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铬钨合金铸铁的炉前薄片样,试验室用“HCl+H_2O_2、HCl+HF、HCl+HNO_3、HCl+……”等常规溶解方法都不能使其快速溶解.试用“磷酸高温溶解”的办法,可以达到快速(2～4分钟)而又完全溶解的目的,分析速度比原来常规方法缩短半小时,提高工效数倍,可以满足炉前需要.1.铬的测定:试样加入5ml磷酸于高温处加热溶解,滴加数滴硝酸破坏碳化物,再加入10ml高氨酸冒烟至瓶口,以下按“硫酸亚铁铵容量法测定.
Chromium tungsten alloy cast iron stove before the sample, laboratory with “HCl + H_2O_2, HCl + HF, HCl + HNO_3, HCl + ... ...” and other conventional dissolution methods can not make it quickly dissolved.Piloting the “high temperature phosphoric acid solution” approach, Can achieve fast (2 ~ 4 minutes) and completely dissolved purpose, the analysis speed is shorter than the original conventional method for half an hour to improve work efficiency several times, can meet the needs of the front of the furnace.1.Calcium determination: Sample adding 5ml of phosphoric acid at high temperature Department heating dissolved, dropping a few drops of nitric acid damage carbides, and then add 10ml of high-ammonia smoke to the bottle mouth, the following "ammonium ferrous sulfate volumetric determination.