流动注射催化光度法测定微量钒  

Determination of trace Vanadium by flow injection catalytic-kinetic spectrophotometry

作　　者：柴红梅[1] 高楼军[1] 刘艳[1] 强凤珍 

机构地区：[1]延安大学化学与化工学院,延安716000

出　　处：《分析试验室》2008年第1期50-52,共3页Chinese Journal of Analysis Laboratory

基　　金：陕西省教育厅(SJG0503);延安大学科研基金(YD2004126)项目资助

摘　　要：采用流动注射与催化动力学光度法相结合，研究了在H3PO4介质中微量钒（Ⅴ）催化溴酸钾氧化吡啶偶氮变色酸试剂-2-（5-硝基-2-吡啶偶氮）-1，8-二羟基萘-3，6二磺酸（简称5-NO2-PACA）褪色反应，建立了测定微量钒的新方法。该方法线性范围为0．02～0．20μg／mL，线性回归方程为：AA=-0．004＋2．63p（μg／mL），相关系数r=0.9988，检出限为：4.1×10^-6g／L。方法已用于水样中微量钒的测定。A new method is developed for the detenninetion of trace vanadium by flow-injection catalytic-kinetic spectrophotometry. It is based on the catalytic effect of Ⅴ（ Ⅴ ） on the redox reaction between 2-（5-nitro-2-pyridylazo）-1,8- dihydroxynaphthalene-3,6-disulfonic acid （5-NOE-PACA） and potassium bromate in phosphoric acid. This method is easy to be operated and quick. The linear range of determination is 0.2 ～ 2.2 μg/mL and the linear regression equation is AA = - 0. 004 ＋ 2. 631ρ（μg/mL） with correlation cofficient r of 0. 9988. The detection limit is 4.1 ×10^-6 g/L. The method has been used for the determination of trace vanadium in water samples with satisfactory results.

关 键 词：5-NO2-PACA 钒 流动注射 催化光度法 

分 类 号：O657.32[理学—分析化学]