基于一阶差分光谱的海水硝酸盐氮与亚硝酸盐氮测量方法  

Measurement Method of Nitrate and Nitrite in Seawater Based on First-Order Differential Spectrum

作　　者：梁星辉 冯巍巍[1,2,3] 蔡宗岐 王焕卿[1,2] 杨剑炼 LIANG Xing-hui;FENG Wei-wei;CAI Zong-qi;WANG Huan-qing;YANG Jian-lian(CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China;Shandong Key Laboratory of Coastal Environmental Processes,Yantai 264003,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,山东烟台264003 [2]山东省海岸带环境过程重点实验室,山东烟台264003 [3]中国科学院大学,北京100049

出　　处：《光谱学与光谱分析》2025年第1期45-51,共7页Spectroscopy and Spectral Analysis

基　　金：国家重点研发计划项目(2016YFC1400601);山东省重点研发计划项目(2022CXPT019)资助。

摘　　要：硝酸盐氮与亚硝酸盐氮是海洋水质监测的重点参数,也是研究海洋氮循环的重要参考。紫外吸收光谱法操作简单,响应快速,适用于多种水质参数监测,但测量中硝酸盐氮与亚硝酸盐氮存在混叠干扰以及海水离子干扰。提出了一种硝酸盐氮与亚硝酸盐氮快速测量方法,对光谱进行一阶差分等预处理,使用相关系数搜索进行波段优化,使用BP神经网络进行浓度反演,模型的预测值与真实值线性相关系数为0.998。与国外同类设备进行了比对测试,两者线性相关系数为0.982。参加了烟台市海洋环境监测预报中心2023年夏季航次,进行了应用测试,与实验室方法进行了比对分析,两者线性相关系数为0.902,说明本方法能够实现海水硝酸盐氮与亚硝酸盐氮的快速测量,为后续原位监测仪器的研制提供参考。As the key parameters of marine water quality monitoring,nitrate and nitrite are important references for studying the marine nitrogen cycle.The ultraviolet(UV)absorption spectrum is simple to operate and fast in response,and it is suitable for monitoring various water quality parameters.However,the measurement has aliasing interference between nitrate and nitrite and seawater ion interference.This paper proposes a rapid measurement method for nitrate and nitrite.First,the spectrum is preprocessed by first-order difference.Then,the correlation coefficient search is used to obtain the optimal modeling band.Finally,the BP neural network is used for concentration inversion.The linear correlation coefficient between the predicted value and the real value of the model is 0.998.The comparison test was conducted with similar equipment,and the linear correlation coefficient was 0.982.The application test was carried out in the 2023 summer voyage of Yantai Marine Environment Monitoring and Forecasting Center,and the linear correlation coefficient between the two methods was 0.902.The results show that this method can realize the rapid measurement of nitrate and nitrite in seawater and provide a reference for developing subsequent in-situ monitoring instruments.

关 键 词：硝酸盐氮 亚硝酸盐氮 紫外吸收光谱 一阶差分 BP神经网络 

分 类 号：O433.4[机械工程—光学工程]