5-Br-PADAP-树脂相分光光度法测定铁矿中的铌  

5-Br-PADAP-RESIN SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM IN IRON ORES

作　　者：彭姝丽[1] 何久康 

机构地区：[1]内蒙古大学化学系

出　　处：《分析化学》1989年第3期266-268,共3页Chinese Journal of Analytical Chemistry

摘　　要：Nb-5-Br-PADAP-酒石酸体系光度法测铌已有报道,本文应用树脂相分光光度法对铁矿中微量铌的测定进行了研究。实验表明,Nb-5-Br-PADAP-酒石酸三元混合配合物,在pH=1.0时,吸附于树脂上呈蓝紫色,最大吸收波长为620nm,摩尔吸光系数为2.9×10⁵L·mol^-1·cm^-1,Nb₂O₅含量在0-30μg/25ml范围内符合比尔定律。此法的灵敏度和选择性均高于常规比色法,我们用饱和酒石酸浸取矿样熔块。A ternary blue-violet complex of Nb with 5-Br-PADAP and tartaric acid (pH1.0) was adsorbed and determined on resin. The maximum absorption wavelength is at 620nm. The molar absorptivity is 2.9×10~5L·mol^(-1)·cm^(-1) and Beer's law is obeyed for 0—30μg/25ml of Nb_2O_5. This method is more sensitive and selective than the usual spectrophotometry. Especially, Nb can be determined directly without separating and masking.

关 键 词：铁矿 铌 分光光度法 树脂相 PADAP 

分 类 号：P578.292[天文地球—矿物学]