Selective determination of mercury (II) in coastal water using bio- functionalized gold nanoparticles

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Deshpande Kanchanmala; Thekkedath Anju

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Journal Paper

Paper Information

Journal: Journal of Water and Environmental Nanotechnology Year:621 | Volume: | Issue: Page(s): 370-379

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Information Journal Paper

Title

Selective determination of mercury (II) in coastal water using bio- functionalized gold nanoparticles

Author(s)

Deshpande Kanchanmala | Thekkedath Anju | Issue Writer Certificate

Keywords

Coastal waterQ4

Mercury ionsQ4

colorimetric sensingQ4

Matrix effectQ4

Surface Plasmon ResonanceQ4

lysine capped nanoparticleQ4

Abstract

The key to simple and rapid detection of a large volume of samples lies in the hands of solution-based nanomaterial sensors. Quantification of mercury in the river and Coastal water is analytically challenging due to the potential interference of the matrix. In this endeavor, lysine-capped gold nanoparticles (Lys-AuNPs) based colorimetric sensors are demonstrated here towards efficient detection of trace amounts of Mercury ions (Hg2+) in coastal and estuarine water. The colorimetric behavior of Lys-AuNPs is related to Surface Plasmon Resonance (SPR)During analysis, interestingly a decrease in the intensity of the original SPR peak at 530 nm was observed, with the concomitant appearance of a new peak at a longer wavelength due to agglomerated Lys- AuNPs. Developed sensors exhibit excellent performance in different environmental samples with high selectivity towards Hg2+ ions in the presence of other metal ions. For the analysis of Coastal water samples, a low value of regression coefficient was observed due to the potential interference of salt in the sample. To overcome this, matrix-matching experiments were carried out. Developed Lys- AuNPs show good selectivity towards Hg2+ in matrixed matched diluted Coastal water samples. With a sensitivity of 0.02 ppm, the sensor can be utilized to screen large numbers of Coastal water samples for their Hg2+ content to satisfy coastal regulation norms. As a whole, this method is simple, sensitive, selective, cost-effective and can be used to screen large numbers of samples across the coastal area for monitoring Hg2+ concentration.

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