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偶氮硝膦-mB是一个新希土显色剂,它在强酸介质中,能以草酸为掩蔽剂,在重希土(Dy→Lu,Y)存在下直接测定轻希土。反应发色迅速,试剂与络合物甚为稳定。铈的摩尔吸光系数达7.1×10~4 1·mol~(-1)·cm~(-1),在0～15μg 25ml~(-1)范围内符合比耳定律。尤为突出的是,该试剂具有优良的选择性,各种常见离子的允许量大大超过同类试剂。本文拟订的方法测试了以铬、铝、锰含量较高的合金钢作基体的合成样品,取得了满意的结果。
Azo-nitronium phosphine-mB is a new Xitai developer, which can be directly detected in the presence of heavy rare earth (Dy → Lu, Y) with light oxalic acid in a strong acid medium with oxalic acid as a masking agent. Fast reaction color, reagents and complexes is very stable. The molar extinction coefficient of cerium reached 7.1 × 10 -4 1 · mol -1 cm -1, and Beer’s law was in the range of 0 ~ 15 μg 25 ml -1. Particularly prominent is that the reagent has excellent selectivity, a variety of common ions allows much more than similar reagents. The method proposed in this paper tested the synthetic samples with alloy steel with high content of Cr, Al and Mn as matrix, and achieved satisfactory results.