%0 Journal Article %T Introduction of a new nitrite-selective optical sensor for food analysis using a copper(II) schiff base complex %J Eurasian Chemical Communications %I Sami Publishing Company (SPC) %Z 2717-0535 %A Habibzadeh, Sepideh %A Tavallail, Hossein %A Esmaielzadeh, Sheida %A Gharghani, Zahra %D 2020 %\ 02/01/2020 %V 2 %N 2 %P 247-256 %! Introduction of a new nitrite-selective optical sensor for food analysis using a copper(II) schiff base complex %K Optical sensor %K copper(II) Schiff base %K nitrite %K Spectrophotometry %K formation constant %R 10.33945/SAMI/ECC.2020.2.10 %X 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. %U https://www.echemcom.com/article_92416_96fb7c1c0f4cf54fed80c9a61fd2964e.pdf