一媒中氮的定量: 煤中氮的测定具有相当意义,在决定煤的组成以及在燃料燃燒过程的研究上都須应用到。已往化学分析常采用杜氏及凱氏法,现今以常量的凱氏法的应用较普遍,苏联亦以此列入国家标准。但在分解试样及蒸餾上費时多,而且材料又很费,故对于操作法的研究还值得探討。过去有人在常量的基础上有某些改进,但不能滿足工业及科学研究上飞跃前进的需要。煤样虽然极不均一,但在采取150孔篩时的顆粒,可以获得煤质的代表性,因此采用半微量法,不但設备简单,而且易于操作;加以适当的配合蒸解试剂,合理地提高温度,加速蒸解可以获得一般半微量 A Medium Nitrogen Quantitation: Determination of nitrogen in coal is of considerable significance and must be applied in determining the composition of coal and in the combustion of the fuel. In the past, chemical analysis often used Duchenne and Kjeldahl methods. Nowadays, the application of constant Kjeldahl method is common, and the Soviet Union also included it as a national standard. However, it takes time and labor to decompose the sample and the distillation, and the material is very expensive. Therefore, the research on the operation method is also worth exploring. In the past, some people made some improvements on the basis of the constant, but they failed to meet the needs of leaps and bounds in industrial and scientific research. Although the coal sample is extremely heterogeneous, it can obtain the representation of coal quality when taking the 150-mesh sieve. Therefore, the semi-micro method not only has the advantages of simple equipment but also easy operation. It should be properly combined with the steaming reagent to reasonably improve Temperature, accelerated steaming can be generally semi-trace