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关于用空气-乙炔焰铬的原子吸收分析,1.0M高氯酸铵增加铬的吸收度约2倍。假如利用这一现象,能够完全消除10000ppm铁和19种普通阳离子(100ppm)对10ppm铬的干扰。另外,也可以用同样方法消除0.1M以下的盐酸、硝酸、高氯酸等的干扰。含于若干种钢内的铬,把试料用盐酸和过氧化氢或者王水溶解,加高氯酸铵至成约1M的浓度且进行原子吸收分析,消除共存成分的干扰而能定量。本方法的变化系数,对含铭1%的试料是0.78%。
For atomic absorption analysis with air-acetylene flame chromium, 1.0 M ammonium perchlorate increased the absorption of chromium by about 2 times. Using this phenomenon, it is possible to completely eliminate the interference of 10 ppm of chromium with 10,000 ppm iron and 19 normal cations (100 ppm). In addition, you can also use the same method to eliminate the 0.1M hydrochloric acid, nitric acid, perchloric acid and other interference. Chromium contained in several kinds of steel can be quantified by dissolving the sample with hydrochloric acid, hydrogen peroxide or aqua regia, adding ammonium perchlorate to a concentration of about 1 M and performing atomic absorption analysis to eliminate the interference of co-existing components. The coefficient of variation of this method is 0.78% for the sample containing 1% Ming.