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本文采用硅钼蓝正戊醇萃取光度法测定高纯铝中痕量硅,以1-氨基-2荼酚-4磺酸为还原剂,还原时间需12分钟(5-30℃),颜色可稳定1.5小时,以正戊醇萃取硅钼蓝时,溶液酸度在2.9-4.5N时能获得较好的萃取率,且吸光度恒定,铝量大于0.5克使结果偏低,取样量应控制在0.2-0.25克。测定结果表明,含硅量在1×10_(-3)-2× 10_(-5) ％准确度能满足要求,回收率也较好,方法比较快速。分析方法: (1)碱溶样法:称取0.25克试样于塑料烧杯中,用带刻度塑料吸管准确加入10N氢氧化钠5
In this paper, silicon molybdenum blue n-amyl alcohol extraction spectrophotometric determination of trace silicon in high-purity aluminum to 1-amino-2 Flavanol-4 sulfonic acid as a reducing agent, the reduction time required 12 minutes (5-30 ℃), the color can be Stable 1.5 hours to n-amyl alcohol extraction of molybdenum blue, the solution acidity at 2.9-4.5N get better extraction rate, and constant absorbance, the amount of aluminum is greater than 0.5 grams so that the result is low, the sample size should be controlled at 0.2 -0.25 grams. The results show that the silicon content of 1 × 10 _ (-3) -2 × 10 _ (- 5)% accuracy can meet the requirements, the recovery rate is also better, the method is faster. Analysis: (1) alkali solution method: Weigh 0.25 grams of the sample in a plastic beaker, with a graduated plastic pipette accurately added 10N sodium hydroxide 5