分光光度法测定金合金中的钆、钇  

Spectrometrical Determination of Gadolinium and Yttrium in Gold Alloys

作　　者：安中庆[1] 朱利亚[1] 金娅秋[1] 王应进[1] 李光俐[1] 李永兰[1] 管有祥[1] 

机构地区：[1]贵研铂业股份有限公司,昆明贵金属研究所,云南昆明650106

出　　处：《贵金属》2010年第1期21-24,28,共5页Precious Metals

基　　金：国家标准化技术委员会行业标准制(修)订项目(NO.2003065)

摘　　要：建立了测定金合金中Gd、Y质量分数的偶氮氯膦Ⅲ分光光度法，研究了基体金的还原条件和提高测定方法选择性的条件。结果表明：亚硫酸可完全还原金，并对Gd（Ⅲ）、Y（Ⅲ）无吸附影响；加入EDTA可提高方法的选择性，一定量常见金属离子不干扰测定；在0．1mol／L盐酸介质中，体系的最大吸收峰为λmax=673nm、λmax=672nm，表观摩尔吸光系数ε673^Gd=6．37×10^4L·mol^-1·cm^-1、占ε672^Y=7．01×10^4L·mol^-1·cm～，Gd（Ⅲ）、Y（Ⅲ）的质量浓度分别在0～50μg／50mL、0～40μg／50mL符合比尔定律，加标准回收率分别为99．80％～100．40％、99．80％～100．30％，测定质量分数为0．6％的Gd、Y，相对标准偏差为0．004％、0．005％。方法选择性好、操作简便、易于掌握，应用于金合金中Gd、Y质量分数的测定，结果满意。A spectrophotometry for the determination of gadolinium and yttrium content in gold alloys using chlorophosphonazo Ⅲ as a chromogenic agent was proposed. The conditions of reductive gold and im- proving selectivity of the method were established. Results indicated that the gold could be reduced with sulfurous acid and had no effect on adsorption of gadolinium and yttrium. The selectivity of the method can be remarkably improved by addition of EDTA and a certain amount of metal ions had no interference. The maximum adsorotion wavelenGths of the svstem are λmax = 673 nm and λmax = 672 nm, and the appar-ent molar adsorptivity is ε673^Gd =6.37 ×10^4 L · mol^-1· cm^-1 ,ε672^Y =7.01× 10^4 L · mol^-1 · cm^-1 The linear range, recovery of standard addition and relative standard deviation for gadolinium and yttrium are 0 -50 μg/50 mL,0 -40 μg/50 mL, 99.80% - 100.40% 99.80% - 100.30% and 0. 004% , 0. 005% for determination of 0. 6% content, respectively. The proposed method has good selectivity with convenient operation, and it has applied to determination of gadolinium and yttrium content with satisfactory resuits.

关 键 词：分析化学 分光光度法 金合金 钆 钇 

分 类 号：O657.32[理学—分析化学]