激光诱导击穿光谱对农药气溶胶的在线监测  

Online Monitoring of Pesticides Based on Laser Induced BreakdownSpectroscopy

作　　者：张兴龙 刘玉柱[1,2] 孙仲谋 张启航 陈宇 布玛丽亚·阿布力米提[3] ZHANG Xing-long;LIU Yu-zhu;SUN Zhong-mou;ZHANG Qi-hang;CHEN Yu;MAYALIYA·Abulimiti(Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean,Nanjing University of Information Science&Technology,Nanjing 210044,China;Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology(CICAEET),Nanjing 210044,China;College of Physics and Electronic Engineering,Xinjiang Normal University,Urumqi 830054,China)

机构地区：[1]南京信息工程大学江苏省大气海洋光电探测重点实验室,江苏南京210044 [2]江苏省大气环境与装备技术协同创新中心,江苏南京210044 [3]新疆师范大学物理与电子工程学院,新疆乌鲁木齐830054

出　　处：《光谱学与光谱分析》2022年第6期1711-1715,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(U1932149);新疆区域协同创新专项(2019E0223);新疆天山青年计划项目(2018Q072)资助。

摘　　要：作为现代农业的重要工具,农药凭借其高效的灭病虫害能力在农业生产中应用广泛,然而其灭杀虫害的同时对大气环境和人体健康等方面也会造成危害。使用激光诱导击穿光谱(LIBS)技术对农药的气溶胶喷雾进行了在线探测,研究了使用LIBS技术对农药使用过程的实时监测。首先检测了清洁环境下的空气LIBS光谱,在空气的光谱中探测到大量的氮(N)、氧(O)原子发射谱,这个结果与空气成分是相吻合的;同时还观察到了氢(H)的两条巴尔默系原子谱线,这主要是来源于空气中的水蒸气。值得注意的是,在空气谱中还发现了两条氩(Ar)的原子谱线,这也表明LIBS技术在微量元素检测方面有着重大潜力。选用农药敌杀死作为研究对象,对其有效成分溴氰菊酯(C_(22)H_(19)Br_(2)NO_(3),CAS:52918-63-5)进行了LIBS检测。在溴氰菊酯的LIBS光谱中观察到了卤素元素溴(Br)的存在,标记出了两条Br的原子发射谱线(827.294和833.470 nm)。对农药样品进行探测时也发现了包括CN分子发射谱与C_(2)分子发射谱等大量空气光谱中没有检测到的特征谱线;同时还检测到了空气谱中没有观测到的元素纳(Na)以及钙(Ca);尤其是Ca,农药中不仅仅检测出了Ca的存在,而且相比于溴氰菊酯光谱中Ca谱线的能量以及数量都有着非常明显的上升。最后,实验中对CN分子的温度进行了研究;拟合得到溴氰菊酯与农药的CN分子的振动温度分别为8800和6200 K,转动温度分别为8600和5500 K。以上结果表明了使用LIBS技术对农药的在线监测是可行的,是有发展前景的。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(H_(α) and H_(β))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(C_(22)H_(19)Br_(2)NO_(3),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 C_(2) 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 8800 and 6200 K respectively,and the rotational temperature to be 8600 and 5500 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 m

关 键 词：激光诱导击穿光谱 农药 敌杀死 溴氰菊酯 

分 类 号：O433.4[机械工程—光学工程]