铌-溴酸钾-偶氮氯膦-mA催化光度法测定痕量铌  

Catalytic kinetic spectrophotometric determination of trace niobium

作　　者：冯尚彩[1] 韩长秀[1] 

机构地区：[1]山东临沂师范学院化学与环境科学系,临沂276005

出　　处：《分析试验室》2004年第8期69-71,共3页Chinese Journal of Analysis Laboratory

摘　　要：在稀H2SO4介质中,铌灵敏催化KBrO3氧化偶氮氯膦 mA的褪色反应,据此建立了催化动力学光度法测定铌的新方法。线性范围为5～30ng mL,检出限0.292ng mL。本法已用于矿石试样中微量铌的测定。A new catalytic method for the determination of trace niobium was developed with spectrophotometry. It was based on the catalytic effect of Nb(Ⅴ) on the oxidation of chlorophosponazo-mA by potassium bromate in sulphuric acid medium. The linear range of (Nb(Ⅴ)) was 5～30 ng/mL, and the detection limit was 0.292 (ng/mL). The method was applied to the determination of niobium in ore samples with satisfactory results.

关 键 词：铌 催化动力学光度法 偶氮氯膦-MA 

分 类 号：O657.32[理学—分析化学]