【摘要】 氯磺酚 S是光度法测铌的最佳试剂之一 ,选用 71 7型阴离子交换树脂富集试液中铌与氯磺酚 S的配合物 ,用自行设计的反射散射附件与 72 2型分光光度计联用直接测定树脂相上的反射散射值 AR,设计了一种新的固相反射散射光度法。并将方法用于低合金钢、化探样、磁铁矿样品中低含量铌的测定 ,取得较好的效果。更多还原

【Abstract】 A solid phase reflective diffusion photometric method for the determination of niobium is studied in this paper. Chlorosulfophenol S is used as a chromogenic reagent for Nb(Ⅴ), and the complex formed in a HCl tartaric acid medium is adsorbed on a definite amount of 717 anion exchange resin. The reflective absorbance A R of the anion exchange resin is then determined at a wavelength of 630nm using a self made reflective diffusion accessory installed with the 722 spectrophotometer. The method has been used in the determination of niobium in the alloy steel and in geological samples with satisfactory results.更多还原