Paper-Based Electrochemical Detection of Chlorate
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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We describe the use of a paper-based probe impregnated with a vanadium-containing polyoxometalate anion, PMo11VO405-, 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 mgmL with a detection limit of 0.083 mgmL SN 3. This performance was reproducible using PMo11VO405--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 mgmL with a detection limit of 0.31 mgmL SN 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 mgmL with a detection limit of 0.15 mgmL SN 3. Simple assays were conducted using three types of soil, and recovery measurements reported.
- Wood, Paper and Related Forestry Products
- Physical Chemistry