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不对称变色酸双偶氮溴膦类显色剂是近年来研制成的一类新颖显色剂,用于测定稀土总量、铈组稀土和钇组稀土,具有灵敏度高、对比度大、稳定性和选择性好等特点。本文研究了偶氮溴膦-mB(BPA-mB)与钇的络合反应条件及其应用。在pH 1.4～2.0的盐酸介质中,试剂与钇形成稳定的蓝紫色络合物(ε=8.33×10~4),用于测定镁钇合金中的钇,可不经分离,也不需加入特殊的掩蔽剂而直接进行测定。试验部分一仪器与试剂 721型分光光度计;751 型分光光度计 PHS-2型酸度计钇标准溶液:10μg ml~(-1),用氧化钇(99.99%)按
Asymmetric chromogenic acid disazo brominated phosphine reagent is developed in recent years, a new class of reagent, for the determination of the total rare earth, rare earth cerium group and rare earth yttrium group, with high sensitivity, high contrast, stability And good selectivity and other characteristics. In this paper, the complexation conditions of azobisphosphine-mB (BPA-mB) with yttrium and its application were studied. The reagent and yttrium form a stable blue-purple complex (ε = 8.33 × 10 ~ 4) in hydrochloric acid medium of pH 1.4 ~ 2.0 for the determination of yttrium in magnesium yttrium alloy without separation or addition of special Of the masking agent and directly measured. Test Part 1 Apparatus and Reagent 721 Spectrophotometer; Model 751 PHS-2 pH Meter Yttrium Standard Solution: 10 μg ml -1 Yttrium Oxide (99.99%) Press