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偶氮胂-DBS系不对称双偶氮化合物,它是测定稀土的高灵敏显色剂。测定合金中铈组稀土已有报导。 本文应用该显色剂,在0.18mol/L盐酸、EDTA和抗坏血酸存在下,光度法测定黑钨矿中稀土总量。取得较好效果。 黑钨矿分析试样中,通常含有少量稀土。其成分常以轻稀土镧、铈为主,但也有些矿区试样含有显著重量稀土钇。本法在拟定的显色条件下,它们的吸光度较为一致。体系具有高的灵敏度,镧的摩尔吸光系数为1.33×10~5,比偶氮胂Ⅲ法灵敏度高2—3倍。
Arsenazo-DBS asymmetric disazo compounds, it is a highly sensitive reagent for the determination of rare earth. Determination of cerium group rare earth alloy has been reported. In this paper, the chromogenic reagent was used to determine the total amount of rare earth in wolframite by using the chromogenic reagent in the presence of 0.18mol / L hydrochloric acid, EDTA and ascorbic acid. Achieve good results. Wolframite analysis of the sample, usually containing a small amount of rare earth. Its composition is often light rare earth lanthanum, cerium-based, but some mining samples contain significant weight of rare earth yttrium. The law in the development of color conditions, their absorbance is more consistent. The system has high sensitivity. The molar extinction coefficient of lanthanum is 1.33 × 10 ~ 5, which is 2-3 times higher than that of arsenazo Ⅲ method.