微乳液增敏对硝基苯基荧光酮光度法测定人发中痕量镍

Spectrophotometric Determination of Trace Nickel with p-Nitrophenylfluorone in Microemulsion after Preconcentration and Separation by Sulfhydryl Dextrane Gel

中文关键词:  微乳液  对硝基苯基荧光酮  镍  人发  分离富集  光度法

英文关键词:microemulsion  p-nitrophenylfluorone  nickel(Ⅱ)  human hair samples  preconcentration and separation  spectrophotometry

中文摘要:

      研究了微乳液介质中,在pH等于10.4时,镍与对硝基苯基荧光酮(p-NPF)显色生成稳定的1:3配合物,在600nm处摩尔吸光系数为1.64×10⁵L/(mol·cm),镍含量在0～0.7μg/mL范围内符合比耳定律,采用巯基葡聚糖凝胶分离富集,消除了共存离子的干扰,用所拟方法测定人发中的痕量镍,结果令人满意.

英文摘要:

      The color reaction of nickel with p-nitrophenylfluorone (p-NPF) in microemulsion has been studied. Nickel (Ⅱ) reacts with p-NPF to form a stable 1:3 complex at pH 10.4. Its apparent molar absorptivity is 1.64×10⁵L/(mol·cm) at 600 nm. Beer's law is obeyed in the range of 0～0.7 μg/mL. The coexistent metal ions can be separated and nickel can be enriched by sulphydryl dextrane gel (SDG), greatly improving the selectivity and sensibility of system. The method is used to determine trace amount of nickel in human hair samples with satisfactory results.