To achieve a fast, sensitive and inexpensive method for the detection of ethion in the presence of Hg²⁺ ions, a nitrogen and sulfur co-doped graphene quantum dot (N,S/GQD)-based fluorescence sensing system was developed. The fluorescence of N,S/GQDs is sensitively quenched as a result of electrostatic interactions with Hg²⁺ ions adsorbed onto the negatively charged N,S/GQD surface. Following the introduction of ethion, the fluorescence of the Hg²⁺-quenched N,S/GQDs is recovered due to the strong coordination between Hg²⁺ and ethion. Based on the intensities of the recovered fluorescence of the N,S/GQDs, the ethion concentration was easily quantified. The linear response range of this method for ethion was from 19.2 μg L⁻¹ M to 961.2 μg L⁻¹. In this sensing system, not only was the detection limit as low as 8 μg L⁻¹, which was as good as or better than those of similar assays, but the sensing system also displayed good selectivity in detecting ethion in the presence of different physiological molecules and inorganic ions. The proposed sensing method was successfully applied to the detection of ethion in water and food samples and was found to produce encouraging results.

中文翻译：

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使用开启荧光N和S共掺杂的石墨烯量子点对食物样品中的乙硫醚进行敏感识别†

为实现在Hg ²⁺离子存在下快速，灵敏且廉价的乙硫醇检测方法，开发了一种基于氮和硫共掺杂的石墨烯量子点（N，S / GQD）的荧光传感系统。N，S / GQDs的荧光由于与吸附在带负电的N，S / GQD表面的Hg ²⁺离子发生静电相互作用而灵敏地淬灭。引入乙硫醇后，由于Hg ²⁺与乙硫醇之间的强配位作用，Hg ²⁺猝灭的N，S / GQDs的荧光得以恢复。根据回收的N，S / GQDs荧光强度，可以轻松定量乙硫醚浓度。该方法对乙硫氨酸的线性响应范围为19.2μgL^-1 M至961.2μgL ^-1。在该感测系统中，不仅检测限低至8μgL ^-1，与同类测定法的检测限一样好或更好，而且该感测系统在存在不同生理状态下检测乙硫醇时也显示出良好的选择性。分子和无机离子。所提出的传感方法已成功地应用于水和食物样品中的乙硫醚的检测，并发现产生了令人鼓舞的结果。