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样品用盐酸、过氧化氢溶解,在pH=5.5的弱酸性中,铅、锌与二甲酚橙形成红色络合物,二价铅,二价锌颜色的深度与浓度成正比。一铅的测定试剂邻菲啰啉:0.25%乙醇溶液: 铅底液:称取金属铜0.38克、金属锌0.10克、金属锡50毫克及金属镍5.0毫克于250毫升锥形烧杯中,加25毫升盐酸(1+1),5～10毫升双氧水溶解,煮沸,驱除过剩的双氧水,冷却。以水稀释至500毫升量瓶中,摇匀;
The sample was dissolved in hydrochloric acid and hydrogen peroxide. At pH = 5.5, the complex of lead and zinc with xylenol orange formed a red complex, and the depth of divalent lead and divalent zinc color was proportional to the concentration. Determination of a lead reagent phenanthroline: 0.25% ethanol solution: lead liquid: Weigh 0.38 g copper, 0.10 g zinc metal, 50 mg tin metal and 5.0 mg nickel metal in 250 ml conical beaker, add 25 Ml hydrochloric acid (1 + 1), 5 to 10 ml of hydrogen peroxide dissolved, boiled, get rid of excess hydrogen peroxide, cooled. Diluted with water to 500 ml volumetric flask, shake;