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Rapid Surface-Enhanced Raman Spectroscopy Detection of Chlorothalonil in Standard Solution and Orange Peels with Pretreatment of Ultraviolet Irradiation
Bulletin of Environmental Contamination and Toxicology ( IF 2.7 ) Pub Date : 2021-06-15 , DOI: 10.1007/s00128-021-03258-9
Hang Yu 1, 2, 3, 4 , Lebei Xu 1, 2, 3, 4 , Fangwei Yang 1, 2, 3, 4 , Yunfei Xie 1, 2, 3, 4 , Yahui Guo 1, 2, 3, 4 , Yuliang Cheng 1, 2, 3, 4 , Weirong Yao 1, 2, 3, 4
Affiliation  

At present, the detection of chlorothalonil is generally based on chromatography and immunoassay; both of which are time-consuming and costly. In this study, Surface-enhanced Raman Spectroscopy (SERS) has been successfully utilized in the detection of chlorothalonil coupled with photochemistry and meanwhile, gold nanoparticles were prepared to enhance the Raman signal. Two Raman peaks (2246 cm− 1 and 2140 cm− 1) of chlorothalonil were appeared after ultraviolet (UV) irradiation compared to the original solution. Chlorothalonil generated excited and weakened C≡N bonds in its structure by absorbing UV energy, thus leading to two kinds of corresponding peaks. These two kinds of peaks were both selected as analytical peaks in chlorothalonil detection. Different light sources and solvents were made different contributions to the final spectra. Chlorothalonil methanol solution under 302 nm wavelength irradiation was performed the best. The 2246 cm− 1 sharp peak represented to the normal C≡N bond appeared at first, which overall trend was significantly increased followed by a gradual decrease. The 2140 cm− 1 broad peak represented to the weakened C≡N bond appeared later, which overall trend was increased as the irradiation time passing by and then kept stable. Natural bond orbital (NBO) analysis indicates that the downshift of C≡N bond from 2246 cm− 1 to 2140 cm− 1 is due to the increase of electronic populations of π* orbital of C≡N bond transited from π orbital excited by UV irradiation. The positively charged C≡N bond had more chance to approach negatively charged gold nanoparticles. The detection limit of chlorothalonil was as low as 0.1 ppm in the standard solution. Orange peels spiked with chlorothalonil oil were also detected in this paper to confirm the practical operability of this method. The SERS method may be further developed as a rapid detection of pesticides that contains a triple bond by utilizing photochemistry.



中文翻译:

紫外辐照预处理标准溶液和橙皮中百菌清的快速表面增强拉曼光谱检测

目前百菌清的检测一般采用层析法和免疫法;两者都是耗时且昂贵的。在这项研究中,表面增强拉曼光谱 (SERS) 已成功用于检测百菌清与光化学结合,同时制备了金纳米粒子以增强拉曼信号。两个拉曼峰(2246 cm − 1和 2140 cm − 1) 的百菌清在紫外线 (UV) 照射后与原始溶液相比出现。百菌清通过吸收紫外线能量在其结构中产生激发和减弱的 C≡N 键,从而导致两种相应的峰。这两种峰均被选为百菌清检测的分析峰。不同的光源和溶剂对最终光谱的贡献不同。百菌清甲醇溶液在 302 nm 波长照射下效果最好。代表正常C≡N键的2246cm -1尖峰首先出现,总体趋势显着增加,然后逐渐减少。2140 厘米− 1较弱的C≡N键所代表的宽峰出现较晚,总体趋势随着照射时间的推移而增加,然后保持稳定。自然键轨道(NBO)分析表明,C≡N 键从 2246 cm - 1下降到 2140 cm - 1是由于π * C≡N 键轨道从π跃迁的电子群增加由紫外辐射激发的轨道。带正电的 C≡N 键有更多机会接近带负电的金纳米粒子。百菌清在标准溶液中的检出限低至 0.1 ppm。本文还检测了添加百菌清油的橙皮,以证实该方法的实际可操作性。SERS 方法可以进一步发展为利用光化学快速检测含有三键的农药。

更新日期:2021-06-15
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