| 铬天青S分光光度法测定粉条中的铝 |
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| 引用本文： | 曹金朋,郑清林.铬天青S分光光度法测定粉条中的铝[J].现代仪器,2010,16(2). |
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| 作者姓名： | 曹金朋 郑清林 |
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| 作者单位： | 北京普析通用仪器有限责任公司分析中心,北京,101200 |
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| 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(Al-CAS-CPB-Triton X-100)四元显色体系进行测定。结果表明,在混合表面活性剂CPB-Triton X-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610mm,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。
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| 关 键 词： | 铝 铬天青S 分光光度法 粉条 |
Spectrophotometric determination of aluminum in vermicelli with chrome azurol S |
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| Abstract: | 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. |
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| Keywords: | Aluminum Chrome azurol S Spectrophotometry Vermicelli |
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