Journal
SENSING AND BIO-SENSING RESEARCH
Volume 26, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.sbsr.2019.100303
Keywords
Silver nanoparticles; Carrageenan; Colorimetric sensing; Mercury
Categories
Funding
- Republic of the Philippines, Commission on Higher Education
- De La Salle University through the DLSU-URCO program
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Hydrophilic gelling kit consisting of carrageenan-stabilized silver nanoparticles (AgNPs) is described herein as a selective probe for the colorimetric detection of Hg2+. Spherical AgNPs with surface plasmon resonance (SPR) at 430 nm and TEM size of less than 100 nm were synthesized using kappa-carrageenan to give a dark brown gelling mixture (Carr-AgNP) that were used directly for colorimetric reaction with various metal ions. The reaction is selective only to Hg2+. The dark brown color of the Carr-AgNP was found to fade as the concentration of Hg2+ increases until the mixture turns white. It can detect Hg2+ at a concentration of >= 350 ppm with limits of detection at 2.92x10(-4) M. Quantification of the color change was established using digital photometry with strong correlation observed for L*, R and G color parameters. The role of chlorides in the colorimetric sensing is critical to detecting Hg2+ as excess chlorides promote the formation of AgCl as well as the dissolution of AgNP. The utility of the gelling kit was successfully applied for the detection of mercury(II) in a cosmetic cream sample.
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