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A new DGT technique comprising a hybrid sensor for the simultaneous high resolution 2-D imaging of sulfides, metallic cations, oxyanions and dissolved oxygen.

Authors
  • Ren, Mingyi1
  • Ding, Shiming2
  • Dai, Zhihui3
  • Wang, Jingfu4
  • Li, Cai5
  • Zhong, Zhilin1
  • Cao, Jingxin1
  • Yang, Liyuan5
  • Tsang, Daniel C W6
  • Xu, Shiwei7
  • Yang, Chenye7
  • Wang, Yan8
  • 1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China. , (China)
  • 2 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China. Electronic address: [email protected] , (China)
  • 3 State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. Electronic address: [email protected] , (China)
  • 4 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. , (China)
  • 5 School of Resources and Environment, University of Jinan, Jinan 250022, China. , (China)
  • 6 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong China. , (China)
  • 7 Central Laboratory, Jiangsu Academy of Agricultural Science, Nanjing 210008, China. , (China)
  • 8 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China. , (China)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
Aug 02, 2020
Volume
403
Pages
123597–123597
Identifiers
DOI: 10.1016/j.jhazmat.2020.123597
PMID: 32781278
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

A new diffusive gradients in thin films technique (HR-ZCA DGT) was developed for simultaneous two-dimensional (2-D) chemical imaging of sulfides, metallic cations and oxyanions (S, Cd, Co, Fe, Cu, Mn, Ni, Pb, Zn, As, Cr, Mo, Sb, Se, V, P and W) at the submillimeter scale, combined with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis. A novel binding gel was prepared using a double precipitation method with AgI and zirconium oxide (Zr-oxide) deposited sequentially on a preformed Chelex-100 resin gel. A good linear relationship was observed (R2>0.99) between mass accumulation of the 17 assessed elements on the binding gel and the corresponding standardized laser ablation signals (signals of elements divided by signals of internal standard 13C), proving the feasibility of LA-ICP-MS analysis. Good analytical precision (RSD<12 %) was achieved for all 17 elements. A hybrid sensor comprising the novel DGT binding gel overlying an O2 planar optrode was then tested in sediments to evaluate the dynamics of O2 and multiple elements. Results showed that the mobility of As, P and W were controlled by precipitation/dissolution processes with Fe/Mn oxides. V, Co, Ni, Zn, Mo, Cd and Sb were released at the sediment surface with the oxidation of iron sulfides. Copyright © 2020 Elsevier B.V. All rights reserved.

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