高温氯化钛精矿制备四氯化钛时所得收尘渣(简称“高温氯化收尘渣”)中钪含量有时高达200ppm以上,颇具开发价值。研究其分离与测定,将为综合利用作出一定贡献。本法基于在pH2.5—3.5范围内甲基百里酚蓝(MTB,黄色,λ_(max)~R=455nm)与Sc~(3+)形成蓝色络合物,在乙醇溶液中,于波长615nm处有最大吸收,ε=2.5×10~5,Sc~(3+)浓度在0—10微克/25毫升范围内遵守比尔定律。在25毫升显色液中,小于10微克的 High-temperature titanium chloride concentrate titanium tetrachloride obtained when the resulting dust collection residue (referred to as “high-temperature chlorinated dust collection residue”) scandium content sometimes as high as 200ppm or more, quite a development value. Research on its separation and determination, will make some contribution to comprehensive utilization. This method is based on the formation of blue complexes of methyl thymol blue (MTB, yellow, λ max (R) = 455 nm) with Sc 3+ in the pH range of 2.5-3.5, Maximum absorption at 615nm, ε = 2.5 × 10 ~ 5, Beer’s law is obeyed in the range of 0 ~ 10μg / 25ml. In 25 ml of color developing solution, less than 10 micrograms