Co-H_2O_2-4,5-二溴邻硝基苯基荧光酮催化动力学光度法测定痕量钴(Ⅱ)  

DETERMINATION OF TRACE COBALT(Ⅱ) BY DBON-PF CATALYTIC KINETIC SPECTROPHOTOMETRY

作　　者：刘利平[1] 其木格[2] 阿娟[1] 

机构地区：[1]内蒙古农业大学理学院,呼和浩特010018 [2]内蒙古商贸职业学院工程系,呼和浩特010070

出　　处：《内蒙古农业大学学报（自然科学版）》2012年第1期240-242,共3页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

摘　　要：本文研究了Co(Ⅱ)在氢氧化钠介质中催化过氧化氢氧化4,5-二溴邻硝基苯基荧光酮(DBON-PF)褪色的新指示反应及影响反应速度的因素,建立了测定痕量钴的催化动力学光度新方法。方法检出限为8.5×10-12g/mL,Co(Ⅱ)含量在0ng/10mL～3.2ng/10mL范围内符合比尔定律,是光度法测定钴的高灵敏体系之一,本法选择性好,灵敏度高,应用于VB12中钴的测定,相对标准偏差为2.8%～3.4%,加标回收率为96%～104%,符合痕量分析的要求。Cobalt（ Ⅱ ） in NaOH can catalyze the discolouring oxidation of 4,5 - dibromo - o - nitrophenylfluorone （ DBON - PF） by H2O2. a new catalytic spectrophotometric method for determining trace cobalt（ Ⅱ） was established. Factors affecting the speed of reac- tion are investigated. The detection limit of the method is 8.5 x 10 -12 g/mL. Beera law is obeyed for cobalt （ Ⅱ ） in the range of 0 -3.2 ng/10mL . The method has high sensitivity and selectivity. This method has been used in the determination of trace cobalt （ Ⅱ） in VBIz and the relative standard deviation is 2.8% - 3.4% and the recovery standard addition is 96% - 104%. the results obtained ful- filled the trace analysis requirements .

关 键 词：钴(Ⅱ) 4 5-二溴邻硝基苯基荧光酮(DBON-PF) 催化动力学光度法 

分 类 号：O657.32[理学—分析化学]