Determination of NH4+ and NO3- in salt-water system by distillation—acid-base titration
YANG Hai-tang1,2, ZENG De-wen*1,2, YAO Yan3
1.College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2.Key Laboratory of Resource Chemistry of Nonferrous Metals, Central South University, Changsha 450083, China; 3.Qinghai Institute of Salt Lakes, Chinese Academy of Scienes, Xining 810008, China
Abstract：The traditional analysis method faced great challenges due to the highprecision requirement of solubility data in watersalt system. In this study, the sampling, distillation equipment and titration of traditional distillation acidbase titration method (national standard method) were improved. The content of NH4Cl-H2O、Mg(NO3)2-H2O、CaCl2-NH4Cl-H2O and MgCl2-NH4Cl-H2O systems was determined using the improved method. The results showed that the determination error of NH4+ and NO3- was within 0.1 % and 0.15 %, respectively. The improved distillation acidbase titration was also suitable for the accurate determination of total nitrogen content (nitrogen in ammonium and nitrogen in nitrate) in inorganic chemical products, except application for the determination of NH4+ or NO3- in above-mentioned system.
阳海棠，曾德文，姚燕. 蒸馏—酸碱滴定法测定水盐体系中NH4+和NO3-含量[J]. 冶金分析, 2012, 32(5): 23-28.
YANG Hai-tang, ZENG De-wen, YAO Yan. Determination of NH4+ and NO3- in salt-water system by distillation—acid-base titration. , 2012, 32(5): 23-28.
［4］OUYANGHai-tang,ZENGDe-wen,ZHOUHong-yan,etalSolubilityoftheternarysystemLiCl+NH4Cl+H2O［J］.JournalofChemical&EngineeringData,2011,56(4)：1096-1104［5］LIBi-hai,ZENGDe-wen,YINXia,etalTheoreticalpredictionandexperimentaldeterminationofroom-temperaturephasechangematerialsusinghydratedsaltsasagents［J］.Journal of Therm.Anal.Calorim.,2010,100：685-693
