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本文研究了作者自己合成的新显色剂,对—碘偶氮氯膦[2-(4-氯-2-膦酸基苯偶氮)-7-(4-碘苯偶氮)-1,8-二羟基萘-3,6-二磺酸],与稀土元素的反应条件。在0.02—0.24NHCl介质中,该试剂与稀土反应立即形成兰色络合物,可稳定24小时。轻稀土络合物最大吸收波长为682nm,重稀土络合物最大吸收波长则移至672nm。络合物的平均摩尔吸光系数为9.76×10!~4mol~(-1)·cm~(-1),稀土含量在0—12μg/25ml范围内服从比耳定律。在H_2C_2O_4—Na_4P_2O_7(或NH_4F)介质中,能消除大量的Fe~(3+)以及约20种阳离子的干扰。方法用于测定钢铁中的稀土总量,得到了满意的结果。
In this paper, the authors developed a new color reagent synthesis of p-iodo-chlorophosphonazo [2- (4-chloro-2-phosphonophenylazo) -7- (4- iodophenylazo) 8-dihydroxynaphthalene-3,6-disulfonic acid], reaction conditions with rare earth elements. In 0.02-0.24N HCl medium, the reagent reacts with the rare earth to form a blue complex and stabilizes for 24 hours. The maximum absorption wavelength of light rare earth complexes is 682nm, and the maximum absorption wavelength of heavy rare earth complexes is shifted to 672nm. The average molar absorptivity of the complex was 9.76 × 10 ~ 4mol -1 cm -1, and the rare earth content was within the range of 0-12μg / 25ml. In H_2C_2O_4-Na_4P_2O_7 (or NH_4F) medium, a large amount of Fe 3+ and about 20 kinds of cations can be eliminated. The method was used to determine the total amount of rare earths in steel, and satisfactory results were obtained.