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试剂1.硫酸铍溶液:称取 BeSO_4·4H_2O19.7克,加水溶解,加1:1硫酸20毫升,用水稀释至1升;2.六次甲基四胺溶液:30%;3.二甲酚橙指示剂:称0.1克与100克硝酸钾和匀;
Reagents 1. Beryllium sulfate solution: Weigh BeSO_4 · 4H_2O19.7 grams, dissolved in water, add 1: 1 sulfuric acid 20 ml, diluted with water to 1 liter; 2. Six times the methyl amine solution: 30%; 3. Dimethyl Phenol orange indicator: Weigh 0.1 g and 100 g of potassium nitrate and uniform;