Electrochemical Detection of Trace Arsenic(III) by Nanocomposite of Nanorod-Like α-MnO2Decorated with ∼5 nm Au Nanoparticles: Considering the Change of Arsenic Speciation
- 22 September 2016
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 88 (19), 9720-9728
- https://doi.org/10.1021/acs.analchem.6b02629
Abstract
It has been reported that the majority of groundwater shows weak alkaline in which the As(III) species would be present as neutral H3AsO3 species and ionized H2AsO3– species. However, as most reported previously, electrochemical detection of As(III) has been operated under acidic conditions and the nonionic As(III) (H3AsO3) is the dominant species. Therefore, considering the change of As(III) speciation in different pH conditions, to develop a reliable method for the detection of As(III) in alkaline media might be more meaningful for practical applications. Here, combined the multilayer adsorption of nanorod-like α-MnO2 with the excellent electrocatalytic ability of ∼5 nm Au nanoparticles (AuNPs), an efficient and ultrahigh anti-interference electrochemical detection of As(III) with AuNPs/α-MnO2 nanocomposite in alkaline media (nearly real water environment) was developed. Notably, we have provided a thorough electrochemical analytical investigation to confirm the advantage of As(III) detection in alkaline media. The system was evaluated by a series of interference tests, and no obvious interference from commonly coexisting substances (referring to the groundwater, Togtoh region, Inner Mongolia, China) was observed in alkaline media. Furthermore, electrodes robust stability and excellent reproducibility were obtained. Under the optimized conditions, the limit of detection (3σ method) toward As(III) was 0.019 ppb, and the obtained sensitivity was 16.268 ± 0.242 μA ppb–1 cm–2. Finally, the proposed method has been successfully employed for detection of As(III) in a real water sample.Keywords
Funding Information
- National Natural Science Foundation of China (21277146, 21377131, 21475133, 61474122, 61573334, U1532123)
This publication has 62 references indexed in Scilit:
- Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OESFood Analytical Methods, 2013
- An Arsenic Forecast for ChinaScience, 2013
- Different Crystallographic One-dimensional MnO2 Nanomaterials and Their Superior Performance in Catalytic Phenol DegradationEnvironmental Science & Technology, 2013
- Electrochemical Detection of Arsenic(III) Completely Free from Noble Metal: Fe3O4 Microspheres-Room Temperature Ionic Liquid Composite Showing Better Performance than GoldAnalytical Chemistry, 2013
- Novel 3D Hierarchical Cotton-Candy-Like CuO: Surfactant-Free Solvothermal Synthesis and Application in As(III) RemovalACS Applied Materials & Interfaces, 2012
- Adsorption of Lead(II) on O2-Plasma-Oxidized Multiwalled Carbon Nanotubes: Thermodynamics, Kinetics, and DesorptionACS Applied Materials & Interfaces, 2011
- Sensitive electrochemical detection of arsenic (III) using gold nanoparticle modified carbon nanotubes via anodic stripping voltammetryAnalytica Chimica Acta, 2008
- Controlled Preparation of MnO2 Hierarchical Hollow Nanostructures and Their Application in Water TreatmentAdvanced Materials, 2008
- Residential exposure to drinking water arsenic in Inner Mongolia, ChinaToxicology and Applied Pharmacology, 2007
- Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrodeAnalytica Chimica Acta, 2007