无特殊前处理条件下清洁水中低浓度氨氮测定方法的比对  

Comparison of Low-Concentration Ammonia Nitrogen Determination Methods in Clean Water Without Special Pretreatment Conditions

作　　者：周敬峰 朱红霞[2] 王婷 姜丽 金淑聪 胡佳欣 ZHOU Jingfeng;ZHU Hongxia;WANG Ting;JIANG Li;JIN Shucong;HU Jiaxin(Beibu Gulf Marine Ecological Environment Field Observation and Research Station of Guangxi,Marine Environmental Monitoring Centre of Guangxi,Beihai 536000,China;State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring,China National Environmental Monitoring Center,Beijing 100012,China;Environmental Monitoring Center Station of Baoji,Baoji 721000,China;Environmental Monitoring Center Sation of Fujian Province,Fuzhou 350000,China;Changji Ecological Environment Monitoring Station in Xinjiang Uygur Autonomous Region,Changji 831100,China)

机构地区：[1]广西壮族自治区海洋环境监测中心站,北部湾海洋生态环境广西野外科学观测研究站,广西北海536000 [2]中国环境监测总站,国家环境保护环境监测质量控制重点实验室,北京100012 [3]宝鸡市环境监测中心站,陕西宝鸡721000 [4]福建省环境监测中心站,福建福州350000 [5]新疆维吾尔自治区昌吉生态环境监测站,新疆昌吉831100

出　　处：《中国环境监测》2023年第5期218-225,共8页Environmental Monitoring in China

基　　金：广西科技重点研发计划项目(桂科AB20297037)。

摘　　要：清洁水中低浓度氨氮的准确定量一直备受关注,相关标准方法中建议清洁水可直接取样测定,故在实际监测过程中常出现方法间不可比的现象。选用氨氮测试的纳氏试剂分光光度法、气相分子吸收法和离子色谱法,比较各方法在未经前处理条件下的检出限。使用氨氮含量较低的清洁水,分析其在pH、色度、浊度、硬度、氯离子、钠离子和硫化物等干扰存在下的测定结果,进而探讨在不同干扰条件下更适合清洁水中低浓度氨氮的测定方法。应用氨氮浓度较低的清洁地表水和地下水进行了方法间的比对,结果表明,对于清洁水,直接取样测定时需结合氨氮浓度水平和干扰情况选择适合的方法,必要时进行统一的前处理方能提高方法间的可比性。The accurate quantification of low concentration ammonia nitrogen in clean water has always attracted much attention,and the relevant standard methods suggest that clean water can be measured directly by sampling,so the phenomenon of incomparability between methods often occurs in the actual monitoring process.Nessler􀆳s reagent spectrophotometry,gas phase molecular absorption and ion chromatography were selected to evaluate the detection limits of each technique without pretreatment.Using clean water with low ammonia nitrogen content,the determination results under the presence of interference such as pH,chroma,turbidity,hardness,chloride ion,sodium ion and sulfide were analyzed,and then the determination method which is more suitable for low concentration ammonia nitrogen in clean water under different interference conditions was discussed.The comparison of methods between clean surface water and ground water with low ammonia nitrogen concentration was carried out.The results showed that for clean water,the appropriate method should be selected according to the ammonia nitrogen concentration level and interference conditions,and unified pretreatment should be carried out if necessary to improve the comparability of methods.

关 键 词：清洁水 低浓度氨氮 纳氏试剂分光光度法 气相分子吸收法 离子色谱法 

分 类 号：X832[环境科学与工程—环境工程]