EXTRACTION AND SPECTROPHOTOMETRIC DETERMINATION OF MICROGRAM AMOUNTS OF NIOBIUM(V)

被引：0

作者：

KESHAVAN, B

KRISHNAPRASAD, KP

机构：

来源：

INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY | 1991年 / 30卷 / 03期

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D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Niobium forms a mixed ligand yellow complex with promethazine hydrochloride (PH) in the presence of thiocyanate at room temperature in hydrochloric acid medium. The ternary complex exhibits maximum absorbance at 400 nm. Its molar absorptivity is 2.72 x 10(4) 1 mol-1 cm-1. Beer's law is valid over the concentration range 0.2-3.0 ppm. The composition of the complex is 1:1:2 (metal:ligand:thiocyanate). The reagent has been used successfully for the spectrophotometric determination of niobium in ores.

引用

页码：299 / 300

页数：2