کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5009096 | 1462039 | 2017 | 7 صفحه PDF | دانلود رایگان |
- We fabricated a thin film polymer kit for trinitrotoluene (TNT) detection.
- A red-brown product was obtained after adding TNT solution into the test kit.
- The quantification of TNT was achieved based on the digital image colorimetry.
- Good accuracy and precision were obtained from control and spiked soil samples.
- The test kit had been applied to detect trace TNT from Bangkok bombing crime scene.
A novel test kit was developed for the selective detection of trinitrotoluene (TNT). A thin film of ethylenediamine (EDA)-entrapped polyvinyl chloride was fabricated within a small tube which made the kit easily portable. A red-brown complex was obtained from a selective reaction of released EDA with TNT. The test kit was used in conjunction with digital image colorimetry for rapid quantitative analysis of TNT. The Red-Green-Blue (RGB) values from digital photos of the colorimetric products were used as the analytical data to establish calibration curves of TNT. A wide linear range (0-100 mgLâ1) with good linearity (R2 > 0.99) and low limit of detection (1.00 ± 0.02 mgLâ1-5.4 ± 0.3 mgLâ1) was obtained for quantification of TNT. Good precision was obtained in both intra- and inter-day tests (2.18-5.59%RSD and 4.00-8.83%RSD, respectively). The method showed good accuracy with control and spiked soil samples: TNT readings were 8.0-12.2 mgLâ1 with 10 mgLâ1 known concentration. The test kit could be stored in both desiccator and freezer for 2 months (only + 0.6% and + 5.0% change in the blue channel intensity). The test kit was able to detect trace residues of TNT from an actual bombing crime scene (Ratchaprasong intersection, Bangkok) one week after the bombing.
Journal: Sensors and Actuators B: Chemical - Volume 252, November 2017, Pages 463-469