48a17b2d6144e6ae502d2ecceced83a1 chemosensors_a2022v10n4p148.pdf 5c65fc40de6b8c218806fcb495edffecef808145 chemosensors_a2022v10n4p148.pdf d5428e5bbc230f1d359a0ca986ce12703e14c49578c0c06a784ec57f7bae7837 chemosensors_a2022v10n4p148.pdf Title: Composite Electrodes Based on Carbon Materials Decorated with Hg Nanoparticles for the Simultaneous Detection of Cd(II), Pb(II) and Cu(II) Subject: Monitoring water quality has become a goal to prevent issues related to human health and environmental conditions. In this sense, the concentration of metal ions in water sources is screened, as these are considered persistent contaminants. In this work, we describe the implementation of customized graphite electrodes decorated with two types of Hg nanoparticles (Hg-NPs), optimized toward the electrochemical detection of Cd, Pb and Cu. Here, we combine Hg, a well-known property to form alloys with other metals, with the nanoscale features of Hg-NPs, resulting in improved electrochemical sensors towards these analytes with a substantial reduction in the used Hg amount. Hg-NPs were synthesized using poly(diallyldimethylammonium) chloride (PDDA) in a combined role as a reducing and stabilizing agent, and then appropriately characterized by means of Transmission Electron Microscopy (TEM) and Zeta Potential. The surface of composite electrodes with optimized graphite content was modified by the drop-casting of the prepared Hg-NPs. The obtained nanocomposite electrodes were morphologically characterized by Scanning Electron Microscopy (SEM), and electrochemically by Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The results show that the Hg-NP-modified electrodes present better responses towards Cd(II), Pb(II) and Cu(II) detection in comparison with the bare graphite electrode. Analytical performance of sensors was evaluated by square-wave anodic stripping voltammetry (SWASV), obtaining a linear range of 0.005–0.5 mgL-1 for Cd2+, of 0.028–0.37 mgL-1 for Pb2+ and of 0.057–1.1 mgL-1 for Cu2+. Real samples were analyzed using SWASV, showing good agreement with the recovery values of inductively coupled plasma–mass spectrometry (ICP-MS) measurements. Keywords: Hg nanoparticles; electrode surface modification; nanocomposite graphite electrode; square-wave anodic stripping voltammetry; cyclic voltammetry; simultaneous metal detection; environmental analysis Author: Laia L. Fernández, Julio Bastos-Arrieta, Cristina Palet and Mireia Baeza Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Mon Apr 18 02:28:34 2022 CEST ModDate: Mon Apr 18 02:35:29 2022 CEST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 15 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 3320570 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- AIQCCL+VnURWPalladioL-Bold Type 1 Custom yes yes no 10 0 KORLVE+VnURWPalladioL Type 1 Custom yes yes no 15 0 KTWETG+URWPalladioL-Bold Type 1 Custom yes yes no 19 0 DSYJSE+URWPalladioL-Roma Type 1 Custom yes yes no 24 0 DASCAD+URWPalladioL-Ital Type 1 Custom yes yes no 28 0 XVRPCI+CMSY10 Type 1 Builtin yes yes no 32 0 MCBCCI+SourceSansRoman-Regular Type 1C Custom yes yes no 40 0 MCBCCM+SourceSansRoman.613wght Type 1C Custom yes yes no 44 0 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Identity-H yes yes yes 274 0 MDKAKE+PalatinoLinotype TrueType WinAnsi yes yes no 280 0 MDKALG+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 283 0 MDKAKB+PalatinoLinotype,Bold CID TrueType Identity-H yes yes yes 298 0 MDKAKC+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 304 0 MDKAKD+PalatinoLinotype CID TrueType Identity-H yes yes yes 307 0 MDKAKE+PalatinoLinotype TrueType WinAnsi yes yes no 313 0 MDKALG+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 316 0 RIPPOK+VnURWPalladioL-Italic Type 1 Custom yes yes no 326 0 Jhove (Rel. 1.22.1, 2019-04-17) Date: 2023-04-18 02:27:23 CEST RepresentationInformation: chemosensors_a2022v10n4p148.pdf ReportingModule: PDF-hul, Rel. 1.12.1 (2019-04-17) LastModified: 2022-04-21 10:48:28 CEST Size: 3320570 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 479 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@44c8afef Item: Title: Materials and Methods Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7b69c6ba Children: Item: Title: Chemical Reagents and Materials Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@46daef40 Item: Title: Apparatus Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@12f41634 Item: Title: Synthesis Hg-NPs Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@13c27452 Item: Title: Electrode Fabrication Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@262b2c86 Item: Title: Drop-Casting Modification of Electrodes Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@371a67ec Item: Title: Morphological and Chemical Characterization Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@5ed828d Item: Title: Electrochemical Characterization Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@50d0686 Item: Title: Electroanalytical Measurements Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7a3d45bd Item: Title: Results Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1e7c7811 Children: Item: Title: Morphological and Chemical Characterization of Hg-NPs Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77ec78b9 Item: Title: Electrochemical Characterization of Hg-NP-Modified Composite Electrodes Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1a3869f4 Item: Title: Analytical Characterization: Cation Metal Detection Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@a38d7a3 Item: Title: Interference Study Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77f99a05 Item: Title: Suitability for Real Samples Analysis Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@63440df3 Item: Title: Discussion Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@3aeaafa6 Item: Title: Conclusions Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@76a3e297 Item: Title: References Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@4d3167f4 Info: Title: Composite Electrodes Based on Carbon Materials Decorated with Hg Nanoparticles for the Simultaneous Detection of Cd(II), Pb(II) and Cu(II) Author: Laia L. Fernández, Julio Bastos-Arrieta, Cristina Palet and Mireia Baeza Subject: Monitoring water quality has become a goal to prevent issues related to human health and environmental conditions. In this sense, the concentration of metal ions in water sources is screened, as these are considered persistent contaminants. In this work, we describe the implementation of customized graphite electrodes decorated with two types of Hg nanoparticles (Hg-NPs), optimized toward the electrochemical detection of Cd, Pb and Cu. Here, we combine Hg, a well-known property to form alloys with other metals, with the nanoscale features of Hg-NPs, resulting in improved electrochemical sensors towards these analytes with a substantial reduction in the used Hg amount. Hg-NPs were synthesized using poly(diallyldimethylammonium) chloride (PDDA) in a combined role as a reducing and stabilizing agent, and then appropriately characterized by means of Transmission Electron Microscopy (TEM) and Zeta Potential. The surface of composite electrodes with optimized graphite content was modified by the drop-casting of the prepared Hg-NPs. The obtained nanocomposite electrodes were morphologically characterized by Scanning Electron Microscopy (SEM), and electrochemically by Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The results show that the Hg-NP-modified electrodes present better responses towards Cd(II), Pb(II) and Cu(II) detection in comparison with the bare graphite electrode. Analytical performance of sensors was evaluated by square-wave anodic stripping voltammetry (SWASV), obtaining a linear range of 0.005 0.5 mgL-1 for Cd2+, of 0.028 0.37 mgL-1 for Pb2+ and of 0.057 1.1 mgL-1 for Cu2+. Real samples were analyzed using SWASV, showing good agreement with the recovery values of inductively coupled plasma mass spectrometry (ICP-MS) measurements. 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