期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 262, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.120109
关键词
Drop coating deposition Raman; DCDR; Contaminant; Melamine; Picloram; Thiram; Bentazon
类别
资金
- Czech Science Foundation [18-10897S]
- Charles University Research Centre program [UNCE/SCI/010]
- GA UK [290120]
DCDR spectroscopy is a sensitive technique for identifying small organic molecules, especially contaminants in food or groundwater. By acquiring DCDR spectra of dried drops on a hydrophobic substrate, it is more sensitive than conventional Raman spectroscopy and can detect harmful substances at very low concentrations.
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 mM, 0.31 mM, 20 mM and 2 mM 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. (c) 2021 Elsevier B.V. All rights reserved.
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