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金属硅的生产是采用电炉熔炼,往往由于铜瓦打火等因素,会突然增加产品中铜的含量,特别是在生产特级硅时,会影响产品的等级。据一些资料介绍,低含铜量多采用BCO比色法。我们以此为据,进行了金属硅中铜含量的BCO比色法的试测工作。二环已酮草酰双腙(简写BCO)试剂在水溶液中随PH值不同而发生互变异构作用,当PH<3时,它以酮式存在;当PH7—10时,它以烯醇Ⅰ式存在;当PH>10时,则以烯醇Ⅱ式存在。只有烯醇Ⅰ式才能与二价铜离子生成稳定的兰色络合物;显色最适宜的酸度为
Metal silicon production is the use of electric smelting, often due to copper sparks and other factors, will suddenly increase the copper content of products, especially in the production of super-grade silicon, will affect the product level. According to some information, low copper content using BCO colorimetric method. Based on this, we carried out the BCO colorimetry test for copper content in metallic silicon. Biscyclohexanone oxalylbis hydrazone (abbreviated BCO) reagent tautomerizes with varying pH in aqueous solution and exists as a ketone when PH <3; when PH7-10, it starts with enol Ⅰ exists; when PH> 10, then enolase Ⅱ exists. Only the enol type I can form a stable blue complex with divalent copper ions; the most suitable acidity for color development is