Highly sensitive determination of trace arsenic(III) onto carbon paste electrode modified with graphitic carbon...

An effective electrochemical sensor was developed to detect and determine of the As(III) by modifying the carbon paste electrode (CPE) with graphitic carbon nitride decorated with iron-based metal-organic frameworks (Fe-MOF/g-C₃N₅). The differential pulse anodic stripping voltammetry (DPASV) method was used to analyze As(III) ions in a phosphate buffer solution (0.10 M, pH = 5). Fe-MOF/g-C₃N₅/CPE showed high sensitivity (4.24 μA μg^-1 L), satisfactory linear range (0.50 μg L^-1-5.00 μg L^-1 and 5.00 μg L^-1-30.00 μg L^-1), and low detection limit (LOD, 0.013 μg L^-1). The prepared sensor was showed an excellent repeatability and selectivity, and successfully used for determination of the As(III) ion in ambient waters and apple juice samples.