Selective Recognition of Mercury in Waste Water Based on Fluorescence Enhancement Chemosensor
Fluorescence enhancement of N,N-bis(salicylidene)-naphthylene-1,8-diamine (L) has been used to detect trace amounts of mercury ion in ethanol water solution. The fluorescent emission intensity of the probe enhances upon binding to mercury ions. The fluorescence enhancement of L is attributed to a 1:1 complex formation between L and Hg(2+) ion. This phenomenon has been utilized as the basis for selective detection of Hg(2+) ion. The chemosensor can be applied for the quantification of Hg(2+) ion in linear range of 1.6 x 10(-7) to 1.0 x 10(-5) M. The limit of detection was 1.3 x 10(-7) M. The sensor exhibits high selectivity toward Hg(2+) ion in comparison with common metal ions. The proposed fluorescent sensor was successfully used for determination of mercury in water and waste water samples.