基于电化学传感器的总氮检测系统研究  

Detection of Total Nitrogen Based on Electrochemical Sensor

作　　者：李洋[1] 任振兴[1,2] 齐仁龙 佟建华[1] 边超[1] 董汉鹏[1] 夏善红[1] LI Yang;REN Zhen-Xing;QI Ren-Long;TONG Jian-Hua;BIAN Chao;DONG Han-Peng;XIA Shan-Hong(State Key Laboratory of Transducer Technology,Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;College of Mechanical Engineering,Chengdu University,Chengdu 610106,China;College of Electrical Engineering,Zhengzhou University of Science and Technology,Zhengzhou 450064,China)

机构地区：[1]中国科学院电子学研究所传感技术国家重点实验室,北京100190 [2]成都大学机械工程学院,成都610106 [3]郑州科技学院电气学院,郑州450064

出　　处：《分析化学》2020年第3期316-322,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.61701475,61771451);东南大学MEMS教育部重点实验室开放研究基金项目(No.3206009301);传感技术国家重点实验室开放课题项目(No.SKT15015)资助~~

摘　　要：针对水体环境监测中,商用总氮检测仪器体积大、价格昂贵的问题,提出碱性过硫酸钾消解-电化学传感器联用检测总氮的方法,利用电化学传感器代替传统的分光光度计,实现消解后水样中NO 0x0E䥺Symbolm@@0x0F 3的识别和检测,进而测定水样中的总氮浓度。基于此工作原理研制了一种总氮检测系统。此系统以NO 0x0E䥺Symbolm@@0x0F 3电化学微传感电极为核心部件,利用铜纳米材料对消解后水样中NO 0x0E䥺Symbolm@@0x0F 3的电催化还原特性,测量还原电流的大小,实现水样总氮浓度的检测,在0.2~2.0 mg/L浓度范围内,响应灵敏度为7.31μA·L/mg。使用此系统对3个总氮标样和北京等地的6个湖库、河流水样进行检测,测试结果表明,此传感器系统能够测定国标Ⅰ~Ⅴ类水质水样中总氮,且对实际水样的检测结果与专业水质检测机构的测试结果基本吻合(最大相对偏差为26.9%),初步实现总氮检测仪器的低成本和小型化。A system based on electrochemical microsensor was developed for total nitrogen(TN)determination in freshwaters.A new method combined alkaline potassium persulfate digestion with electrochemical sensor was used to detect TN concentration.After the digestion pretreatment for water samples,a customized electrochemical sensor,rather than the expensive spectrophotometer,was employed to detect the nitrate concentration in the digested solution,and then the TN concentration was calculated by a portable meter.Copper was electrodeposited onto the working-electrode of the sensor as the electrocatalyst material and performed high sensitivity in nitrate detection.The calibration in digested samples showed that the system had a sensitivity of 7.31μA·L/mg for TN in the concentration range of 0.2-2.0 mg/L.The concentrations of TN in 3 standard samples and 6 real samples from lakes and rivers were detected by the portable electrochemical system,and the results were in good agreement with the data obtained by standard TN measurement method with the maximal relative deviation of 26.9%.

关 键 词：总氮 碱性过硫酸钾消解 电化学传感器 硝酸盐 湖库水样 

分 类 号：X832[环境科学与工程—环境工程]