Abstract
A new simple and inexpensive optical chemical sensor for mercury(II) ion in aqueous solutions is presented. The mercury sensing membrane was prepared by incorporating of triazene ((E)-1-(2-ethoxyphenyl)-3-(4-nitrophenyl) triaze-1-ene) (L) as a suitable ligand for Hg(II) on triacetylcellulose membrane. Spectrophotometric study of complex formation between the triazene ligand L and Hg2+ in dimethyl formamide solution indicated a large stability constant for the mercury ion complex. The membrane responds to mercury ion by changing color reversibly from orange to green in buffer solution at pH 3.0. A linear relationship was observed between the membrane absorbance at 405 nm in a range from 7 to 90 µg mL-1 with a limit of detection of 64 ng mL-1 in aqueous solutions at pH 3.0. The optical sensor was successfully applied to the determination of mercury in spiked water samples.
Highlights
Mercury is one of the most toxic elements in the world and represents a major toxicity to microorganisms and environment even in low concentrations.[1]
A New Triazene Ligand Immobilized on Triacetylcellulose Membrane
A new triazene ligand (E)-1-(2-ethoxyphenyl)-3-(4-nitrophenyl)triaze-1ene (L) is immobilized on a triacetylcellulose membrane to be used as an effective ligand for construction of a selective optical sensor for the spectrophotometric determination of Hg2+ in aqueous solutions
Summary
Mercury is one of the most toxic elements in the world and represents a major toxicity to microorganisms and environment even in low concentrations.[1].
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