姚家瑜, 朱腾, 李敏. 稀土硅镁合金中稀土总量的测定——偶氮胂Ⅲ分光光度法[J]. 工程科学学报, 1988, 10(1): 107-112. DOI: 10.13374/j.issn1001-053x.1988.01.017
引用本文: 姚家瑜, 朱腾, 李敏. 稀土硅镁合金中稀土总量的测定——偶氮胂Ⅲ分光光度法[J]. 工程科学学报, 1988, 10(1): 107-112. DOI: 10.13374/j.issn1001-053x.1988.01.017
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Yao Jiayu, Zhu Teng, Li Min. Spectrophotometric Determination of Total Amount of Rare Earth Elements in the Ferroalloy of Containing Rare Earth Silicon and Magnesium with Arsenazo-Ⅲ[J]. Chinese Journal of Engineering, 1988, 10(1): 107-112. DOI: 10.13374/j.issn1001-053x.1988.01.017
Citation: Yao Jiayu, Zhu Teng, Li Min. Spectrophotometric Determination of Total Amount of Rare Earth Elements in the Ferroalloy of Containing Rare Earth Silicon and Magnesium with Arsenazo-Ⅲ[J]. Chinese Journal of Engineering, 1988, 10(1): 107-112. DOI: 10.13374/j.issn1001-053x.1988.01.017
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稀土硅镁合金中稀土总量的测定——偶氮胂Ⅲ分光光度法

Spectrophotometric Determination of Total Amount of Rare Earth Elements in the Ferroalloy of Containing Rare Earth Silicon and Magnesium with Arsenazo-Ⅲ

    摘要
  • 摘要: 在水-乙醇介质中,稀土与偶氮胂Ⅲ在pH为1.2~2.1的酸度范围内可形成1:2的紫红色络合物,摩尔吸光系数高达8.2×104l·mol·cm-1,含稀土总量为0~50μg/25ml范围内服从比尔定律。铁的干扰采用EDTA掩蔽,避免了复杂的分离手续。该方法具有较高的灵敏度,选择性、重现性良好,用于稀土硅镁合金中稀土总量的测定,分析结果满意,已用于生产。

     

    Abstract: A rapid sensitive and selective spectrophotometric method for the determination of total amount of the rare earth elements in the ferroalloy of containing rare earth silicon and magnesium has been developed. A purplish red complex which has ratio of RE to Arsenazo-Ⅲ to be 1:2 can be formed in the range of pH 1.2~2.1 in the ethanol aqueous solution (λmax=648nm,λ648=8.2×104 mol-1cm-1). Beer's law is obeyed in the concentration range of 0 to 50μg/25ml.The interference of Fe(Ⅲ) can be covered with EDTA.

     

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