两种氨氮在线分析方法的质控结果及影响因素  

Quality control results and influencing factors of two online analysis methods for ammonia nitrogen

作　　者：薛京洲 何仁江 龙小兰 XUE Jingzhou;HE Renjiang;LONG Xiaolan(Luzhou Ecological and Environmental Monitoring Central Station of Sichuan Province,Luzhou 646000,China;Luzhou Key Laboratory of Environmental Health Effects and Risk Assessment,Luzhou 646000,China;School of Public Health,Southwest Medical University,Luzhou 646000,China)

机构地区：[1]四川省泸州生态环境监测中心站,四川泸州646000 [2]环境健康效应及风险评估泸州市重点实验室,四川泸州646000 [3]西南医科大学公共卫生学院,四川泸州646000

出　　处：《贵州科学》2024年第2期70-73,共4页Guizhou Science

基　　金：泸州市人民政府-西南医科大学科技战略合作项目(2023LZXNYDJ050);西南医科大学校级科研项目(2021ZKQN004)。

摘　　要：选用2023年泸州市4个水质自动站的氨氮在线分析仪质控数据,分析了水杨酸分光光度法和氨气敏电极法两种方法的准确性和稳定性以及影响因素。结果表明,水杨酸分光光度法的准确性和稳定性较好,但抗浊度干扰能力较弱,应严格执行水样预处理措施,加强仪器日常清洗维护;氨气敏电极法的线性范围和抗浊度干扰能力较好,但受半透膜的质量、电解质的浓度、加热温度的波动及电极本身的老化程度的影响,系统误差较大,应定期对仪器检查并及时更换耗材。This article uses the quality control data of the ammonia nitrogen online analyzers in four automatic water quality stations in Luzhou City in 2023 to analyze the accuracy,stability and influencing factors of salicylic acid spectrophotometric method and ammonia-sensitive electrode method.The results show that the salicylic acid spectrophotometric method has good accuracy and stability,but its ability to resist turbidity interference is weak.Water sample pretreatment measures should be strictly implemented and daily cleaning and maintenance of the instrument should be strengthened.The linear range and anti-turbidity interference ability of the ammonia-sensitive electrode method are good,but the system error is large due to the quality of the semipermeable membrane,the concentration of the electrolyte,the fluctuation of the heating temperature and the aging of the electrode.The instrument should be checked regularly and consumables should be replaced in time.

关 键 词：氨氮 水杨酸分光光度法 氨气敏电极法 地表水自动监测 

分 类 号：X831[环境科学与工程—环境工程]