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Integrating Paper Chromatography with Electrochemical Detection for the Trace Analysis of TNT in Soil.

Ryan P, Zabetakis D, Stenger DA, Trammell SA - Sensors (Basel) (2015)

Bottom Line: The probe is a combination of graphite electrodes, filter paper, with ethylene glycol and choline chloride as the solvent/electrolyte.Square wave chromatovoltammograms show the probes have a sensitivity for TNT of 0.75 nA/ng and a limit of detection of 100 ng.In addition, by taking advantage of the inherent paper chromatography step, TNT can be separated in both time and cathodic peak potential from 4-amino-dinitrotolene co-spotted on the probe or in soil samples with the presence of methyl parathion as a possible interferent.

View Article: PubMed Central - PubMed

Affiliation: Science and Engineering Apprenticeship Program, Naval Research Laboratory, Washington, DC 20375, USA. patrick_ryan_@outlook.com.

ABSTRACT
We report on the development of an electrochemical probe for the trace analysis of 2,4,6-trinitrotoluene (TNT) in soil samples. The probe is a combination of graphite electrodes, filter paper, with ethylene glycol and choline chloride as the solvent/electrolyte. Square wave chromatovoltammograms show the probes have a sensitivity for TNT of 0.75 nA/ng and a limit of detection of 100 ng. In addition, by taking advantage of the inherent paper chromatography step, TNT can be separated in both time and cathodic peak potential from 4-amino-dinitrotolene co-spotted on the probe or in soil samples with the presence of methyl parathion as a possible interferent.

No MeSH data available.


A schematic of our paper-based electrochemical probe.
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sensors-15-17048-f001: A schematic of our paper-based electrochemical probe.

Mentions: Electrochemical measurements were performed using a potentiostat model #440 from CH Instruments. The electrolyte for the electrochemical experiments consisted of a deep eutectic mixture of a 2:1 molar ratio of ethylene glycol and choline chloride [11]. To construct the probe, a horizontally-oriented graphite working electrode, and a vertically-oriented reference electrode were clipped to a 2 × 1 cm strip of Whatman filter paper mounted on a counter electrode formed from a 2.54 × 1 cm gold film on glass. A schematic is shown in Figure 1. Square wave voltammetry was measured from 0 to −1 V vs. Ag/AgCl at 60 Hz with an amplitude of 25 mV. To correct for the sloping background in the square wave voltammograms, a 5 factor polynomial was fit to each voltammogram on each side of the base of the TNT peak by a least-squares minimization routine using Excel Solver and subtracted from each voltammogram.


Integrating Paper Chromatography with Electrochemical Detection for the Trace Analysis of TNT in Soil.

Ryan P, Zabetakis D, Stenger DA, Trammell SA - Sensors (Basel) (2015)

A schematic of our paper-based electrochemical probe.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541921&req=5

sensors-15-17048-f001: A schematic of our paper-based electrochemical probe.
Mentions: Electrochemical measurements were performed using a potentiostat model #440 from CH Instruments. The electrolyte for the electrochemical experiments consisted of a deep eutectic mixture of a 2:1 molar ratio of ethylene glycol and choline chloride [11]. To construct the probe, a horizontally-oriented graphite working electrode, and a vertically-oriented reference electrode were clipped to a 2 × 1 cm strip of Whatman filter paper mounted on a counter electrode formed from a 2.54 × 1 cm gold film on glass. A schematic is shown in Figure 1. Square wave voltammetry was measured from 0 to −1 V vs. Ag/AgCl at 60 Hz with an amplitude of 25 mV. To correct for the sloping background in the square wave voltammograms, a 5 factor polynomial was fit to each voltammogram on each side of the base of the TNT peak by a least-squares minimization routine using Excel Solver and subtracted from each voltammogram.

Bottom Line: The probe is a combination of graphite electrodes, filter paper, with ethylene glycol and choline chloride as the solvent/electrolyte.Square wave chromatovoltammograms show the probes have a sensitivity for TNT of 0.75 nA/ng and a limit of detection of 100 ng.In addition, by taking advantage of the inherent paper chromatography step, TNT can be separated in both time and cathodic peak potential from 4-amino-dinitrotolene co-spotted on the probe or in soil samples with the presence of methyl parathion as a possible interferent.

View Article: PubMed Central - PubMed

Affiliation: Science and Engineering Apprenticeship Program, Naval Research Laboratory, Washington, DC 20375, USA. patrick_ryan_@outlook.com.

ABSTRACT
We report on the development of an electrochemical probe for the trace analysis of 2,4,6-trinitrotoluene (TNT) in soil samples. The probe is a combination of graphite electrodes, filter paper, with ethylene glycol and choline chloride as the solvent/electrolyte. Square wave chromatovoltammograms show the probes have a sensitivity for TNT of 0.75 nA/ng and a limit of detection of 100 ng. In addition, by taking advantage of the inherent paper chromatography step, TNT can be separated in both time and cathodic peak potential from 4-amino-dinitrotolene co-spotted on the probe or in soil samples with the presence of methyl parathion as a possible interferent.

No MeSH data available.