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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38479

Title: Detection of Arsenic(III) through Pulsed Laser-Induced Desorption/Ionization of Gold Nanoparticles on Cellulose Membranes
Authors: Cheng-I Weng;Jin-Shun Cang;Jia-Yaw Chang;Tung-Ming Hsiung;Binesh Unnikrishnan;Yu-Lun Hung;Yu-Ting Tseng;Yu-Jia Li;Yu-Wei Shen;Chih-Ching Huang
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Date: 2014
Issue Date: 2016-09-07T06:25:43Z
Publisher: Analytical Chemistry
Abstract: Abstract: We have developed an assay based on gold nanoparticle-modified mixed cellulose ester membrane (Au NPs-MCEM) coupled with laser-induced desorption/ionization mass spectrometry (LDI-MS)-for the detection of arsenic(III) ions (arsenite, AsO2–) in aqueous solution. When the Au NPs reacted with lead ions (Pb2+) in alkaline solution (5 mM glycine–NaOH, pH 12), Au–Pb complexes, PbO, and Pb(OH) were formed immediately on the Au NP surfaces. The Pb species reacted rapidly with subsequently added AsO2– to form PbOAs2O3, (PbO)2As2O3, and/or (PbO)3As2O3 shells (2–5 nm) on the Au NPs’ surfaces. As a result, significant observable aggregation of the Au NPs occurred in the solution. This Pb2+/Au NP probe allowed the detection of AsO2– at concentrations as low as 0.6 μM with high selectivity (at least 100-fold over other anions and metal ions). To further improve the sensitivity, we prepared Au NPs-MCEM for the LDI-MS-based detection of AsO2– ions. The intensity of the signal for the [Pb]+ ions in the mass spectra increased when the Au NPs-MCEM reacted with AsO2–; in contrast, the intensity of the signal for [Au]+ ions decreased. Accordingly, the [Pb]+/[Au]+ peak ratio increased upon increasing the AsO2– concentration over the range from 10 nM to 10 μM. The limit of detection at a signal-to-noise ratio of 3 was 2.5 nM, far below the action level of As (133 nM, ca. 10 ppb) permitted by the US EPA for drinking water. Relative to other nanoparticle-based arsenic sensors, this approach is rapid, specific, and sensitive; in addition, it can be applied to the detection of AsO2– in natural water samples (in this case, streamwater, lake water, tap water, groundwater, and mineral water).
Relation: 86(6)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38479
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