Development of onsite multi analysis system for ions in aquatic samples based on novel fluoroionophores

荧光光谱技术在水生环境污染物的现场实时监测中具有很大的潜力；然而，其在环境水生样品中的应用却极为有限。在本研究中，开发了一种基于bodipy -三联吡啶缀合物的新型氟离子载体，并将其应用于城市径流中Zn浓度的测定。在水中，氟离子团选择性地与Zn2+结合。荧光强度比值法可以定量测定Zn浓度，检出限为9 ug/L，对环境水样来说是足够低的。为了证明该方法对环境样本的适用性，我们用复杂矩阵测量了城市径流样本中的锌浓度。荧光光谱法可测定样品中Zn的总含量和溶解含量，电感耦合等离子体-原子发射光谱法测定样品中Zn的相对误差小于30%。

Fluorescence spectroscopy has great potential for on-site and real-time monitoring of pollutants in aquatic environments; however, its application to environmental aquatic samples has been extremely limited. In this study, a novel fluoroionophore based on a BODIPY-terpyridine conjugate was developed and applied to determine Zn concentrations in urban runoff. The fluoroionophore selectively bound to Zn2+ in water. Zn concentrations could be quantified using the ratio of fluorescence intensities, and the detection limit was 9 ug/L, which is sufficiently low for environmental aquatic samples. To demonstrate applicability of the method to environmental samples, we measured Zn concentrations in urban runoff samples with a complex matrix. The total and dissolved fractions of Zn in the samples could be determined by fluorescence spectroscopy and its relative error was estimated to be less than 30% by inductively coupled plasma-atomic emission spectroscopy analysis.