【摘要】 在０．２４ｍｏｌ·Ｌ－１Ｈ３ＰＯ４介质中，铅与二溴对甲基偶氮磺形成１∶２蓝色配合物，最大吸收波长在６３０ｎｍ，表观摩尔吸光系数为７．９９×１０４Ｌ·ｍｏｌ－１·ｃｍ－１．铅量在０－２０μｇ／２５ｍＬ内符合比耳定律．方法应用于铜合金中微量铅的测定，结果满意．更多还原

【Abstract】 A spectrophotometric method for the determination on lead with a new chromogenic reagent dibromo p methylsulfonazo is studied. In 0.24 mol·L -1 H 3PO 4 medium, lead reacts with the reagent to form a blue complex which has a composition of 1∶2 and exhibits an absorption maximum at 630 nm with a molar absorptivity of 7.99×10 4L·mol -1 ·cm -1 . Beers law is obeyed for 0-20μg of lead in 25mL of solution. The method has been applied to the determination of micro amounts of lead in copper alloys with satisfactory results.更多还原