Determination of vanadium(V) based on its ternary complex with 2-(8-quinolylazo)-4,5-diphenylimidazole and hydrogen peroxide by high performance liquid chromatography

2011 International Symposium on Water Resource and Environmental Protection Pub Date : 2011-06-16 DOI:10.1109/ISWREP.2011.5893600

Chengjie Zhang, Jing Liu, B. Yao, Luo-hong Zhang

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引用次数: 3

Abstract

A method based on reversed-phase high performance liquid chromatographic separation in combination with spectrophotometric detection was developed for the determination of trace amounts of vanadium(V) as its ternary complex with 2-(8-quinolylazo)-4,5-diphenylimidazole (QAI) and hydrogen peroxide. Spectral and chromatographic behaviors of the ternary complex were investigated. The complex was formed in weekly acidic medium (pH 2.5-4.0) and separated on a Cosmosil 5C8-MS column with 58% (m/m) aqueous acetonitrile mobile phase containing 5.0 × 10-3 mol kg-1 acetate buffer (pH 3.5), 1.0 × 10-4 mol kg-1 tetrabutylammonium bromide and 1.0 × 10-3 mol kg-1 ethylenediaminetetraacetic acid and detected at 595 nm. The calibration curve was linear up to 35 ng for vanadium(V) in 25.0 mL of test solution at 0.001 absorbance unit full scale. The detection limit was 2 pg for vanadium(V) with 100 L injection. The method showed good accuracy, selectivity and sensitivity for the determination of vanadium(V) in environmental samples.

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高效液相色谱法测定2-(8-喹啉偶氮)-4,5-二苯咪唑和过氧化氢三元配合物中钒的含量

建立了以2-(8-喹啉偶氮)-4,5-二苯基咪唑(QAI)和过氧化氢为溶剂的钒(V)三元配合物的反相高效液相色谱分离-分光光度法测定痕量钒的方法。研究了三元配合物的光谱和色谱行为。该配合物在周酸性培养基(pH 2.5-4.0)中形成，在Cosmosil 5C8-MS色谱柱上分离，色谱柱为58% (m/m)的乙腈水流动相，其中含有5.0 × 10-3 mol kg-1醋酸缓冲液(pH 3.5)、1.0 × 10-4 mol kg-1四丁基溴化铵和1.0 × 10-3 mol kg-1乙二胺四乙酸，在595 nm处检测。在0.001吸光度单位满量程下，在25.0 mL测试溶液中，钒(V)的校准曲线在35 ng以下呈线性。进样量为100 L时，钒(V)的检出限为2 pg。该方法对环境样品中钒的测定具有良好的准确度、选择性和灵敏度。

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2011 International Symposium on Water Resource and Environmental Protection

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