碱性过硫酸钾消解紫外分光光度法测定总氮的影响因素分析  

Analysis of Influencing Factors for the Determination of Total Nitrogen by Alkaline Potassium Persulfate Digestion Ultraviolet Spectrophotometry

作　　者：李祺炜 LI Qiwei(Environmental Protection Monitoring Station of Chaohu Administration,Chaohu 238000,China)

机构地区：[1]巢湖管理局环境保护监测站,安徽巢湖238000

出　　处：《生物化工》2023年第2期144-147,共4页Biological Chemical Engineering

摘　　要：近年来,水中总氮的检测已成为判断水质情况的重要手段,能测定样品中溶解态氮及悬浮物中氮的总和,包括亚硝酸盐氮、硝酸盐氮、无机铵盐、溶解态氨及大部分有机含氮化合物中的氮。基于此,本文简要分析了地表水水质监测中常用的碱性过硫酸钾消解紫外分光光度法测定总氮的影响因素,包括消解时间、试剂选用、水样pH值调节、样品消解后的干扰及去除和氨氮结果高于总氮的原因分析,供相关人员参考交流。In recent years,the detection of total nitrogen in water has become an important means to judge the water quality.It can determine the sum of dissolved nitrogen in samples and nitrogen in suspended solids,including nitrite nitrogen,nitrate nitrogen,inorganic ammonium salt,dissolved ammonia and nitrogen in most organic nitrogencontaining compounds.Based on this,this paper briefly analyzes the influencing factors of the determination of total nitrogen by alkaline potassium persulfate digestion UV spectrophotometry commonly used in surface water quality monitoring,including digestion time,reagent selection,pH adjustment of water samples,interference and removal of samples after digestion,and analysis of why ammonia nitrogen results are higher than total nitrogen,which can be used as a reference for relevant personnel.

关 键 词：水质检测 总氮 紫外分光光度法 过硫酸钾 

分 类 号：X132[环境科学与工程—环境科学]