3,5-二溴-PADAP-Triton X-100分光光度法测定微量钒  

Spectrophotometric Determination of Micro Amounts of Vanadium with 3,5-Br_(2)-PADAP and Triton X-100

作　　者：沈含熙[1] 李惠民[2] Shen Hanxi;Li Huimin

机构地区：[1]南开大学化学系 [2]地矿部天津地质矿产研究所

出　　处：《岩矿测试》1986年第3期179-182,I0002,共5页Rock and Mineral Analysis

摘　　要：吡啶偶氮染料是测定钒的高灵敏显色剂。以吡啶偶氮染料—过氧化氢(或羟胺)为显色剂的混配络合物测定钒以及用非离子表面活性剂增敏的分光光度法在文献上均已有报道。本文对比了三种吡啶偶氮染料在非离子表面活性剂或过氧化氢存在下与钒的显色反应。发现钒-3,5-二溴-PADAP-Triton X-100显色体系有较高的选择性和灵敏度。因此进行了详细的研究,并应用于岩矿分析,取得了良好的效果。A simple,sensitive and selective method for the spectrophotometric determination of trace vanadium has been developed.Sensitization action of Triton X-100 on the colour reaction of 3,5-Br_(2)-PADAP with vanadium and reaction conditions of the complex formation have been studied.In the presence of Triton X-100 the vanadium complex exhibits maximum absorption at 609nm with a molar absorptivity of 6.7×10^(4)L·mol^(-1)cm^(-1).A broad optimum reaction acidity ranges from 2.0 to l.Omol L^(-1)H_(2)SO_(4).The molar ratio of vanadium to 3,5-Br_(2)-PADAP in the complex remains 1:1.This method is applicable to the determination of vanadium in rocks.

关 键 词：吡啶偶氮 分光光度法 显色体系 混配络合物 非离子表面活性剂 显色反应 岩矿分析 PADAP 

分 类 号：O65[理学—分析化学]