氨气敏电极法和纳氏试剂分光光度法对地表水中氨氮的比对测试  

Comparison of Ammonia Gas Sensitive Electrode Method and Nessler Reagent Spectrophotometry for Determination of Ammonia Nitrogen in Surface Water

作　　者：吴正华 陈大密 李琴 WU Zheng-hua;CHEN Da-mi;LI Qin(Cangnan Environmental Monitoring Station,Zhejiang,Wenzhou 325800,China)

机构地区：[1]苍南县环境监测站

出　　处：《环境监控与预警》2019年第3期19-22,共4页Environmental Monitoring and Forewarning

摘　　要：采用不同质量浓度的氨氮标准样品和实际样品,用氨气敏电极法和纳氏试剂分光光度法进行同步测试。结果表明,2种分析方法在水样氨氮质量浓度在0.159~2.81mg/L范围内具有良好的可比性、精密性和准确性。氨气敏电极法的检出限为0.03mg/L,平行6次测定样品的相对标准偏差为0.4%~4.2%,加标回收率为85.0%~110%;纳氏试剂分光光度法的检出限为0.025mg/L,平行6次测定样品的相对标准偏差为0.5%~6.4%,加标回收率为93.0%~99.8%。同时氨气敏电极法在样品预处理、试剂配制和分析时间上要优于纳氏试剂分光光度法。氨气敏电极法能够满足地表水自动监测在线比对实际工作的需求,该方法具有良好的适用性。Simultaneous determination of ammonia-nitrogen standard sample and actual sample with different concentration was carried out by ammonia gas-sensitive electrode method and Nessler reagent spectrophotometry.The results showed that the two analytical methods had good comparability,precision and accuracy in the range of 0.159~2.81 mg/L ammonia nitrogen concentration in water samples.The detection limit of ammonia gas-sensitive electrode method was 0.03 mg/L.The relative standard deviation of samples was 0.4%~4.2%( n =6).The recovery rate of standard addition were 85.0%~110%.The detection limit of Nessler reagent spectrophotometry was 0.025 mg/L.The relative standard deviation of samples was 0.5%~6.4%( n =6).The recovery rate of standard addition was 93.0%~99.8%.At the same time,ammonia gas sensitive electrode method was superior to Nessler reagent spectrophotometry in sample pretreatment,reagent preparation and analysis time.The ammonia gas sensitive electrode method can meet the requirement of on-line comparison of surface water automatic monitoring.This method has good applicability.

关 键 词：地表水 氨氮 自动监测 氨气敏电极法 纳氏试剂分光光度法 比对 

分 类 号：X832[环境科学与工程—环境工程] O657.3[理学—分析化学]