发光钨氧簇材料对水中重金属铬离子的荧光检测特性分析

本文利用Eu3+离子嵌入钨氧簇材料（化合物1）优异的发光特性，将其作为荧光探针材料，系统研究了其对水中重金属Cr3+离子的荧光检测性能。利用稳态瞬态荧光光谱仪对化合物1对水中Cr3+离子荧光检测的选择性、抗干扰能力、检出限等指标进行表征与分析。结果表明，化合物1的猝灭常数K_q为1.41×108 L·mol?1·s?1，远低于最大散射碰撞猝灭常数2.00×1010 L·mol?1·s?1，显示出化合物1对重金属Cr3+离子的快速灵敏的荧光猝灭响应。化合物1在同时含有不同阴、阳离子的待测液中的荧光检测结果显示其对水溶液中Cr3+离子的荧光检测具有较强的抗干扰能力。经计算获得化合物1对水溶液中Cr3+离子的检出限LOD为4.21×10?7 mol/L，显示出化合物1对水环境中的Cr3+离子具有很好的检出效果。本研究为水中重金属Cr3+离子的荧光检测提供一种灵敏、可靠的新方法。

Fluorescence Detection Characteristic of Heavy-metal Chromium Ions in Water by Photoluminescent Tungsten-oxide Cluster Material

In this work, using Eu3+ embedded tungsten-oxygen cluster (compound 1) as the fluorescent probe material, the rapid and sensitive fluorescence detection of heavy metal Cr3+ ions in aqueous solution by compound 1 has been systematically studied. The selectivity, anti-interference ability and detection limit of compound 1 for fluorescence detection of Cr3+ ions in water were characterized and analyzed by steady-state transient fluorescence spectrometer. The results showed that compound 1 exhibited a rapid and sensitive fluorescence quenching response to heavy metal Cr3+ ions with strong anti-interference ability. The calculated value of quenching constant (1.41×108 L·mol?1·s?1) was far lower than the maximum scattering collision quenching constant (2.00×1010 L·mol?1·s?1), which showed that compound 1 exhibited a rapid and sensitive fluorescence quenching response to heavy metal Cr3+ ions. Fluorescence detection results of compound 1 in the aqueous solution containing different cations and anions showed that compound 1 had strong anti-interference ability for fluorescence detection of Cr3+ ions in aqueous solution. The calculated results indicated that detection limit of compound 1 for Cr3+ ions in aqueous solution was 4.21×10?7 mol/L, which showed that compound 1 had a good detection effect on Cr3+ ions in water environment. This study was supposed to provide a sensitive and reliable method for the fluorescence detection of heavy metal Cr3+ ions in water.