Journal
MICROCHIMICA ACTA
Volume 188, Issue 11, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-021-05032-4
Keywords
Mercury detection; Colorimetric detection; Smartphone-based detection; On-site monitoring system; Nanozyme-based colorimetric detection; Gold nanozyme; Hydrogel block
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Funding
- Korea Basic Science Institute [C180310, C140110]
- National Research Council of Science and Technology-Korea Basic Science Institute Postdoctoral Research Fellowship for Young Scientists at Korea Basic Science Institute in South Korea
- National Research Council of Science & Technology (NST), Republic of Korea [C180310, C140110] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A sensitive on-site mercury sensing platform was developed for simple and effective monitoring of mercury levels in the field. The platform integrates a nanozyme-based mercury detection system with a colorimetric device, allowing for real-time and efficient monitoring of mercury levels with high accuracy and applicability, making it suitable for a wide range of field measurements.
A sensitive on-site mercury sensing platform was developed for simple and effective monitoring of mercury levels in the field. The simple and practical mercury detection system was designed by integrating an Au nanoparticle-PEG hydrogel block nanozyme (Au-HBNz) into a polymer film-based colorimetric device. Upon addition of Hg2+ ions, Au-HBNz exhibited excellent peroxidase-like activity, catalyzing the oxidation of 3,3',5,5'-tetramethylbenzidine into a blue-colored product, which has a maximum absorbance at 652 nm. The resulting color intensity change was evaluated using a smartphone for simple and rapid Hg2+ detection with a broad detection range (0.008-20 mu g.mL(-1)) and a linear concentration-response relationship (R-2 = 0.96). The detection limit (1.10 ng.mL(-1)) was lower than the maximum permissible Hg2+ levels in drinking water set by the World Health Organization (6 ng.mL(-1)) and U.S. Environmental Protection Agency (2 ng.mL(-1)). The recoveries of Hg2+ determination in river water by spiking Hg2+ samples ranged from 92 to 106%, which indicated high validity and applicability of the Hg2+ detection system for field measurements. Thus, the developed sensor enables highly selective and efficient real-time monitoring of Hg2+.
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