期刊
SENSORS
卷 18, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/s18020328
关键词
chlorate; electrochemical detection; paper-based probe; electrocatalysis; polyoxometalates
资金
- US Naval Research Laboratory
- Office of Naval Research through an NRL 6.2 Program
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.
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