摘要
用差热天平分析国产亚甲基兰试剂，发现亚甲基兰在１２１℃前分两步失去吸附术和结晶水；１２１℃以后开始发生明显的热氧化降解．比较了四种脱水温度后确认，１２０±３℃下烘至恒重是制取无水亚甲兰比较合适的实验条件．直接根据热失重曲线确定样品的含水率，方法简便、快速，再现性好、能够排除氧化降解的干扰，比较准确．并对ＡＰＩ称样公式的校正问题作了讨论．
Through the analysis of the methylene blue agent in differential thermal balance,the author in this paper observes that below 121℃ the dehydration process of both absorbed water and crystal water in the agent are carried out in two steps,and above 121℃ there occurs the degradation of the thermal oxidation.After a comparative study of four temperatures in dehydration,the author further suggests that the constant weight of the sample in 120±3℃ is an ideal condition to produce waterless methylene blue,and the thermo-analysis curve is the basis to directly determine the moisture content of the sample.The method is simple and convenient, with a good reapearance and a relatively quick and accurate elimination of the disturbance of the thermaloxidation.The author also discusses the calibration of the formula for API balance sample.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
1994年第4期40-46,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
脱水
亚甲基兰
热分析
含水率
氧化降解
Dehydration
Methylene blue
Thermal analysis
Moiusture content
Oxidation
Degradation
