铬天青S分光光度法测定粉条中的铝  

Spectrophotometric determination of aluminum in vermicelli with chrome azurol S

作　　者：曹金朋[1] 郑清林[1] 

机构地区：[1]北京普析通用仪器有限责任公司分析中心,北京101200

出　　处：《现代仪器》2010年第2期42-43,54,共3页Modern Instruments

摘　　要：研究以铬天青S为显色剂测定粉条中铝含量的分光光度法。采用铝．铬天青S-溴化十六烷基吡啶-曲拉通X-100（AI—CAS—CPB．TritonX．100）四元显色体系进行测定。结果表明，在混合表面活性剂CPB．TritonX-100存在下，Al与CAS在HAc—NaAc介质中形成蓝紫色配合物，测定波长为610nm，在0．4-160mg／kg范围内符合比尔定律，其线性相关系数为0．9996，摩尔吸收系数达到7．5×10^4L／mol／cm，实际样品测定的回收率为95．1％-109．5％，相对标准偏差在5.2％以内。该法的线性相关性较好，灵敏度较高，操作简便，可用于粉条等食品中铝含量的测定。A spectrophotometric method was studied for the determination of aluminum in vermicelli with Chrome azurol S （CAS）. A color system of Al-CAS-CPB-Triton X-100 was used. In the medium of mixed surfactants of CPB-Triton X-100, Al reacted with CAS to form a stable violet-blue complex at pH6.0-6.4. The molar absorptivity was 7.5×10^4L/mol/cm at 610nm and Beer＇s law was obeyed in the range of 0.4-160mg/kg with R^2=0.9996. The recoveries were 95.1%-109.5% and the relative standard deviation （RSD） was less than 5.2%. The method has good relativity and sensitivity, and thus suitable for the determination of aluminum in vermicelli.

关 键 词：铝 铬天青S 分光光度法 粉条 

分 类 号：O647.2[理学—物理化学]