摘要
在稀硫酸介质中,增敏剂溴代十六烷基吡啶存在下,痕量Ni(Ⅱ)对溴酸钾氧化藏花红的褪色反应有显著阻抑作用,研究了其动力学条件。据此建立了溴代十六烷基吡啶增敏阻抑动力学光度法测定痕量Ni(Ⅱ)的新方法。方法线性范围为0~400μg/L,检出限为1.42×10-7g/L。本法在表面活性剂存在下,其灵敏度提高6倍。本法快速、灵敏、操作简便,用于草药中痕量镍的测定,结果良好。
An inhibitory kinetic spectrophotometric method was proposed for the determination of trace Ni(Ⅱ). The method is based on the inhibition effect of Ni (Ⅱ) on catalyzed oxidation of Safranine T by potassium bromate in dilute sulphuric acid medium with cetyl pyridine bromide as Sensitizet and the kinetic conditions were studied. The linear range of the determination is 0-400 μg/L. The detection limit is 1.42×10^-7 g/Lo The sensitivityis increased by 6 times than in the absence of the surfactant. This method is simple, rapid and highly senstive. The method can be used for the determination of Ni(Ⅱ ) in Chinese herbal medicine with saisfactory result.
出处
《食品科技》
CAS
北大核心
2008年第11期275-278,共4页
Food Science and Technology
基金
吉林省教育厅科技计划项目[吉教科(2006)第自81号]。
关键词
溴代十六烷基吡啶
阻抑
动力学分光光度法
藏花红
溴酸钾
镍(Ⅱ)
Cetyl pyridine bromide(CPB)
Inhibitory
Kinetic spectrophotometry
Safranine T
Potassium bromate
Nickel(Ⅱ)