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 × 10⁻⁵ to 1.2 × 10⁻³ mol L⁻¹ for GLY. The limits of detection and quantification are 1.7 × 10⁻⁸ mol L⁻¹ and 5.6 × 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.

过度和随意使用除草剂草甘膦（GLY）会使环境容易受到其污染。这项工作描述了使用氧化石墨糊电极（GrO-PE）来直接测定地下水样品，大豆提取物和生菜提取物中的GLY痕迹的简单，廉价且有效的电分析方法的发展。在最佳实验条件下，开发的传感器对GLY表现出峰值电流强度与浓度的线性响应，范围为1.8×10 ^-5到1.2×10 ^-3 mol L ^-1。检测和定量限为1.7×10 ^-8 mol L ^-1和5.6×10 ^-8 mol L^-1。此处开发的方法论证明了强大的分析性能，具有很高的重现性，可重复性和准确性。此外，它成功避免了来自其他物质的干扰，显示出高选择性。GrO-PE传感器有效地用于测定真实样品中的GLY痕迹，回收率范围从98％到102％。结果表明，GrO-PE对GLY的检测是有效和有用的，其优点是无需费力的修改和复杂的处理，使其成为进行环境分析的有前途的工具。