土壤中微量钒的分光光度测定方法研究——1-(2-吡啶偶氮)-2-萘酚-过氧化氢-十二烷基苯磺酸钠法  

Photomtric determination of trace amounts of vanadium in soil by the color reaction with 1-(2-pyridylazo)-2-naphthol sensitized reagent

作　　者：白贯荣[1] 成杰民[1] 陈雪兰[1] 

机构地区：[1]山东师范大学人口资源与环境学院,山东济南250014

出　　处：《中国土壤与肥料》2012年第5期94-97,共4页Soil and Fertilizer Sciences in China

基　　金：国家公益项目20110922(盐渍土壤石油-重金属复合污染修复技术及示范)

摘　　要：对钒(V)和1-(2-吡啶偶氮)-2-萘酚(PAN)-过氧化氢-十二烷基苯磺酸钠(SDBS)显色反应进行了试验,结果表明:在1 mol.L-1盐酸介质中,在SDBS存在下,钒与1-(2-吡啶偶氮)-萘酚和过氧化氢生成红色的多元络合物,络合物最大吸收波长为575 nm,表观摩尔吸收率为3.64×104L.mol-1.cm-1,钒的浓度在0.2～1.2μg.mL-1内符合比耳定律。络合物的组成比为n钒∶nPAN∶n过氧化氢=1∶1∶1。该方法用于土壤中钒的测定,测定值的相对偏差(n=20)均小于6%,回收率为100.4%～105.6%。Abstract： The color reaction conditions of vanadium with 1- （2-pyridylazo） -2-naphthol （PAN） were researched, and a new method was developed for the determination of vanadium in soil. It was based on the fact that vanadium forms a stable complex with PAN and hydrogen peroxide in an acidic medium of 1 tool · L -1 HC1 and in the presence of sodium dodecyl- benzene sulfonate （SDBS） as sensitization agent. The maximum absorption of the complex was 575 nm with apparent molar absorptivity of 3.64 × 104 L · mol^-1 · cm^-1 The linear range of the method was 0. 2 - 1.2 μg·mL^-1. Beer＇s law was kept in the concentration range within 1.2 μg·mL^-1 of vanadium. The proposed method was used for determination of va- nadium in 4 samples of soil. The recoveris of vanadium in different levels were 100.4% - 105.6%. With RSD of no more than 6%.

关 键 词：光度法 钒 1-(2-吡啶偶氮)-萘酚 十二烷基苯磺酸钠(SDBS) 

分 类 号：X833[环境科学与工程—环境工程] O657.3[理学—分析化学]