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

Abstract

, and Ni 2+ ) 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 Hg 2+ . The limits of detection and quantification were found to be 0.9 g L −1 and 2.7 g L −1 , respectively, and relative standard deviations varied in the range 9-12% for Hg content from 0.9 to 12.5 g L −1 and 5-9% for Hg levels from 25 to 500 g L −1 . The method was validated by analysis of CRM Estuarine Water BCR505. A possible mechanism of interaction between AgNPs and Hg 2+ for both concentration ranges was proposed on the basis of UV-Vis, TEM, and SAED analyses.

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

“…Other systems based on different functionalizations of silver nanoparticles for Hg (II) ion detection have been developed in the last years. To cite only some of them: 2-aminopyrimidine-4,6-diol [115], bifunctionalized with citrate and L-cysteine [79], starch-coated NPs in presence of HNO 3 [125], gelatin funcionalized [126] and leaf extract of Dahlia pinnata [71].…”

Gum acacia-based silver nanoparticles as a highly selective and sensitive dual nanosensor for Hg(ii) and fluorescence turn-off sensor for S2− and malachite green detection

“…8 Fluorescence spectroscopy and colorimetric method have surpassed the above-mentioned methods owing to their high sensitivity and selectivity, fast analysis, and less complicated experimental procedures. 9,10 Noble metal nanoparticles such as gold and silver have aroused a great deal of recognition because of the optical phenomenon called 'Surface Plasmon Resonance' exhibited by them. [11][12][13] Silver nanoparticle (AgNP)-based optical sensors are considered to be more efficient and sensitive compared to gold nanoparticle-based sensors because of the higher visible region molar extinction coefficient of silver nanoparticles (more than 100 fold).…”

Original photochemical synthesis of Ag nanoparticles mediated by potato starch

“…In addition, it is necessary to understand the mechanisms of these synthetic routes to increase their efficiency. Several routes have been developed with the aim of using natural materials such as starch to coat, protect and stabilize AgNPs [3][4][5].…”

“…It can be seen that the starch has been effectively used as a stabilizing agent in several AgNPs syntheses, as well as a potential reducing agent [3,4,[26][27][28][29][30][31]. Furthermore, the reduction of Ag + ions can be photochemically-assisted by UV radiation.…”