【摘要】 研究了钐 (Ⅲ )—DBC -偶氮氯膦—磷酸—EDTA新体系光度法测定贵金属合金中的微量钐。反应体系生成蓝色络合物的λmax=6 5 0nm ,灵敏度高 ,其摩尔吸光系数ε =1 77× 10 5 ,钐在 0～ 30 μg/ 2 5mL范围内符合比尔定律 ,方法选择性高 ,适应性广 ,用于分析银合金中钐 ,相对标准偏差RSD≤ 2 8%。更多还原

【Abstract】 In order to determine micro samarium in the precious metal alloys,a new color reaction of Sm? with DBC-chlorophosphonazo,phosphoric acid and EDTA has been studied A stable blue complex is formed in the reaction system λ max =650nm,ε=1 77×10 5. Beer’s law is obyed in the range of 0-30μg/25mL for Sm?. This method has been successfully applied to the determination of Sm in silver alloys,S≤0 011,RSD≤2 8% It has good selectivity and suitabitity更多还原