水浴法合成了水溶性YVO_4:Eu荧光纳米粒子,粒子溶液荧光强度大,荧光性能稳定.以YVO_4:Eu粒子作荧光探针,基于Cr(Ⅵ)对YVO_4:Eu粒子的荧光猝灭,建立了简单快速地定量测定痕量Cr(Ⅵ)的新方法.对Cr(Ⅵ)的测定条件及共存离子的干扰进行了考察,在最佳条件下,反应溶液中YVO_4:Eu粒子荧光强度的对数值和Cr(Ⅵ)浓度有良好的线性关系,线性回归方程为1g/L=2.90-1.30×101c(c的单位:10-mol/L),线性相关系数为0.997 1,线性范围为1.04×10~(-4)～5.20×10~(-2)g/L.方法的检出限为1.6×10~(-5)g/L,RSD为1.7%(5.20×10~(-3)g/L,n-11).将方法用于测自来水样中Cr(Ⅵ),回收率为102%～109%.实验探讨了Cr(Ⅵ)对YVO_4:Eu粒子荧光猝灭的机理,结果表明是静态猝灭.
Water-soluble YVO_4:Eu fluorescent nanoparticles were synthesized by water-bath heating method. The fluorescent intensity of nanoparliele solution is high and stable. It was found that the fluorescence of YVO_4:Eu solution could be quenched by chromium(Ⅵ), and thus a simple and quick method to determine trace ehromium(Ⅵ) by using YVO-4 :Eu as fluorescence probe was established. The determination conditions and the interference of coexisting ions were investigated. Under the opti-mized conditions, the logarithm of fluorescent intensity of YVO_4 : Eu nanopartieles in reaction solu-tions is proportional to the concentration of ehromium(Ⅵ) in the range of 1.04 × 10~(-4)-5.20 × 10~(-2) g/L and the linear regression equation is lgI=2.90-1.30 × 10~(-3) c (the unit of c: 10~(-6) mol/L) with the correlation coefficient of 0. 997 1. The detection limit of the method is 1, 6 × 10~(-5) g/L and RSD is 1.7 % for 5.20×10~(-3) g/L ehromium(Ⅵ) (n=11). The method has been applied to determine chromi-um(Ⅵ) in tap water and the recoveries were between 102 % and 109 %. The mechanism of fluorescence quenching by ehrornium (Ⅵ) was also studied, and it was proved that the mechanism is static quench-ing.
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