A novel polyvinyl chloride-membrane optical sensor for the determination of Cu2+ ion based on synthesized(N ' E-1,N ' E-2,)-N '(1),N '(2)-bis(pyridine-2-ylmethylene)oxalohydrazide: Experimental design and optimization

摘要

A copper (Cu2+) ion-selective bulk optode was constructed by using (N'E-1,N'E-2)-N'(1),N'(2)-bis(pyridine-2-ylmethylene)oxalohydrazide as ionophore and NaTPB in DBP matrices. Central composite design under response surface methodology was applied for the optimization of variables including pH, amount of ligand, amount of additive and response time which significantly affect the response of proposed sensor. At optimum specified conditions, the high stability, reproducibility and relatively long lifetime of the optical sensor suggest its ability for accurate and precise monitoring of Cu2+ ion content in various real samples over a concentration range of 1.6 x 10(-6) to 3.17 x 10(-5) mol L-1 with a limit of detection of 8.1 x 10(-7) mol L-1 during response time 6.9 min. The proposed optical sensor was successfully applied for the determination of Cu2+ ion in tap water and different samples. (C) 2014 Elsevier B.V. All rights reserved.