期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 52, 期 12, 页码 2557-2571出版社
WILEY
DOI: 10.1002/jrs.6222
关键词
mechanism of interaction; pesticide; quantitative detection; SERS; thiram
类别
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2017/15019-0, 2018/22214-6, 2020/05423-0]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [420449/2018-3]
- CNPq/INEO
- CAPES
The study focused on the SERS effect of the fungicide thiram, analyzing its concentration and adsorption mechanism. Experimental results showed linear SERS intensity variation with a detection limit of 1.2 x 10(-8) mol/L and 1.7 x 10(-9) mol/L.
The development of strategies to monitor the applications of pesticides is of primary importance. In the present report, two aspects of the surface-enhanced Raman scattering (SERS) effect of the fungicide thiram were investigated: quantitative analysis using the standard addition method and the thiram adsorption mechanism onto Ag nanostructures using theoretical approach. Experimentally, SERS intensity varies linearly from 1.0 x 10(-8) to 4.0 x 10(-7) mol/L with thiram concentration leading to a limit of detection of 1.2 x 10(-8) mol/L for the band at 560 cm(-1) and 1.7 x 10(-9) mol/L for 1386 cm(-1). The loss of linearity (above 10(-6) mol/L) was associated with changes in the Ag colloid aggregation, also indicated by complementary analyses via UV-Vis extinction spectroscopy, dynamic light scattering, and zeta potential. The differences in the spectral profiles observed for thiram Raman powder and SERS are ascribed to S-S cleavage, leading the degraded thiram adsorbing to Ag surface not only through S atoms but also through methyl groups.
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