Charles University, Faculty of Mathematics and Physics, Institute of Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
Charles University, Faculty of Mathematics and Physics, Institute of Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Dec 5;262:120109. doi: 10.1016/j.saa.2021.120109. Epub 2021 Jun 24.
Raman spectroscopy is a useful technique to identify small organic molecules, including contaminants. The drop coating deposition Raman (DCDR) is more sensitive than conventional Raman spectroscopy from solution. It is based on Raman measurement from a small drop dried on a hydrophobic surface where studied molecules are preconcentrated. In this paper, DCDR spectra of dried drops of selected contaminants (food contaminant melamine, fungicide thiram, herbicides bentazon and picloram) on the hydrophobic substrate were acquired for the first time, whereas Raman spectra from stock solutions were impossible to obtain under the same experimental conditions. The lowest DCDR detected concentrations were determined as 6.4 µM, 0.31 µM, 20 µM and 2 µM in deposited concentrations for melamine, thiram, bentazon and picloram, respectively. Therefore, DCDR spectroscopy can serve to detect these molecules in concentrations relevant in food/groundwater contaminations.
拉曼光谱是一种用于识别小分子有机化合物（包括污染物）的有用技术。滴涂沉积拉曼（DCDR）比传统的溶液拉曼光谱更为敏感。它基于在疏水表面上干燥的小液滴中的拉曼测量，其中研究的分子被预浓缩。在本文中，首次获得了在疏水基底上干燥的选定污染物（食品污染物三聚氰胺、杀菌剂福美双、除草剂苯达松和氯氨吡啶）的液滴的 DCDR 光谱，而在相同的实验条件下，无法获得来自储备溶液的拉曼光谱。在沉积浓度下，三聚氰胺、福美双、苯达松和氯氨吡啶的最低 DCDR 检测浓度分别为 6.4µM、0.31µM、20µM 和 2µM。因此，DCDR 光谱可用于检测食品/地下水污染中相关浓度的这些分子。
