Online Monitoring of Pesticides Based on Laser Induced Breakdown
Spectroscopy
ZHANG Xing-long1, LIU Yu-zhu1, 2*, SUN Zhong-mou1, ZHANG Qi-hang1, CHEN Yu1, MAYALIYA·Abulimiti3*
1. Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China
2. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing 210044, China
3. College of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China
Abstract：As an important tool of modern agriculture, pesticides are widely used in agricultural production with the advantage of their efficient ability to kill pests and diseases, but they also cause pollution to the environment while killing pests. In this paper, a spectral detection of pesticide spray was carried out to study the real-time monitoring of pesticide use by laser-induced breakdown spectroscopy(LIBS) technology. First, the atmospheric LIBS spectrum in a clean environment was detected. Many atoms emission spectra of nitrogen (N) and oxygen (O) were detected in the air spectrum, which has a good consistency with the air composition. At the same time, two hydrogen Balmer series atomic lines (Hα and Hβ) were also observed, which was mainly derived from water vapor in the air. It is worth noting that two Argon(Ar) atomic lines were also found in the air spectra, indicating that the LIBS technology has great potential in detecting trace elements. In this experiment, the pesticide Decis was selected as the research object, and LIBS tested its active ingredient deltamethrin (C22H19Br2NO3，CAS: 52918-63-5). The halogen element bromine(Br) was observed in the spectra of deltamethrin, and two Br atomic emission lines (827.294, 833.470 nm) were marked. During the detection of pesticide samples, many characteristic spectral lines that did not appear in the air spectrum were also found, including CN molecular band and C2 molecular band. What are more, elements natrium(Na) and calcium(Ca) that were not observed in the air spectra were also detected. Especially for Ca, the intensity and number of spectral lines in pesticides significantly increase. Finally, the temperature of the CN molecule was studied. The vibrational temperature of CN molecule in deltamethrin and pesticide were estimated to be 8 800 and 6 200 K respectively, and the rotational temperature to be 8 600 and 5 500 K respectively. The above results indicated that it is feasible to use LIBS technology to monitor pesticides online, and LIBS technology has a promising future in pesticide monitoring.
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