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应用容量法测定岩石中的二氧化硅是比较普遍的,但是,在分析质量上还不够稳定。因为用氢氧化钾与过氧化钠在银(镍)坩埚中熔融矿样易发生喷溅,熔融物常“爬”出坩埚外部,易造成损失。某些矿样,如角闪斜长辉石岩,用氢氧化钾与过氧化钠熔融制成盐酸溶液后,常析出硅酸,使容量法测硅产生严重误差。用过氧化钠-碳酸钠,在银坩埚中熔融,不仅矿样不会损失,而且熔融物制成盐酸溶液后,也不易析出硅酸,保证了容量法测定硅的质量。利用上述熔矿方法,对岩石系统分析也是方便的,它能迅速分解所有矿样,而带进溶液中的杂质却不多。因此利用测硅的溶液,以原子吸收法、比色法及容量法进行铁、锰、钙、镁、铬、镍、铝及钛等元素测定,而不
The determination of silica in rock using the volumetric method is relatively common, however, but the quality of the analysis is not yet stable enough. Because potassium hydroxide and sodium peroxide in the silver (nickel) crucible melting ore prone to splashing, the melt often “crawl” out of the crucible, easy to cause damage. Some minerals, such as hornblende plagioclase rock, with potassium hydroxide and sodium peroxide melting solution made of hydrochloric acid, often precipitation of silicic acid, the volumetric method to measure silicon serious error. With sodium peroxide - sodium carbonate, melting in a silver crucible, not only the mineral will not be lost, and the melt made of hydrochloric acid solution, it is not easy precipitation of silicic acid, to ensure the capacity of the silicon method to determine the quality. It is also convenient to analyze the rock system using the above-described method of melting, which rapidly decomposes all the ore samples without much impurity introduced into the solution. Therefore, the determination of elements such as iron, manganese, calcium, magnesium, chromium, nickel, aluminum and titanium is carried out by atomic absorption spectrophotometry, colorimetric method and volumetric method,