Using the iPhone as a device for a rapid quantitative analysis of trinitrotoluene in soil

Choodum, Aree; Kanatharana, Proespichaya; Wongniramaikul, Worawit; Daéid, Niamh Nic

doi:10.1016/j.talanta.2013.04.037

Cited by 105 publications

(68 citation statements)

References 18 publications

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“…Four post-blast soil samples were prepared using the same procedure as in previous studies [30][31][32]. Briefly, a 1 gram soil sample was extracted using 5mL of acetone before being sonicated for 10 minutes and filtered using Whatman No.1.…”

Section: Colour Test Of Tnt In Soil Samplementioning

confidence: 99%

A cost effective hydrogel test kit for pre and post blast trinitrotoluene

Choodum

Malathong

NicDaéid

et al. 2016

Forensic Science International

Self Cite

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General rightsCopyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain.• You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACTA cost effective hydrogel test kit was successfully developed for the detection of pre-and post-blast trinitrotoluene (TNT). A polyvinyl alcohol (PVA) hydrogel matrix was used to entrap the potassium hydroxide (KOH) colourimetric reagent. The easily portable test kit was fabricated in-situ in a small tube to which the sample could be added directly. The test kit was used in conjunction with digital image colourimetry (DIC) to demonstrate the rapid quantitative analysis of TNT in a test soil sample. The built-in digital camera of an iPhone was used to capture digital images of the colourimetric products from the test kit. Red-Green-Blue (RGB) colour data from the digital images of TNT standard solutions were used to establish a calibration graph. The validation of the DIC method indicated excellent inter day precision (0.12-3.60%RSD) and accuracy (93-108% relative accuracy). Post-blast soil samples containing TNT were analysed using the test kit and were in good agreement with spectrophotometric analysis. The intensity of the RGB data from the TNT complex deviated by +6.3%, +5.1%, and -4.9% after storage of the test kits in a freezer for 3 months. The test kit was also reusable for up to 12 times with only -5.4%, +0.3%, and +4.0% deviations. The hydrogel test kit was applied in the detection of trace explosive residues at the scene of the recent Bangkok bombing at the Ratchaprasong intersection and produced positive results for TNT demonstrating its operational field application as a rapid and cost effective quantitative tool for explosive residue analysis.

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Section: Colour Test Of Tnt In Soil Samplementioning

confidence: 99%

A cost effective hydrogel test kit for pre and post blast trinitrotoluene

Choodum

Malathong

NicDaéid

et al. 2016

Forensic Science International

Self Cite

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show abstract

“…Small analytes and molecules have also been detected using cellphone platforms as valuable analytic measurement tools [96][97][98][99]. …”

Section: Sensing Of Small Analytes and Moleculesmentioning

confidence: 99%

Cellphone-based diagnostic devices

Huang¹,

Cheng²

2017

Point-of-Care Diagnostics - New Progresses and Perspectives

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“…Images were captured by the camera in the device after the colourimetric test, and calibration curves between the RGB values and the concentration of the colourimetric product were obtained, with acceptable relative errors (RSDs between 0.4% and 6.3%) and good precision (RSDs between 2.09% and 7.43%). [53] In addition, fluorescent sensors seem to be promising devices for the detection of nitroaromatic explosives. Y. Gong et al created a thriphenylene-2,6,10-tricarboxylate and Tb 3+ building block to perform the selective sensing of TNT, TNP, 2,4-DNT, 2,6-DNT and nitrobenzene (NB).…”

Section: Comparison Of Ce With Other Emerging Techniquesmentioning

confidence: 99%