ISO 1232:1976 主要用于制铝的氧化铝.二氧化硅含量的测定.还原钼硅酸盐分光光度法

标准编号：ISO 1232:1976

中文名称：主要用于制铝的氧化铝.二氧化硅含量的测定.还原钼硅酸盐分光光度法

英文名称：Aluminium oxide primarily used for the production of aluminium — Determination of silica content — Reduced molybdosilicate spectrophotometric method

发布日期：1976-09

标准范围

该方法适用于二氧化硅含量在0.005%（m/m）和0.025%（m/m）之间的产品，前提是五氧化二磷和五氧化二钒的含量不超过0.02%（m/m）。该方法的原理基于在酸度、试剂浓度、温度和时间等明确条件下形成氧化硅钼酸盐（黄色）。在高酸性硫酸介质和酒石酸存在下选择性还原络合物。在波长约为815 nm时还原有色络合物的分光光度测量。-取代ISO建议R 1232-1970。

The method is applicable to products having a silica content between 0.005 % (m/m) and 0.025 % (m/m) provided that the content of phosphorus pentoxide plus vanadium pentoxide does not exceed 0.02 % (m/m). The principle of the method is based on the formation of oxidized molybdosilicate (yellow) under well-defined conditions of acidity, concentration of reagents, temperature and time. Selective reduction of the complex in a highly acidic medium of sulphuric acid and in the presence of tartaric acid. Spectrophotometric measurement of the reduced coloured complex at a wavelength of about 815 nm. - Replaces ISO Recommendation R 1232-1970.

标准预览图