摘要
在β-环糊精存在下,根据铬催化溴酸钾氧化罗丹明B的褪色反应,建立了测定痕量铬的新方法.实验结果表明:方法的最大吸收波长为575 nm,铬量在0.007~0.27 mg/L范围内符合比尔定律,表观摩尔吸光系数为1.95×105L.mol-1.cm-1.用于钢样中铬含量的测定,结果与认定值吻合.
A new catalytic spectrophotometric method for the determination of trace chromium(Ⅵ) was developed based on the oxidation of rhodamine B with potassium bromate catalyzed by chromium(Ⅵ) in the present of β-cyclodextrin.The result showed that the maximum absorbance wave length is at 575 nm.The beer’s law is obeyed in the range of 0.007-0.27 mg/L with apparent molar absorption of 1.95 × 105 L·mol^(-1)·cm^(-1).The proposed method was applied to determination of trace chromium(Ⅵ) in steel samples and the results are agreement with certified values of samples.
出处
《信阳师范学院学报(自然科学版)》
CAS
北大核心
2012年第1期103-105,共3页
Journal of Xinyang Normal University(Natural Science Edition)
基金
国家教育部留学归国人员科研启动基金项目(2009-36-1341)
关键词
铬
催化动力学光度法
Β-环糊精
chromium(Ⅵ); catalytic photometry; β-cyclodextrin