Copper porphyrin metal-organic framework modified carbon paper for electrochemical sensing of glyphosate

Abstract

Glyphosate (GLY), an exceedingly effective herbicide, has raised worries about the risks posing to the ecosystem and human health due to excessive exposure. An electrochemical sensor based on copper porphyrin metal organic framework and gold nanoparticles modified carbon paper (Cu-TCPP/AuNPs/CP) was developed for sensitive determination of GLY by differential pulse voltammetry (DPV). The Cu-TCPP has large surface area and excellent catalytic activity, increasing the copper sites to combine with GLY for selective determination and improving the sensitivity of the electrochemical sensor. Under optimized conditions, the constructed sensor has a linear range from 0.2 to 120 μmol L−1 with a detection limit of 0.03 μmol L−1 (S/N = 3). The sensor was applied to water, soybean, wheat and carrot with the recovery ranging from 97.5% to 110.7%. After two weeks storage at 4 °C, the peak current of the sensor remains 86.6% of the original value with negligible interference. This sensor has a great potential application in water, soil and other environmental samples.