Adusumalli Venkata N K B, Runowski Marcin, Lis Stefan
Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
ACS Omega. 2020 Feb 28;5(9):4568-4575. doi: 10.1021/acsomega.9b03956. eCollection 2020 Mar 10.
We report a facile and effective luminescence method for the determination of the WO ion in aqueous medium at initial pH = 6.3. This is achieved using 3,5-dihydroxybenzoic acid-capped CaF:Tb (5%) nanocrystals (NCs) as a luminescent probe. This is accomplished based on the energy transfer luminescence from the WO ion to the Tb ion in small-size CaF:Tb NCs. Hydroxyl groups on the surface ligand helps in binding the tungstate ion to the surface of the NCs. With the gradual addition of the WO ion, the intensity of the Tb excitation and emission spectra significantly increased. The linear range of the detection was from 1 to 10 μM for the WO ion ( = 0.99). The calculated detection limit was 0.4 μM (by applying the 3σ/K criterion).
我们报道了一种简便有效的发光方法，用于在初始pH = 6.3的水性介质中测定WO离子。这是通过使用3,5-二羟基苯甲酸包覆的CaF:Tb（5%）纳米晶体（NCs）作为发光探针来实现的。这是基于WO离子向小尺寸CaF:Tb NCs中Tb离子的能量转移发光来完成的。表面配体上的羟基有助于将钨酸根离子结合到NCs的表面。随着WO离子的逐渐加入，Tb激发和发射光谱的强度显著增加。WO离子的检测线性范围为1至10 μM（ = 0.99）。计算出的检测限为0.4 μM（通过应用3σ/K标准）。
