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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) Peak maximum in time vs. mass of TNT placed on the paper-probe from 100 to 5000 ng; (B) Current vs. mass of TNT in the linear range of 100 to 1000 ng.
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sensors-15-17048-f003: (A) Peak maximum in time vs. mass of TNT placed on the paper-probe from 100 to 5000 ng; (B) Current vs. mass of TNT in the linear range of 100 to 1000 ng.

Mentions: In Figure 3, the amplitude of the peak at 100 s is plot vs. mass of TNT. The linear range is between 100 to 1000 ng with a sensitivity of 0.75 nA/ng and a limit of detection (LOD) of ~100 ng. The LOD was calculated by 3 times the standard deviation of the lowest concentration measured divided by the slope of the regression curve [18]. Beyond 1000 ng the response of the paper probe begins to saturate. The nature of the saturation most likely is caused by various parameter interactions including the slow diffusion coefficient of the TNT in the ethylene glycol, the mass transport of TNT in the ethylene glycol as it is wicked up to the working electrode and rate of electron transfer at the working electrode.


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) Peak maximum in time vs. mass of TNT placed on the paper-probe from 100 to 5000 ng; (B) Current vs. mass of TNT in the linear range of 100 to 1000 ng.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17048-f003: (A) Peak maximum in time vs. mass of TNT placed on the paper-probe from 100 to 5000 ng; (B) Current vs. mass of TNT in the linear range of 100 to 1000 ng.
Mentions: In Figure 3, the amplitude of the peak at 100 s is plot vs. mass of TNT. The linear range is between 100 to 1000 ng with a sensitivity of 0.75 nA/ng and a limit of detection (LOD) of ~100 ng. The LOD was calculated by 3 times the standard deviation of the lowest concentration measured divided by the slope of the regression curve [18]. Beyond 1000 ng the response of the paper probe begins to saturate. The nature of the saturation most likely is caused by various parameter interactions including the slow diffusion coefficient of the TNT in the ethylene glycol, the mass transport of TNT in the ethylene glycol as it is wicked up to the working electrode and rate of electron transfer at the working electrode.

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.