Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

A sensitive and selective Hg2+ optical sensor has been developed based on the redox interaction of Hg2+ with starch-coated silver nanoparticles (AgNPs) in the presence of 0.005 mol L-1 HNO3. The relative intensity of the localized surface plasmon absorption band of AgNPs at 406nm is linearly dependent on the concentration of Hg2+ with positive slope for the concentration range 0-12.5 mu gL(-1) and negative slope for the concentration range 25-500 mu gL(-1). Experiments performed demonstrated that metal ions (Na+, K+, Mg2+, Ca2+, Pb2+, Cu2+, Zn2+, Cd2+, Fe3+, Co2+, and Ni2+) do not interfere under the same conditions, due to the absence of oxidative activity of these ions, which guarantees the high selectivity of the proposed optical sensor towards Hg2+. The limits of detection and quantification were found to be 0.9 mu gL(-1) and 2.7 mu g(L-1), respectively, and relative standard deviations varied in the range 9-12% for Hg content from 0.9 to 12.5 mu gL(-1) and 5-9% for Hg levels from 25 to 500 mu gL(-1). The method was validated by analysis of CRM EstuarineWater BCR505. A possible mechanism of interaction between AgNPs and Hg2+ for both concentration ranges was proposed on the basis of UV-Vis, TEM, and SAED analyses.