过渡金属离子辅助的钒光化学蒸气发生  

Transition metal ions assisted photochemical vapor generation for vanadium

作　　者：宁永艳 董亮 高英[1] NING Yongyan;DONG Liang;GAO Ying(Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学,四川成都610059

出　　处：《中国测试》2025年第2期81-87,共7页China Measurement & Test

基　　金：国家自然科学基金面上项目(41973019)。

摘　　要：该文发现基于过渡金属离子辅助的钒(V)光化学蒸气发生(Photochemical vapor generation,PVG)体系。研究发现在紫外光的照射下,在甲酸(Formic acid,FA)溶液中加入Cu^(2+)、Co^(2+)和Fe3+等过渡金属离子对V的光化学还原具有促进作用,其中Cu^(2+)效果最佳。在20 mg/L Cu^(2+)的存在下,V的信号强度提升约10倍。该文详细考察影响V光化学还原的主要参数,包括增敏剂的种类和浓度、紫外辐射波长和时间、低分子质量有机酸的种类和浓度、气液界面、载气流速和共存离子干扰。在20%(v/v)FA、20 mg/L Cu^(2+)和25 s光照的条件下,利用电感耦合等离子体质谱(Inductively coupled plasma mass spectrometer,ICP-MS)进行测定,V的方法检出限为3.7μg/L。经过7次重复测定200μg/L的V标准溶液,得到该方法的精密度为4.2%。利用紫外-可见分光光度计(UV-vis spectrophotometer,UVvis)和气相色谱-质谱(Gas chromatography-mass spectrometry,GC-MS)研究Cu^(2+)辅助V的PVG反应机理,推测其产物为羰基化合物。此外,在PVG体系中加入钒钛磁铁矿后,经相似的光化学反应,同样产生V挥发性物质。发现光化学治理污染技术带来环境二次污染的可能性。A photochemical vapor generation system of vanadium(V)based on transition metal ion enhancement was developed in this study.In formic acid(FA)medium,the addition of Cu^(2+),Co^(2+)and Fe3+can largely facilitate the photochemical reduction of V.Among them,Cu^(2+)was found the most effective“sensitizers”.The signal response of V was enhanced about 10 times in the presence of 20 mg/L Cu^(2+).The main parameters affecting the photochemical reduction of V,including the type and concentration of sensitizers,the wavelength and time of UV irradiationthe,the type and concentration of low molecular weight organic acids,the gas-liquid interface,the carrier gas flow rate,and the effects of coexisting ions,were evaluated in detail.Under the selected condition of 20%(v/v)FA,20 mgL Cu^(2+)and UV irradiation for 25 s,using inductively coupled plasma mass spectrometer(ICP-MS).The detection limit of V was 3.7μg/L.The precision(RSD)for seven times replicate measurement of 200μg/L of V standard solution was 4.2%.Also,the mechanism of the Cu^(2+)assisted PVG for V was investigated by using UV-vis spectrophotometer(UV-vis)spectrophotometer and gas chromatography-mass spectrometry(GC-MS).The volatile species of V generated during PVG is presumed to be a carbonyl compound.In addition,the generation of volatile species of V was detected after addition of the vanadium-titanium magnetite into the PVG system.The possibility of secondary environmental pollution caused by photochemical pollution control technology was found.

关 键 词：钒 铜离子 光化学蒸气发生 电感耦合等离子体质谱仪 

分 类 号：TB9[一般工业技术—计量学]