水杨酸分光光度法测定水中氨氮含量不确定度的评定  

Evaluation of Ammonia Nitrogen Uncertainty in Water by Salicylic Acid Spectrophotometry

作　　者：刘海燕 赵玉茹 宋希民 Liu Haiyan;Zhao Yuru;Song Ximin(Beijing Urban Drainage Monitoring Center Co.,Ltd.,Beijing 100012,China)

机构地区：[1]北京市城市排水监测总站有限公司,北京100012

出　　处：《市政技术》2022年第4期193-197,共5页Journal of Municipal Technology

摘　　要：水中氨氮含量是反映水质状况的重要参数。水杨酸分光光度法是测量水中氨氮含量的重要方法之一。通过对水中氨氮含量测定不确定度的评定,分析影响氨氮定量检测的相关因素。根据HJ 536-2009《水质氨氮的测定水杨酸分光光度法》,按照JJF 1059.1-2012《测量不确定度评定与表示》和《化学分析中不确定度的评估指南》中有关规定,建立氨氮含量计算的数学模型,对氨氮含量测定不确定度来源进行了分析和评定。结果表明,水中氨氮含量为0.556 mg/L时,扩展不确定度为0.017 mg/L,不确定度主要来源为标准曲线拟合。该研究结论为进一步提高氨氮检测准确度,降低实验成本提供了参考方向。The ammonia nitrogen content in water is an important parameter of water quality. Salicylic acid spectrophotometry is one of the most important methods to measure ammonia nitrogen in water. By the evaluation of the uncertainty of ammonia nitrogen detection in water, the relevant factors affecting the detection were analyzed. According to Water quality-Determination of ammonia nitrogen-Salicylic acid spectrophotometry(HJ 536—2009), Evaluation and Expression of Uncertainty in Measurement(JJF 1059.1—2012) and Guidance on Quantifying Uncertainty in Chemical Analysis, a mathematical model was established to analyze and evaluate the sources of ammonia nitrogen uncertainty. The results showed that when the content of ammonia nitrogen in water was 0.556 mg/L, the expanded uncertainty was 0.017 mg/L. The main source of uncertainty was standard curve fitting. The conclusion provides direction for further improving the accuracy and reducing cost of ammonia nitrogen detection.

关 键 词：不确定度评定 氨氮 水杨酸分光光度法 

分 类 号：X832[环境科学与工程—环境工程]