Back to Search Start Over

Paper-Based Electrochemical Detection of Chlorate

Authors :
David A. Stenger
Scott A. Trammell
Lisa C. Shriver-Lake
Walter J. Dressick
Daniel Zabetakis
Source :
Sensors, Vol 18, Iss 2, p 328 (2018), Sensors (Basel, Switzerland), Sensors; Volume 18; Issue 2; Pages: 328
Publication Year :
2018
Publisher :
MDPI AG, 2018.

Abstract

We describe the use of a paper-based probe impregnated with a vanadium-containing polyoxometalate anion, [PMo11VO40]5−, on screen-printed carbon electrodes for the electrochemical determination of chlorate. Cyclic voltammetry (CV) and chronocoulometry were used to characterize the ClO3− response in a pH = 2.5 solution of 100 mM sodium acetate. A linear CV current response was observed between 0.156 and 1.25 mg/mL with a detection limit of 0.083 mg/mL (S/N > 3). This performance was reproducible using [PMo11VO40]5−-impregnated filter paper stored under ambient conditions for as long as 8 months prior to use. At high concentration of chlorate, an additional catalytic cathodic peak was seen in the reverse scan of the CVs, which was digitally simulated using a simple model. For chronocoulometry, the charge measured after 5 min gave a linear response from 0.625 to 2.5 mg/mL with a detection limit of 0.31 mg/mL (S/N > 3). In addition, the slope of charge vs. time also gave a linear response. In this case the linear range was from 0.312 to 2.5 mg/mL with a detection limit of 0.15 mg/mL (S/N > 3). Simple assays were conducted using three types of soil, and recovery measurements reported.

Details

Language :
English
ISSN :
14248220
Volume :
18
Issue :
2
Database :
OpenAIRE
Journal :
Sensors
Accession number :
edsair.doi.dedup.....68c44ee8c88decabb0d0185e677749c4