Ventura M, Silva J R, Andrade L H C, Scorza Júnior R P, Lima S M
Grupo de Espectroscopia Óptica e Fototérmica, Programa de Pós-Graduação em Recursos Naturais, Universidade Estadual de Mato Grosso do Sul, CP 351 Dourados, MS, Brazil.
Embrapa Agropecuária Oeste, CP 449 Dourados, MS, Brazil.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Jan 5;188:32-36. doi: 10.1016/j.saa.2017.06.043. Epub 2017 Jul 4.
Thermal lens spectroscopy (TLS) in the near-near-infrared region was used to explore the absorptions of overtones and combination bands of sulfentrazone (SFZ) herbicide diluted in methanol. This spectroscopic region was chosen in order to guarantee that only thermal lens effect is noted during the experimental procedure. The results showed that it was possible to detect very low concentrations (~2ng/μL) of SFZ in methanol by determining its thermal diffusivity or the absorption coefficient due to the 3ν(NH)+1δ(CH) combination band. This minimum SFZ concentration is the limit observed by chromatography method. The findings demonstrated that the TLS can be used for precise and accurate assessment of pesticides in ecosystems. Besides, the 3ν(NH)+1δ(CH) combination band at 960nm can be used as a marker for SFZ in methanol.
利用近近红外区域的热透镜光谱法（TLS）研究了在甲醇中稀释的磺胺草唑（SFZ）除草剂泛频和组合带的吸收情况。选择该光谱区域是为了确保在实验过程中仅观察到热透镜效应。结果表明，通过测定其热扩散率或由于3ν(NH)+1δ(CH)组合带引起的吸收系数，可以检测到甲醇中极低浓度（约2ng/μL）的SFZ。这个最低SFZ浓度是色谱法观察到的极限。研究结果表明，TLS可用于精确准确地评估生态系统中的农药。此外，960nm处的3ν(NH)+1δ(CH)组合带可作为甲醇中SFZ的标记。
