基于激光诱导击穿光谱技术的水中氮元素检测  

Determination of nitrogen in water based on laser‐induced breakdown spectroscopy

作　　者：杨新艳 王鑫 李东东 王玺[3] 祝鹏 刘昌 张徐 任红梅 秦正波[1,2] 华泽丰 郑贤锋 YANG Xinyan;WANG Xin;LI Dongdong;WANG Xi;ZHU Peng;LIU Chang;ZHANG Xu;REN Hongmei;QIN Zhengbo;HUA Zefeng;ZHENG Xianfeng(School of Physics and Electronic Information,Anhui Normal University,Wuhu 241002,China;Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials,Wuhu 241002,China;Electronic Countermeasure Institute,National University of Defense Technology,Hefei 230037,China)

机构地区：[1]安徽师范大学物理与电子信息学院,安徽芜湖241002 [2]光电信息材料功能调控与应用安徽省重点实验室,安徽芜湖241002 [3]国防科技大学电子对抗学院,安徽合肥230037

出　　处：《量子电子学报》2024年第3期506-513,共8页Chinese Journal of Quantum Electronics

基　　金：安徽省高等学校省级质量工程项目(2020jyxm0657);安徽省大学生创新创业训练项目(202310370679);先进激光技术安徽省实验室基金项目(AHL2020KF03,AHL2021ZR04);安徽省高校协同创新项目(GXXT-2021-029);河北省先进激光技术与装备重点实验室开放课题(HBKL-ALTE2024011);国防基础科研计划项目(JCKY2023230C010);脉冲功率激光技术国家重点实验室基金项目(SKL2022ZR10)。

摘　　要：利用气溶胶辅助激光诱导击穿光谱(LIBS)技术实现了对水中富营养化元素氮的实时在线准确快速检测。针对传统的同心雾化器对液体的进样量受液体物理性质限制的缺陷,本文采用微量注射泵辅助进样实现不同盐度待测样的相同进样量。结果表明,采用微量注射泵,N I 746.831 nm绝对光谱强度的平均相对标准偏差D_(RSAV)由19.51%改善至6.78%,定量分析检测极限LoD由5.45改善至1.57 mg/L,预测浓度与制备浓度的线性决定系数R^(2)、平均相对误差E_(R)和交叉验证均方根误差E_(RMSCV)分别由0.2830、45.80%和23.96mg/L改善至0.9043、10.33%和4.28 mg/L。本研究的结果表明微量注射泵辅助进样可实现气溶胶辅助LIBS技术对水中氮元素的精准灵敏检测。Real-time,online,accurate,and rapid detection of eutrophic element nitrogen in water was achieved using aerosol assisted laser-induced breakdown spectroscopy(LIBS)in this work.In response to the limitation that the liquid lifting capacity of traditional concentric atomizer is affected by liquid physical characteristics,a micro-volume syringe pump is used in this work to achieve the same liquid lifting volume of samples with different salinity.As a result,the average relative standard deviation(D_(RSAV))of the absolute intensity of N I peak at 746.831 nm is reduced from 19.51%to 6.78%,the limit of detection(LoD)is improved from 5.45 mg/L to 1.57 mg/L,and the linear correction coefficient R^(2),average relative error(E_(R)),and root mean square error of cross validation(E_(RMSCV))are improved from 0.2830,45.80%,and 23.96 mg/L to 0.9043,10.33%,and 4.28 mg/L,respectively.The results of this work indicate that the liquid aerosol assisted LIBS with the assistance of a micro injection pump for sample injection can be applied for accurate and sensitive detection of nitrogen in water.

关 键 词：光谱学 激光诱导击穿光谱 水 气溶胶 氮 微量注射泵 

分 类 号：O433.4[机械工程—光学工程]