期刊
VIBRATIONAL SPECTROSCOPY
卷 114, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.vibspec.2021.103245
关键词
Herbicide; Prometryn; SERS; Quantitative analysis
资金
- FAPESP [2020/05423-0, 2018/04628-8, 2016/09634-0, 2018/22214-6]
- CNPq
- CAPES PNPD
- MINECO [FIS2017-84318-R]
This study successfully detected the herbicide prometryn at low concentrations using surface-enhanced Raman scattering, investigating its adsorption on metal surfaces and chemical changes under different pH conditions. Ultimately, quantitative analysis of prometryn was achieved at neutral and alkaline pH by optimizing its interaction with metal surfaces.
The large use of herbicides applied in the control of agricultural pests has become a serious environmental problem. One of the concerns is the long persistence of these contaminants in soil and wastewater leading to the need of developing detection and quantification techniques. In this work, we applied surface-enhanced Raman scattering to detect prometryn herbicide using silver nanoparticles at low concentrations (ppb - parts per billion). The adsorption of prometryn on metallic surfaces was studied at different pH in order to optimize the interaction mechanism with the metal. The effect of pH is especially strong on prometryn, since it undergoes a chemical change at pH < 5 consisting in an hydroxylation of the triazine ring that leads to the hydroxylated prometryn. Thus, the quantitative analysis of prometryn was done at neutral and alkaline pH, at which prometryn interacts with the metal surface through the formation of coordination charge-transfer bonds. The detection of prometryn led to limit of detection of 1.2 x 10- 7 mol/L (28 ppb) at pH 11 and 5.3 x 10- 7 mol/L (128 ppb) at pH 7. The limit of detection at pH 11 is comparable to the concentration allowed to PRM in potable water by regulating organizations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据