一种简单的可比色识别焦磷酸根的化学传感体系

摘要

A ternary complex formed by pyrocatechol,copper ions and phenanthroline violet was used to construct a simple chemosensing ensemble.The ensemble showed high selective recognition to pyrophosphate (PPi),with a noticeable color change from green to yellow.UV-Vis Titration data of PPi indicated that the ab-sorbance at 698 nm was proportional to PPi concentration in the range of 9~54 μmol·L-1 (R=0.9902),whilst the detection limit was 2.15 μmol · L-1 .The anion competitive experiments revealed that the ensemble dis-played a better anti-interference ability,but other anions such as F- ,Cl- ,Br- ,I- ,AcO- ,CO2 -3 ,C2 O2 -4 ,SO2 -4 , HSO-4 ,PO3 -4 ,H 2 PO-4 ,HPO2 -4 did not affect PPi recognition process.%邻苯二酚紫、铜离子与邻二氮菲能形成一种三元络合物,构成一种简单的化学传感体系。该体系能够选择性识别水溶液中的焦磷酸根(PPi),PPi 的加入会引起溶液颜色由绿到黄的变化。PPi 的紫外滴定实验表明,698 nm 处的吸光度与 PPi 浓度在9~54μmol·L-1范围内具有良好的线性关系(R=0.9902),检出限为2.15μmol·L-1。阴离子竞争实验表明,该识别过程具有较强的抗干扰性,其它阴离子(F-、Cl-、Br-、I-、AcO-、CO2-3、C2 O2-4、SO2-4、HSO-4、PO3-4、H 2 PO-4、HPO2-4)的过量存在基本不影响 PPi 的识别。