Colorimetric Detection of Hg(II) Ion Using Silver Nanoparticles Capped with 3-Hydroxybenzoic Acid

Gusrizal Gusrizal,Ajuk Sapar,Sri Juari Santosa,Andi Hairil Alimuddin,Rizki Noviani Ridwan

doi:10.20884/1.jm.2019.14.1.460

Abstract

In this paper, we report for the first time thesimple method for detection of Hg(II) ion in anaqueousmedium using silver nanoparticles capped with 3-hydroxybenzoic acid. Silver nanoparticles capped with 3-hydroxybenzoic acid were preparedby reduction of the silver ion with 3-hydroxybenzoic acid and without surface functionalization. The formation of silver nanoparticles was characterized by a UV-Visible spectrophotometer. The yellowcolloid of prepared silver nanoparticles capped with 3-hydroxybenzoic acid showed a surface plasmon resonance peak at 420 nm. The ability of silver nanoparticles capped with 3-hydroxybenzoic acid in detection was tested by doing a reaction with several metal ions individually(Na(I), K(I), Cu(II), Zn(II), Ca(II), Mg(II), Hg(II), Mn(II), Ni(II), Pb(II), and Co(II)). It was foundthat silver nanoparticles capped with 3-hydroxybenzoic acid highly selective toHg(II) and then the prepared silver nanoparticles were developedfor detection of Hg(II) ion. Addition of 1 mL Hg(II) ion into 4mL the as-preparedsilver nanoparticles reducedthe peak of surface plasmon resonance spectra, andthe reduction of peak intensity was proportional to the concentration of Hg(II) ion. A goodlinear relationship (R2= 0.998) between absorbance at 420 nm and concentrationof Hg(II) over the range 1.0x10-3to 5.5x10-3M was obtained. Silver nanoparticles capped with 3-hydroxybenzoic acid were highly sensitive to Hg (II) ion with the detection limit down to 4.7x10-5M. Application the method to the real water sample showed the excellentresult with recovery ranged from 98 to 101%. The proposed method was found to be useful forthe colorimetric detection of Hg(II) ion in an aqueousmedium.

Highlights

Nanoparticles are generally defined as particles with one or more dimension at the nanoscale which size range typically between 1 to 100 nm
Synthesis of Silver Nanoparticles Silver nanoparticles capped with 3-hydroxybenzoic acid were prepared by reduction of 2.0x10-4 M silver nitrate with 2.0x10-3 M 3-hydroxybenzoic acid
Several published data show that the position of maximum peak varies with the reducing and capping agent used in the synthesis of silver nanoparticles

Summary

Introduction

Nanoparticles are generally defined as particles with one or more dimension at the nanoscale which size range typically between 1 to 100 nm. Dissolution of nanoparticles results from oxidation of silver nanoparticles with an analyte which reduces the intensity of surface plasmon resonance band is used as the mechanism in the detection of the analyte (Annadhasan, Muthukumarasamyvel, Babu, & Rajendiran, 2014).

Results

Conclusion