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用空气—乙炔火焰原子吸收光谱法测定矿物、岩石中的铭,国内外已有不少工作报导。曾研究提出的方法中,有采用硫酸钠、硫酸钠—硫酸铍、氟氢化铵等作为干扰抑制剂来克服共存元素对测定铬的影响。但是,对于铝土矿中大量铝的干扰,却难于用一般剂量的抑制剂来清除。根据铝土矿的特点,本文提出,矿样经碱分解后,使Cr(Ⅵ)于酸性介质被浓集于极少量(湿基1克)的国产阴离子交换树脂上而与大量铝等共存元素分离,
Air - acetylene flame atomic absorption spectrometry determination of minerals, rocks in the Ming, at home and abroad have been a lot of work reported. Among the methods studied, sodium sulphate, sodium sulphate - beryllium sulphate and ammonium bifluoride were used as interference inhibitors to overcome the influence of coexisting elements on the determination of chromium. However, the interference with a large amount of aluminum in bauxite is difficult to remove with a typical dose of inhibitor. According to the characteristics of bauxite, this paper proposed that after the alkali decomposes, the Cr (¢ ö) concentrates in a very small amount of anion exchange resin (1 g wet basis) Isolated,