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作为精钒(含V_2O_5为98％以上)中杂质成份的硅含量常达到万分之几到十万分之几的数量级。因此,如果仍沿用钼蓝法水相测硅则在灵敏度上已不能满足要求;况且,大量钒的存在也要影响硅的测定。为此,欲测定纯钒溶液中的硅时,需先将硅从大量钒中分出并富集后才能测定。如дорохова等用二正辛胺的甲苯溶液将硅钼黄从钒溶液中苯取分离,在富集后的有机相内比色测定;冯渝清、郭春山则用甲基异丁酮萃取硅钼黄,使硅与钒分离,在有机相中用二氯化锡还原成硅钼蓝后比色测定。
As a fine vanadium (containing V_2O_5 98% or more) in the silicon content of impurities often reach a few ten thousandths of an order of magnitude. Therefore, if still follow the molybdenum blue method of water phase silicon measurement in the sensitivity has been unable to meet the requirements; Moreover, the presence of a large number of vanadium should also affect the determination of silicon. Therefore, to determine the silicon in pure vanadium solution, it is necessary to separate and enrich the silicon from a large amount of vanadium before it can be measured. Such as дорохова and other n-octylamine toluene solution of molybdenum silicon molybdenum from the vanadium solution benzene to be separated in the enrichment of the organic phase colorimetric determination; Feng Yuqing, Guo Chun Shan is methyl isobutyl ketone extraction molybdenum silicon yellow , The silicon and vanadium separation, in the organic phase with tin dichloride reduction of silicon molybdenum blue colorimetric determination.