萘酚绿B-Na_2S_2O_8抑制动力学光度法测定铼  

Naphthol green B-sodium persulfate catalytic kinetic spectrophotometry determination of trace rhenium

作　　者：屈佳[1] 樊雪梅[1,2] 

机构地区：[1]商洛学院化学工程与现代材料学院,商洛726000 [2]商洛市材料科学工程院,商洛726000

出　　处：《分析仪器》2015年第3期15-18,共4页Analytical Instrumentation

基　　金：陕西省科技统筹创新工程计划项目(2012KTDZ02-02);陕西省尾矿资源综合利用重点实验室项目(14SKY-FWK06);商洛市科技局计划项目(SK-2014-4)资助

摘　　要：基于铼抑制Na2S2O8氧化萘酚绿B的褪色反应,结合紫外-可见分光光度法,建立了测定铼的新方法。确定了抑制体系的动力学条件,并计算了抑制反应的表观活化能Ea=84.65KJ/mol,反应速率常数K=1.95×10^-4/s。在最佳实验条件下,铼的浓度在0.2-16.00mg/L范围内与相对吸光度呈良好的线性关系,检出限为6.0μg/L。用于钼矿焙烧烟尘中铼含量的测定,相对标准偏差为2.1%-2.9%,标准加入回收率为95.0%-104%,结果令人满意。Based on the coloring reaction of Naphtol green B oxidized by sodium persulfate in the medi‐um of pH 6 .47 phosphate buffer solution inhibited by rhenium ,a new kinetic spectrophotometric method for the determination of trace amounts of rhenium was proposed. The dynamic conditions of the catalytic system was determined and the inhibition reaction apparent activation energy and the reaction rate constant was calculated ,respectively ,Ea=84.65 KJ/mol and K=1.95 × 10^-4/s. Under the optimal conditions ,the rhenium concentration showed a good linear relationship with the absorbance in the 0.2 16.00 mg/L range ,the detection limit was 6.0ug/L. The method has been used for the determination of rhenium in roasting chim‐ney of molybdenum minerals. The relative standard deviation was 2.1% 2.9% and the recoveriy was 95.0% 104.0% with satisfactory .

关 键 词：紫外-可见分光光度法 Na2S2O8 萘酚绿B 高铼酸铵 

分 类 号：O657.3[理学—分析化学]