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贵榴石(铁铝石榴石)、云母系高硅、高铁、高铝化合物。本文以碱熔样;钼蓝差示光度法测定硅;磺基水杨酸光度法测定铁;二甲酚橙光度法测定铝。方法快速,结果符合生产要求。试验部分一试剂与仪器钼酸铵溶液:5%(如有沉淀应过滤),草酸-硫酸混合酸:将8N硫酸与4%草酸溶液按1:3体积混合。硫酸亚铁铵溶液:5%,每100毫升溶液中加硫酸(1+1)5毫升。磺基水杨酸溶液:20% 缓冲液:pH3.0,醋酸- 醋酸钠体系。称取结晶醋酸钠25克溶于200毫升水中,加冰醋酸280毫升,以水稀至1000毫升。二甲酚橙溶液:0.1% 铜试剂:10%,用时现配。
Precious garnet (iron aluminum garnet), mica Department of high silicon, high-speed rail, high-aluminum compounds. In this paper, alkali melting sample; molybdenum blue photometric method for the determination of silicon; sulfosalicylic acid photometric method for the determination of iron; xylenol orange photometric method for the determination of aluminum. Fast method, the results meet the production requirements. Experimental part A reagent and equipment ammonium molybdate solution: 5% (if precipitation should be filtered), oxalic acid - sulfuric acid mixed acid: 8N sulfuric acid and 4% oxalic acid solution by 1: 3 volume mixing. Ferrous ammonium sulfate solution: 5% sulfuric acid (1 + 1) 5 ml per 100 ml solution. Sulfosalicylic acid solution: 20% buffer: pH 3.0, acetic acid - sodium acetate system. Weigh 25 grams of crystalline sodium acetate dissolved in 200 ml of water, add glacial acetic acid 280 ml diluted with water to 1000 ml. Xylenol orange solution: 0.1% copper reagent: 10%, when used with the current.