Web of Science (Emerging Sources Citation Index)

Document Type : Original Research Article

Authors

1 Department of Chemistry, Payame Noor University, PO BOX 19395-4697 Tehran, Iran

2 Department of Chemistry, Darab Branch, Islamic Azad University, 7481783143-196 Darab, Iran

3 Department of Chemistry, Payame Noor University, P.O. BOX 19395-4697 Tehran, Iran

Abstract

A copper(II) Schiff base complex, [Cu(cd4OMeSalMeen)], methyl-2-{[1-methyl-2-(4-methoxy-phenolate)mehylidynenitrilo]ethyl}amino-1-cyclopentene dithiocarboxylate copper(II), was incorporated into triacetylcellulose membrane and applied as ionophore in order to develop an anion-selective optical sensor for the analysis of nitrite by absorption spectrophotometry. At optimum pH 3.0, a linear calibration curve was observed for nitrite in the range of 0.50 to 7.00 mgL-1 with a detection limit of 0.04 mgL-1. The response time of the optode (t95%) was found to be 8–10 min, depending on the nitrite ion concentration. The proposed sensor was fully recovered in nitric acid solution (0.1 M) and had acceptable reproducibility (RSD=1.9%). The optode exhibited good selectivity toward nitrite ion according to hard-soft acid base (HSAB) principle and the formation constant was calculated. The application of the sensor for determination of nitrite content in meat products was quiet successful.

Graphical Abstract

Introduction of a new nitrite-selective optical sensor for food analysis using a copper(II) schiff base complex

Keywords

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