Santos, J. S., Pontes, M. S., Santiago, E. F., Fiorucci, A. R., & Arruda, G. J.; “An efficient and simple method using a graphite oxide electrochemical sensor for the determination of glyphosate in environmental samples;” Science of The Total Environment, 2020, 749, 142385; DOI: 10.1016/j.scitotenv.2020.142385.

ABSTRACT:

Excessive and indiscriminate use of the herbicide glyphosate (GLY) leaves the environment susceptible to its contamination. This work describes the development of a simple, inexpensive, and efficient electroanalytical method using graphite oxide paste electrode (GrO-PE) for the direct determination of GLY traces in groundwater samples, soybean extracts, and lettuce extracts. Under optimal experimental conditions, the developed sensor exhibited a linear response of the peak current intensity vs. the concentration, in the range of 1.8 x 10(-5) to 1.2 x 10(-3) mol L(-1) for GLY. The limits of detection and quantification are 1.7 x 10(-8) mol L(-1) and 5.6 x 10(-8) mol L(-1), respectively. The methodology developed here demonstrated a strong analytical performance, with high reproducibility, repeatability, and precision. Moreover, it successfully avoided interference from other substances, showing high selectivity. The GrO-PE sensor was effectively applied to determine GLY traces in real samples with recovery rates ranging from 98% to 102%. Results showed that the GrO-PE is effective and useful for GLY detection, with the advantage of not involving laborious modifications and complicated handling, making it a promising tool for environmental analysis. FULL TEXT