摘要
将德国seal连续流动分析仪测定六价铬模块进行改造,用于测定水中亚硝酸盐氮含量。实验结果表明:标准曲线线性较好;检出限低,能满足环境质量标准限值检测要求;精密度高、重复性好,相对标准偏差为0.056%~0.25%;准确度高,有证标准物质均保证值范围,且相对误差为-0.70%~-2.81%;样品加标回收率为89.0%~104%;另外,与传统手工分光光度法相比,两种方法测定结果无显著差异。因此,本次研究方法测定淡水中亚硝酸盐氮具有自动化程度高、分析速度快、灵敏度高、检出限低、仪器稳定性好、试剂消耗少,环境污染小等优点,其在大批量样品分析中具有明显的优势。
The hexavalent chromium determination module of the SEAL continuous flow analyzer was modified for the determination of nitrite nitrogen content in water.The experimental results showed that the standard curve had:good linearity;low detection limit,meeting the requirements for detection limit in environmental quality standard;high precision and good repeatability,with a relative standard deviation of 0.056% to 0.25%;high accuracy,with certified reference materials ensuring a range of values and a relative error of-0.70% to-2.81%;and the recovery rate of spiking between 89.0% and 104%.In addition,compared with traditional manual spectrophotometry,there is no significant difference in the measurement results between the two methods.To sum up,the method used in this study to determine nitrite nitrogen in freshwater is featured by high automation,fast analysis speed,high sensitivity,low detection limit,good instrument stability,low reagent consumption,and low environmental pollution.It has obvious advantages in large-scale sample analysis.
作者
朱吉东
李会兰
李亚
魏冬梅
文明发
ZHU Ji-dong;LI Hui-lan;LI Ya;WEI Dong-mei;WEN Ming-fa(Ecological&Enwvironmental Monitoring Station of Department of Ecology&Environment of Yunnan Province in Wenshan,Wenshan,Yunnan 663099,China;Yunnan Deyuan Lvchuang Environmental Protection Technology Co.,Lid,Wenshan,Yunnan 663099,China)
出处
《四川环境》
2024年第6期118-123,共6页
Sichuan Environment
关键词
亚硝酸盐氮
连续流动分析法
Nitrite nitrogen
continuous flow analysis method
