论文部分内容阅读
在燃烧热的测定过程中,较重要的一环就是要知道燃烧后的产物是什么,这样方可对燃烧热作出正确的校正。对于仅含碳、氢、氧、氮的化合物,用静止弹燃烧量热器即可准确测出燃烧热,但一般都认为氮全部转化为HNO_3,故不作HNO_2校正。由于氧气的来源、操作过程、燃烧样品各异,作者发现弹液中含有精确实验不可忽略的HNO_2。本文介绍用对氨基苯磺酸和N,N-二甲基苯胺作显色剂的分光光度法,它具有灵敏度高,显色稳定,变异系数小,操作方便的特点。
In the combustion heat measurement process, the more important part is to know what the product is after combustion, so as to correct the heat of combustion. For compounds containing only carbon, hydrogen, oxygen and nitrogen, the heat of combustion can be used to measure the heat of combustion accurately, but it is generally accepted that all of the nitrogen is converted to HNO3, so no HNO2 correction is made. Due to the origin of oxygen, the operation process, and the combustion samples, the authors found that the bomb contains HNO 2 that can not be neglected by an accurate experiment. This article describes the use of p-aminobenzenesulfonic acid and N, N-dimethylaniline as a color reagent spectrophotometry, it has high sensitivity, color stability, small coefficient of variation, easy to operate features.