无水硝酸中N_2O_4和N_2O_5含量的分析  

Two Methods for Analyzing N_2O_4 and N_2O_5 in Anhydrous HNO_3

作　　者：张静[1] 王莅[1] 苏敏[1] 张香文[1] 米镇涛[1] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《含能材料》2006年第1期62-65,共4页Chinese Journal of Energetic Materials

摘　　要：采用滴定法和滴定与核磁共振(NMR)谱相结合的方法分析了N2O4N2O5HNO3体系各组分的含量,并对滴定法和滴定与NMR谱相结合法的分析结果进行了比较,研究了不同的氧化剂、取样方式以及不同的溶剂对分析结果的影响。结果表明滴定法和滴定与核磁共振光谱相结合法分析N2O4N2O5HNO3体系是可行的。硫酸铈作为氧化剂较高锰酸钾作为氧化剂的分析结果准确度高;安瓿球取样较移液管取样分析结果准确;纯水作为溶剂较氢氧化钠作为溶剂的分析结果的重现性好、准确度高。The concentrations of tetroxide dinitrogen （N2O4 ）and pentoxide dinitrogen（ N2O5 ） and nitric acid in N2 O4-N2O5-HNO3 system are measured by the chemical titration and the nuclear magnetic resonance spectra （NMR）combining titration,respectively. And its results from two methods were compared. The effects of the oxidants,the solvents and the sampling methods on the concentrations of N2O4 ,N2O5 analyzed by the chemical titration were also investigated. The results indicate that both the NMR combining titration and titration are in agreement and accurate for the analysis of N2O4-N2O5-HNO3 system. N2O4 concentrations analyzed by using cerium suffate as oxidant are more accurate than that of potassium hypermanganate as oxidant. The results of sampling by using ampoule ball are better than that of sampling by using pipette. Comparing with the aqueous solutions of sodium hydroxide as solvent to analyze N2O5 concentration,distilled water used as solvent gives the higher accuracy and the better repeatability.

关 键 词：分析化学 五氧化二氮 四氧化二氮 化学滴定 核磁共振谱 

分 类 号：O655.4[理学—分析化学]