胶束增溶分光光度法测定粉丝中微量铝含量

Determination of Trace Aluminium in Vermicelli by Micellar-Solubilized Spectrophotometry

本文以铬天青S（CAS）为显色剂、溴化十六烷基吡啶（CPB）表面活性剂为增溶剂，建立了高灵敏测定粉丝中微量铝含量的胶束增溶分光光度法．在HAc—NaAc介质中，铝、CAS和CPB形成蓝色三元配合物，其最大吸收波长为632．5nm，表观摩尔吸光系数达1．05×10^5L·mol^-1·cm^-1．铝浓度在0．2～2．8×10^-4g·L^-1范围内符合比尔定律，检测限为1．2×10^-5g·L^-1．进行加标回收实验，得到了满意的结果．

A high sensitive method for the determination of trace aluminum in vermicelli with chromazurine （CAS） as a colorific agent and cetylpyridinium bromide （CPB） as a solubilized agent was developed. A ternary blue complex was formed among Al^3＋ , CAS and CPB in HAc-NaAc buffer solution of pH 6.0 with maximum absorption wavelength at 632.5 nm. The molar absorptivity of the reactions was 1.05 × 10^5 L. mol^-1· cm^-1 The Beer law was obeyed in the concentration range of 0.02 - 0.28 mg · L ^-1 for Al^3 ＋ . The detection limit is 0. 012 mg · L ^-1. statisfactory resnh was obtained after using standard addition to do experiments.