| Triton X-100-5-Br-PADAP分光光度法选择性测定乳粉中微量铁 |
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| 引用本文： | 连国军,陈希贤,李东,方芳,谢作叙,曹建明.Triton X-100-5-Br-PADAP分光光度法选择性测定乳粉中微量铁[J].福建分析测试,2000(4). |
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| 作者姓名： | 连国军 陈希贤 李东 方芳 谢作叙 曹建明 |
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| 作者单位： | 温州医学院分析中心，温州医学院分析中心，温州医学院分析中心，温州医学院分析中心，温州医学院分析中心，温州医学院分析中心 温州 325027，温州 325027，温州 325027，温州 325027，温州 325027，温州 325027 |
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| 摘 要： | 报道了以2-(5-溴-吡啶偶氮)-5-二乙氨基酚(5-Br-PADAP)为显色剂,应用分光光度法高选择性测定铁(Ⅲ)的新方法。实验结果表明,在pH4.0的乙醇介质中和Triton X—100、盐酸羟氨存在下,以746nm为测定波长,可选择性测定铁(Ⅲ)含量。本法线性范围为0～1.3μg/ml,表观摩尔吸收系数为2.94×10~4L·mol~(-1)·cm~(-1),批内和批间精密度cv%分别为1.2%、2.3%,平均回收率为98.9%。已用于乳粉中微量铁的直接测定,常见共存成分对测定无干扰。
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| 关 键 词： | 5-Br-PADAP 分光光度法 铁 |
Studies on the spectrophotometric determination of microamounts of iron with 5-Br-PADAP-Triton X-100 |
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| Lian Guojun,Chen Xixian,Li Dong et al..Studies on the spectrophotometric determination of microamounts of iron with 5-Br-PADAP-Triton X-100[J].Fujian Anal Ysis & Testing,2000(4). |
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| Authors: | Lian Guojun Chen Xixian Li Dong |
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| Abstract: | A new spectrophotomtric method has been developed for the highly selective determination of iron (Ⅲ) with 5-Br-PADAP in CH_3CH_2OH medium at pH4. 0 and in the presence of Triton X-100 and NH_2OH, HC1. Iron (Ⅲ) can be selectively determined at the wavelength of 746 nm. The calibration curve is liner in a concentration range of 0～1. 2μg/ ml, the apparent molar absorptivity 2. 94±10~4 L·mol~(-1)·cm~(-1), the coefficient of variation of within-run and between-day respectively were 1.2% and 2.3%, the average rate of recovery 98.9%. The method has been applied to the direct determination of iron in milk powder, common coexistent metal ions don't interfere with the determination. |
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| Keywords: | 5-Br-PADAP Spectrophotonmetry Iron |
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