新试剂2-(5-碘-2-吡啶偶氮)-5-二甲氨基苯胺 分光光度法测定矿石中的钴
Spectrophotometric Determination of Cobalt in Ores with a New Regent 2-(5-Iodine-2-Pyridylazo)-5-Dimethylaminoaniline
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摘要: 对新试剂2-(5-碘-2-吡啶偶氮)-5-二甲氨基苯胺(5-I-PADMA)与钴(Ⅱ)的显色反应进行试验。结果表明,在pH为4.2~9.2时,钴(II)与试剂形成1∶2红紫色配合物,配合物有两个吸收峰,分别位于554 nm和602 nm处;钴配合物形成后非常稳定,当以无机酸酸化,由于质子化作用,配合物转化成另一种具有较高吸收特性绿蓝色稳定的双质子化型体,其吸收峰分别红移至568 nm和614 nm,适宜的酸浓度范围分别为:0.3~7.0 mol/L 盐酸、0.3~6.0 mol/L 高氯酸、0.3~4.2 mol/L硫酸和0.7~7.3 mol/L磷酸。配合物表观摩尔吸光系数ε614 nm为1.21×105 L/(mol·cm)。钴含量在0~0.5 μg/mL内遵循比尔定律。方法简便,快速,且具有良好的选择性,已成功地应用于矿样中微量钴的测定,结果满意。
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关键词:
- 2-(5-碘-2-吡啶偶氮)-5-二甲氨基苯胺 /
- 钴 /
- 矿石 /
- 分光光度法
Abstract: High sensitive color reaction of a new reagent of 2-(5-iodine-2-pyridylazo)-5-dimethylaminoaniline (5-I-PADMA) with cobalt (Ⅱ) has been studied. In pH 4.2~9.2 medium, 5-I-PADMA reacts with cobalt (Ⅱ) to form a violet-red complex exhibiting two absorption peaks at 554 nm and 602 nm respectively. This complex can be changed into another stable blue-green diproton species after acidification with mineral acids, and the two absorption peaks shift to 568 nm and 614 nm respectively. This species possesses a higher absorption characteristic. The optimal acidification conditions were found to be 0.3~7.0 mol/L HCl, 0.3~6.0 mol/L HClO4, 0.3~4.2 mol/L H2SO4 and 0.7~7.3 mol/L H3PO4, respectively. The apparent molar absorptivity ε614 nm is 1.21×105 L /( mol· cm). Beer's law is obeyed in the range of 0~0.5 μg/mL for Co. The method provides high sensitivity, high selectivity and less interference. The method has been successfully applied to the determination of cobalt in ores with satisfactory results.-
Keywords:
- 2-(5-iodine-2-pyridylazo)-5-dimethylaminoaniline /
- cobalt /
- ore /
- spectrophotometry
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