摘要
研究了在硫酸介质中，铼催化碲酸和氯化亚锡的氧化还原反应速率，建立了催化动力学光度法测定痕量铼的方法，优化了高铼酸钾-柠檬酸-碲酸钠-聚乙烯醇-二氯化锡反应的实验条件；测定了催化反应的表观活化能Ea’=15．87kJ／mol和表观速率常数K’=1．28×10^-3s^-1，铼含量在0．004～1．2μg/mL范围内服从比尔定律．回归方程y=0．129cμg／10mL＋0．0163；相关系数r=0．997；应用于钼灰、钼精砂等矿样中铼的测定，测定结果的RSD≤±5％（n=5），加标回收率为98．0％～100．1％（n=5），符合实用性要求．
The method for the determination of trace amounts of rhenium by catalytic-kinetics spectrophotometry is established based on Re（ Ⅶ ） catalytic Na2TeO4-SnCl2 oxidation-reduction reaction rate in acidic medium. The experimental conditions are improved by KReO4- Citric acid-Na2TeO4- PVA-SnCl2 reaction system. The apparent activation energy is Ea＇= 15.87 kJ/mol and the constant of reaction rate is K＇ = 1.28×10^-3s^-1, and Beer＇s Law was obeyed in the range of 0. 004- 1.2μg/mL. The regression equation is y = 0. 129 cμg/10 mE ＋ 0. 016 3 with a correlation of r = 0. 997. The method has been applied to the determination of rhenium in molybdenum mine samples, and RSD ≤ ± 5 % （ n = 5）, with recovery of 98.0% - 100.1% （ n = 5）.
出处
《分子科学学报》
CAS
CSCD
北大核心
2009年第3期220-222,共3页
Journal of Molecular Science
基金
国家自然科学基金资助项目(20271024)
辽宁省创新团队项目基金资助项目(2008T064)
关键词
铼
催化反应
分光光度法
钼矿
rhenium
catalytic reaction
spectrophotometry
molybdenum mine
