器进行的颜色测量显示，TNT 的检测范围很广，从百万分之 14 (ppm) 不等，低于其住宅筛选水平 (~21 ppm) 到 7,200 ppm。为了进一步证明其功效，用丙酮提取 TNT 加标土壤样品并用开发的传感器进行评估。