Spectrophotometric chemosensor for determination of sulfide in aqueous solution through ternary complex formation with eosin Y and lead (II)

Document Type : Original Article


Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Islamic Republic of Iran


A chemosensor based on eosin for sensitive and selective determination of S2- in 100% aqueous solution was designed on the basis of the complex formation between eosin and lead. According to the method linear dynamic ranges between 3.831 ×10-6 to 20.15×10-5 molL-1. The calibration sensitivities were also estimated to 2.553 ×10-6, with a detection limit of 1.414 ×10-6 molL-1. No serious interference was evaluated during the analysis of at least 100-fold excess of various anion species such as SO32-,SO42-,S2O32-,S2O82-,SCN-, CN-,PO43- ,HPO42- ,F- ,Cl- ,Br-, I- ,CH3COO- ,CO32-,NO3-. The suggested method was applied for the determination of sulfide in various water samples. Which gave satisfactory results. This method based on the decrease of absorbance at 516 nm which related complex between of eosin-pb with addition S2-.


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