热分析法观测Na_2CrO_4熔点  

DETERMINATION OF MELTING POINT OF ANHYDROUS SODIUM CHROMATE BY DIFFERENTIAL THERMAL ANALYSIS

作　　者：武克忠[1] 贾振斌[1] 赵睿新[2] 

机构地区：[1]河北师范大学化学系,石家庄050016 [2]山西财经大学管理工程系

出　　处：《理化检验（化学分册）》2001年第5期198-199,201,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在现有文献中收录的Na2 CrO4 熔点数据各不相同 ,有 792℃、392℃ ,两者相差 4 0 0℃左右。利用热分析法观测Na2 CrO4 熔点 ,确定其熔点应为 792℃。并且在 4 19.6℃存在着一个可逆的固 固相变 ,转变焓为 148.6J·g-There are two different values of melting point of anhydrous sodium chromate recorded in the present literatures, i.e. 792℃ and 392℃, having a difference of 400℃. As a verification, a differential thermal analysis is done, and a melting point of 792℃ is found. It is also found that there is a reversible solid solid phase transition at 419.6℃ with a transition enthalpy of 148.6J·g -1 .

关 键 词：差热分析 无水铬酸钠 熔点 测定 纯度 

分 类 号：TQ131.12[化学工程—无机化工] O657.91[理学—分析化学]