偶氮氯膦-DBC光度法测定银合金中镨  

PHOTOMETRIC DETERMINATION OF PRASEODYMIUM IN SILVER ALLOYS WITH CPA-DBC

作　　者：宋焕云[1] 吴瑞林[1] 

机构地区：[1]昆明贵金属研究所,昆明650221

出　　处：《理化检验（化学分册）》2001年第2期68-69,72,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：研究提出镨 ( ) - DBC-偶氮氯膦 -磷酸 - EDTA新体系光度法测定贵金属合金中微量镨。反应体系生成 α型蓝色配合物的 λmax=650 nm,灵敏度高 ,摩尔吸光系数 ε=0 .93× 1 0 5L·mol-1·cm-1,镨浓度在 0～ 50 μg/2 5ml范围内符合比耳定律 ,方法选择性强 ,有较好的适用性 ,用于分析银合金中镨 ,标准偏差 S≤ 0 .0 1 1 ,相对标准偏差 RSD≤ 1 .97%。A new color reaction of Pr(Ⅲ) with chlorophosphonazo DBC using EDTA as complexing reagent was studied. A stable blue colored complex is formed in a dilute phosphoric acid medium. Its absorption maxima lies at 650nm with a molar absorptivity of 9.3×10 4L·mol -1 ·cm -1 . Beer′s law holds over the range of 0~50μg/25ml. This method has been applied successfully to the determination of micro amounts of praseodymium in silver alloys. The standard deviation ( S ) and RSD of the method are found to be 0.010 and 1.97%. The method is proved to be of high sensitivity and selectivity.

关 键 词：DBC-偶氮氯膦 镰 光度法 银合金 分析方法 

分 类 号：TG146.32[一般工业技术—材料科学与工程] TG115.325[金属学及工艺—金属材料]