Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 337, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129788
Keywords
Mercury detection; SERS; Iron oxide nanoparticle; Plasmon; DMcT; Cosmetics
Funding
- Ministry of Science and Technology, Taiwan [1072112M010003MY3]
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The study demonstrates the use of Surface Enhanced Raman Spectroscopy for the solution phase detection of mercury ions in contaminated cosmetics, showing high detection accuracy.
Heavy metal, such as lead (Pb), arsenic (As), and mercury (Hg), contamination is a grave global issue that has affected public health via drinking water, paints, and a wide range of personal consumer products such as cosmetics. Here, we have used Surface enhanced Raman spectroscopy (SERS) for the novel solution phase detection of Hg2+ ions in spiked cosmetic (skin whitening) samples by using 2,5-Dimercapto-1,3,4-thiadiazole (DMcT) functionalized silver shelled iron oxide (Fe3O4@Ag-DMcT) nanoparticles (NPs). Fe3O4@Ag NPs (12 ? 4 nm) are the magneto-plasmonic SERS enhancers, and DMcT work as the Hg2+ reporter. We have optimized 2 mg/mL of Fe3O4@Ag:DMcT with 10-4 M of DMcT to be the best for SERS based Hg2+ detection in spiked samples of commercial skin whitening product. The samples mixed with the SERS probe were sealed in a capillary tube and placed on a magnet under the Raman spectroscope. A calibration curve of the variation of the 1360 cm- 1 band of DMcT as a function of Hg2+ concentration was first determined using a cream, and a liquid phase randomly chosen cosmetics. Unknown samples spiked with low (10-8 M), and high (10-4 M) concentrations of Hg2+ could be successfully detected with - 35 %, and 14.6 % error in measured intensities, respectively, with respect to the calibrated data. We estimate a limit of detection (LoD) for Hg2+ in real cosmetic sample as 1 nM (-0.2 ppb).
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