污水氨氮测定中蒸馏预处理方法改进及与AA3连续流动分析法的比较  

Improvement of Distillation Pretreatment Method in the Determination of Ammonia Nitrogen in Wastewater and Comparison with the AA3 Continuous Flow Analysis

作　　者：夏维达 蒋思丝 李银 李月娥 Xia Weida;Jiang Sisi;Li Yin;Li Yuee(Central analysis section Jiangsu Suzhou Environmental Monitoring Center,Suzhou 215000,China)

机构地区：[1]江苏省苏州环境监测中心中心分析科,江苏苏州215000

出　　处：《广东化工》2020年第5期189-191,共3页Guangdong Chemical Industry

摘　　要：纳氏试剂分光光度法广泛应用于污水氨氮的测定,以硼酸作吸收液进行预蒸馏处理可有效去除各种干扰,但在实际操作中预蒸馏后的样品测定结果偏差较大,文章提出将纯水代替硼酸作为吸收液的改进方法,样品测得结果具有较好的准确度和精密度。改进后的纳氏试剂分光光度法和AA3连续流动分析法进行比对测试,无显著性差异。测定<1 mg/L的低浓度水样时连续流动法测定结果要比纳氏试剂改进蒸馏分光光度法略低。Nessler’s reagent spectrophotometry is widey uesd in measurement of amm onia nitrogen in wastewater.Using boric acid as absorption solution for distillation pretreatment can effectively remove all kinds of interferences,but the deviation of sample determination results after distillation is large in practical operation.In this paper,a new modified pretreatment method with pure water as absorbent is presented.The results of sample measurement have good accuracy and precision.There was no significant difference between the improved Nessler reagent spectrophotometry and AA3 continuous flow analysis.The results of continuous flow method are slightly lower than that of modified distillation spectrophotometry when the concentration of water is less than 1 mg/L.

关 键 词：氨氮 蒸馏预处理 AA3连续流动分析法 废水 

分 类 号：TQ[化学工程]