Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants
This effort evaluated the potential of two prototype devices for enhanced electrochemical detection of 2,4,6-trinitrotoluene (TNT) and dinitrotoluene (DNT) following preconcentration using an organosilicate sorbent. The bench-scale prototype provides adsorption of the targets from aqueous solution f...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2014-06-01
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| Series: | Chemosensors |
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| Online Access: | http://www.mdpi.com/2227-9040/2/2/131 |
| _version_ | 1819239408344236032 |
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| author | Brandy J. Johnson Mansoor Nasir Ronald L. Siefert Iwona A. Leska Jeffrey S. Erickson Paul T. Charles Brian J. Melde Jenna R. Taft |
| author_facet | Brandy J. Johnson Mansoor Nasir Ronald L. Siefert Iwona A. Leska Jeffrey S. Erickson Paul T. Charles Brian J. Melde Jenna R. Taft |
| author_sort | Brandy J. Johnson |
| collection | DOAJ |
| description | This effort evaluated the potential of two prototype devices for enhanced electrochemical detection of 2,4,6-trinitrotoluene (TNT) and dinitrotoluene (DNT) following preconcentration using an organosilicate sorbent. The bench-scale prototype provides adsorption of the targets from aqueous solution followed by elution in a mixture of methanol and potassium chloride (KCl). Following elution, the eluant is diluted using an aqueous KCl solution to provide sufficient electrolyte for electrochemical analysis. Concentrations of methanol greater than 50% were detrimental to sensor performance and lifetime. Calibration of the electrochemical sensor was completed and results of electrochemical analysis were compared to those of HPLC analysis over a range of concentrations and in varied matrices. TNT detection was found to be consistent and detection limits were improved from 200 ppb to 3 ppb depending on the sample volume utilized. DNT detection showed higher variability and significantly greater false response rates. On the basis of these results, a second, more advanced, prototype was developed and utilized in limited field trials with the intention of moving the technology toward in situ applications. |
| first_indexed | 2024-12-23T13:51:39Z |
| format | Article |
| id | doaj.art-eedbaaf9b4a546cf89c078197450762d |
| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-12-23T13:51:39Z |
| publishDate | 2014-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemosensors |
| spelling | doaj.art-eedbaaf9b4a546cf89c078197450762d2022-12-21T17:44:35ZengMDPI AGChemosensors2227-90402014-06-012213114410.3390/chemosensors2020131chemosensors2020131Electrochemical Detection with Preconcentration: Nitroenergetic ContaminantsBrandy J. Johnson0Mansoor Nasir1Ronald L. Siefert2Iwona A. Leska3Jeffrey S. Erickson4Paul T. Charles5Brian J. Melde6Jenna R. Taft7Center for Bio/Molecular Science and Engineering, US Naval Research Laboratory, Washington, DC 20375, USABiomedical Engineering, Lawrence Technical University, Southfield, MI 48075, USAUS Naval Academy, Annapolis, MD 21402, USANOVA Research Incorporated, Alexandria, VA 22308, USACenter for Bio/Molecular Science and Engineering, US Naval Research Laboratory, Washington, DC 20375, USACenter for Bio/Molecular Science and Engineering, US Naval Research Laboratory, Washington, DC 20375, USACenter for Bio/Molecular Science and Engineering, US Naval Research Laboratory, Washington, DC 20375, USANOVA Research Incorporated, Alexandria, VA 22308, USAThis effort evaluated the potential of two prototype devices for enhanced electrochemical detection of 2,4,6-trinitrotoluene (TNT) and dinitrotoluene (DNT) following preconcentration using an organosilicate sorbent. The bench-scale prototype provides adsorption of the targets from aqueous solution followed by elution in a mixture of methanol and potassium chloride (KCl). Following elution, the eluant is diluted using an aqueous KCl solution to provide sufficient electrolyte for electrochemical analysis. Concentrations of methanol greater than 50% were detrimental to sensor performance and lifetime. Calibration of the electrochemical sensor was completed and results of electrochemical analysis were compared to those of HPLC analysis over a range of concentrations and in varied matrices. TNT detection was found to be consistent and detection limits were improved from 200 ppb to 3 ppb depending on the sample volume utilized. DNT detection showed higher variability and significantly greater false response rates. On the basis of these results, a second, more advanced, prototype was developed and utilized in limited field trials with the intention of moving the technology toward in situ applications.http://www.mdpi.com/2227-9040/2/2/131nitroenergetictrinitrotoluenedinitrotoluenesolid phase extractionorganosilicaenvironmental monitoringfield trials |
| spellingShingle | Brandy J. Johnson Mansoor Nasir Ronald L. Siefert Iwona A. Leska Jeffrey S. Erickson Paul T. Charles Brian J. Melde Jenna R. Taft Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants Chemosensors nitroenergetic trinitrotoluene dinitrotoluene solid phase extraction organosilica environmental monitoring field trials |
| title | Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants |
| title_full | Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants |
| title_fullStr | Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants |
| title_full_unstemmed | Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants |
| title_short | Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants |
| title_sort | electrochemical detection with preconcentration nitroenergetic contaminants |
| topic | nitroenergetic trinitrotoluene dinitrotoluene solid phase extraction organosilica environmental monitoring field trials |
| url | http://www.mdpi.com/2227-9040/2/2/131 |
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