Journal
FORENSIC SCIENCE INTERNATIONAL
Volume 222, Issue 1-3, Pages 340-345Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.forsciint.2012.07.014
Keywords
Digital images; RGB color system; Nessler's test; 2,4,6-Trinitrotoluene
Categories
Funding
- TRF-CHE grant [MRG5480125]
- Thailand Research Fund
- Commission on Higher Education
- Faculty of Science
- Prince of Songkla University
- Trace Analysis and Biosensor Research Center (TAB-RC)
- Center for Innovation in Chemistry (PERCH-CIC)
- Higher Education Research Promotion and National Research University Project of Thailand
- Commission of Higher Education
- Royal Thai Government
- Centre for Forensic Science, Department of Pure and Applied Chemistry, University of Strathclyde
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A rapid quantitative colourimetric test was developed for the determination of 2,4,6-Trinitrotoluene (TNT) in soil. Quantification was achieved using an innovative application of photography where the relationship between the Red Green Blue (RGB) value and concentration of colorimetric product was exploited. The wide linear range (1-50 mg/L) and low detection limit (0.73 +/- 0.01 mg/L to 3.5 +/- 0.4 mg/L) achieved was comparable with spectrophotometric quantification methods. Quantification was validated both with known concentration standards and spiked soil extracts confirming the accuracy of the technique. The results demonstrate a powerful technique with the capacity for development as a rapid on site field test for the analysis of explosives. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
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