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随着生产的发展,对难熔金属及其合金中氮的测定提出更高的要求。目前多采用蒸馏法分离主体,用萘斯勒试剂进行比色,这种方法存在着流程长,对试剂和水的纯度要求高,以及灵敏度较低的缺点。气相色谱法、微压法和微量杜马定氮法,由于燃烧炉温度的限制,也给分析难熔金属中氮带来很大的困难。应用百里酚(Thymol)测定氮,近年来国外有许多报导,方法基于在pH为10.5右左的溶
With the development of production, higher requirements are put forward for the determination of nitrogen in refractory metals and their alloys. At present, the main method is to separate the bulk by distillation and colorimetric with the Rietzler reagent. This method has the disadvantages of long process, high purity of reagent and water, and low sensitivity. Gas chromatography, micro-pressure and trace amounts of Duma nitrogen method, due to the temperature of the combustion furnace, but also to analyze the nitrogen in refractory metals brings great difficulties. Nitrogen determination using thymol has been reported abroad for many years. The method is based on a solution of