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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 TEXT SIZE: A A A
A new diffusive gradients in thin films technique (HR-ZCA DGT) was developed for simultaneous twodimensional (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 (R-2 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 C-13), 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 O-2 planar optrode was then tested in sediments to evaluate the dynamics of O-2 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.
 

Publication name

 JOURNAL OF HAZARDOUS MATERIALS Volume: 403 Article Number: 123597 DOI: 10.1016/j.jhazmat.2020.123597 Published: FEB 5 2021

Author(s)

 Ren, Mingyi; Ding, Shiming; Dai, Zhihui; Wang, Jingfu; Li, Cai; Zhong, Zhilin; Cao, Jingxin; Yang, Liyuan; Tsang, Daniel C. W.; Xu, Shiwei; Yang, Chenye; Wang, Yan

Corresponding author(s) 

 DING Shiming 
 smding@niglas.ac.cn
 -Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China.
 DAI Zhihui
 daizhihui@mails.gyig.ac.cn
 -Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China

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