CAJ | 학술논문

纳氏试剂分光光度法测定水质氨氮时受到多种因素的干扰,直接影响分析的质量。为解决这一系列问题,采取相应的质量控制措施,试验表明：纳氏试剂应冷藏;絮凝沉淀采取静置沉淀或离心,取上清液测定即可;玻璃器皿先用酸性洗剂浸泡洗涤;采室外平行样时先用玻棒搅拌;＂比色前稀释＂和＂比色后稀释＂相对误差和相对偏差均满足分析要求;水样进行蒸馏预处理时,馏出液体积在120 mL时即可;显色时间在10～30 min之间为宜;室温在20～25℃之间较好;水样经加酸酸化保存,在样品测定时先将pH调至中性。
납씨시제분광광도법측정수질안담시수도다충인소적간우,직접영향분석적질량。위해결저일계렬문제,채취상응적질량공제조시,시험표명：납씨시제응랭장;서응침정채취정치침정혹리심,취상청액측정즉가;파리기명선용산성세제침포세조;채실외평행양시선용파봉교반;＂비색전희석＂화＂비색후희석＂상대오차화상대편차균만족분석요구;수양진행증류예처리시,류출액체적재120 mL시즉가;현색시간재10～30 min지간위의;실온재20～25℃지간교호;수양경가산산화보존,재양품측정시선장pH조지중성。
There were many factors interferred the determination of ammonia and nitrogen in water with Nessler＇s reagent spectrophotometry method,which directly affected the quality of the analysis.In order to solve the problems,corresponding quality control measures were adopted.Experiment showed that Nesster＇s reagent should be refrigerated,flocculating sedimentation should take quiet place precipitation or centrifugal,and take only supernatant aslo do.Glass vessels with acidic detergent for first washing,in outdoor parallel samples,stirred with a glass rod first,the relative error and deviation of dilution before colorimetric and dilution after colorimetric met the analysis requirement.Water samples can be preprocessed distillation,when liquid volume 120 mL,color time 10~30 min and in 20~25 ℃,the result was better.The water samples saved by acidification,and pH was neutral before determing.