摘要
研究了新显色剂2 (四氮唑偶氮) 5 二乙氨基苯甲酸(简称TTZDBA)的合成。经元素分析、红外光谱、紫外光谱、核磁共振谱等方法测试确定其组成和结构。研究了试剂的性质及其与钒的显色反应的条件,建立了光度法测定钒的新方法。在pH3.5的HAc NaAc介质中,TTZD BA与V(Ⅴ)形成摩尔比为2∶1的紫红色配合物,配合物至少稳定18h,其最大吸收波长在566nm处,表观摩尔吸光系数为3.52×104L·mol-1·cm-1,V(Ⅴ)质量浓度在0～0.8mg/L内遵守比尔定律。经标样分析验证,结果与标准值相符,加标回收率为101.3%～102.8%,RSD(n=6)在1.0%～2.5%。所拟方法可不经分离直接测定铝合金样品及合成废水中的钒。
A method for the determination of vanadium by spectrophotometry has been developed. The conditions of color reaction of a new reagent of 2(tetrazolylazo)5diethylaminobenzoic acid(TTZDBA)with vanadium(Ⅴ)are studied.The results show that the new color reagent reacts with vanadium and forms a stable purple red complex in the medium of HAcNaAc (pH 3.5). The apparent molar absorptivity is 3.52×104 L·mol-1·cm-1 and the maximum absorption wavelength is at 566 nm. Beer′s law is obeyed in the range of 0～0.8 mg/L for V(Ⅴ).The method has been applied to the direct determination of vanadium in an aluminium alloy sample and a synthetic water sample with satisfactory results. The recovery of standard addition is 101.3%～102.7% with precision of 1.0%～2.5% RSD(n=6).
出处
《岩矿测试》
CAS
CSCD
北大核心
2003年第1期40-43,共4页
Rock and Mineral Analysis
基金
浙江省教育厅计划课题(20020003)
