激光与光电子学进展, 2020, 57 (13): 133003, 网络出版: 2020-07-09   

草甘膦溶液挥发物的表面增强拉曼光谱分析 下载: 1003次

Surface Enhanced Raman Spectroscopy Analysis of Glyphosate Solution Volatiles
杨永安 1,2,*张德清 1,2张川云 1,2司民真 1,2,**
作者单位
1 楚雄师范学院云南省高校分子光谱重点实验室, 云南 楚雄 675000
2 楚雄师范学院光谱应用技术研究所, 云南 楚雄 675000
摘要
以市场上销售的草甘膦农药作为实验样品,以内壁吸附银纳米粒子的毛细玻璃管为活性基底,对农药草甘膦及其在空气中的挥发物进行表面增强拉曼光谱(SERS)研究,探索一种使用农药挥发物来检测农药残留量的新方法。用所制备的银胶基底,对市售的不同浓度的草甘膦农药进行了SERS检测,得到草甘膦农药溶液的检测浓度可以达到1.8×10 -6 mol/L。利用所制备的毛细玻璃管银胶基底对不同浓度草甘膦农药溶液挥发物的SERS进行了检测,当草甘膦农药溶液稀释到浓度为1.8×10 -6 mol/L时,其溶液挥发物仍然有明显的草甘膦农药特征吸收峰,说明本实验方法对草甘膦农药溶液挥发物的检测浓度达到1.8×10 -6 mol/L(约等于0.3 mg/kg)。根据2016年制定的《食品安全国家标准》,水果中最大草甘膦残留量为0.5 mg/kg。与国家标准对比,被检测水中草甘膦农药残留浓度已基本达到国家农药残留最大检测标准,因此本实验方法可以作为检测农药草甘膦残留量的一种科学有效的方法,同时可为其他农药残留的检测提供参考。
Abstract
Taking glyphosate pesticide sold in the market as test sample and capillary glass tube with Ag nanoparticles adsorbed on the inner wall as active substrate, the surface enhanced Raman spectra (SERSs) of the glyphosate and its volatiles in the air are studied to explore a new method for determination of the pesticide residues using the pesticide volatiles. Using prepared Ag colloid substrates, the SERS detection is performed on commercially available glyphosate pesticides with different concentrations, and the detection concentration of the glyphosate can be as low as 1.8×10 -6 mol/L. Next the SERS of the volatiles of glyphosate solutions with different concentrations are studied by using the prepared capillary glass tube. When the glyphosate solution is diluted to a concentration of 1.8×10 -6 mol/L, there is still a significant characteristic absorption peak of the glyphosate, which indicates the detected concentration of the experimental method can reach 1.8×10 -6 mol/L (about 0.3 mg/kg). According to the National Food Safety Standard formulated in 2016, the maximum glyphosate residue in fruits is 0.5 mg/kg. Compared with the national standard,the concentration of the glyphosate pesticide residues in the detected water has basically reached the national maximum detection standard of pesticide residues. Therefore, this experimental method can be used as a scientific and effective method for the detection of glyphosate pesticide residues and can provide a reference for detecting other pesticide residues.

杨永安, 张德清, 张川云, 司民真. 草甘膦溶液挥发物的表面增强拉曼光谱分析[J]. 激光与光电子学进展, 2020, 57(13): 133003. Yongan Yang, Deqing Zhang, Chuanyun Zhang, Minzhen Si. Surface Enhanced Raman Spectroscopy Analysis of Glyphosate Solution Volatiles[J]. Laser & Optoelectronics Progress, 2020, 57(13): 133003.

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