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对硝基偶氮氯膦(简称CPApN)[2-(4-氯-2膦酸基苯偶氮-7-(4-硝基苯偶氮)-1,8-二羟基3,6-萘-二磺酸],在酸性溶液中与稀土元素钇形成蓝绿色的β型络合物。本实验在EDTA-Zn掩蔽剂的存在下,用CPApN直接测定钢铁中的钇,可得到满意的结果。实验部分一仪器及试剂 751型分光光度计,1cm比色皿。 CPApN溶液:0.02%;单个稀土标准液:10μg ml~(-1)。 EDTA-Zn溶液:0.1M,称取EDTA 37.2g,加少量水,加热,加NaOH(20%)30ml使之溶解;另称取ZnO 8.1g,加少量水,加高氯酸20ml溶解。二
P-nitro-chlorophosphonazoles (abbreviated CPApN) [2- (4-chloro-2 phosphonobenzene azo- 7- (4-nitrophenylazo) -1,8-dihydroxy 3,6- naphthalene -disulfonic acid], forming a blue-green β-type complex with yttrium in the acidic solution.In this experiment, direct determination of yttrium in steel with CPApN in the presence of EDTA-Zn masking agent gave satisfactory results Experimental part of an instrument and reagents 751 spectrophotometer, 1cm cuvette. CPApN solution: 0.02%; a single rare earth standard solution: 10μgml ~. EDTA-Zn solution: 0.1M, weighed EDTA 37.2g , Add a small amount of water, heat, add NaOH (20%) 30ml to dissolve; the other said take ZnO 8.1g, add a small amount of water, add 20ml of perchloric acid dissolved.