Assessment of Hg2+ in hazardous wastes using chemosensor neutral red dye

Document Type : Original Article

Authors

1 Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt

2 Chemistry Department, Faculty of Science, Helwan University, Cairo, 11795, Egypt

3 Inorganic Chemistry Department, National Research Centre, 33 El-Behouth St., Dokki, Giza, 12622, Egypt

Abstract

A new, simple, sensitive and selective spectrofluorimetric method for the determination of trace amounts of Hg2+ in hazardous wastes of fluorescent lamps using chemosensor neutral red dye is developed in acetonitrile at pH 6.6. The Hg2+ can remarkably quench the fluorescence intensity of neutral red dye in acetonitrile at λex = 380 nm. The lowering of fluorescence intensity of neutral red dye is proportional to the concentration of Hg2+ and it is used as optical sensor for its assessment. The dynamic range found for the determination of Hg2+  concentration is 2.3 × 10-9 – 8.0 ×10-6 mol l−1 with a detection limit of 1.0 ×10−11 mol l−1.        

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