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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

文献类型： 外文期刊

作者： Ren, Mingyi 1 ; Ding, Shiming 1 ; Dai, Zhihui 4 ; Wang, Jingfu 5 ; Li, Cai 6 ; Zhong, Zhilin 1 ; Cao, Jingxin 1 ; Yang, L 1 ;

作者机构： 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Nanjing EasySensor Environm Technol Co Ltd, Nanjing 210018, Peoples R China

4.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China

5.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

6.Jinan Univ, Sch Resources & Environm, Jinan 250022, Peoples R China

7.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China

8.Jiangsu Acad Agr Sci, Cent Lab, Nanjing 210008, Peoples R China

关键词： Oxyanion; Potentially toxic elements; Sulfide; Diffusive gradients in thin films; Planar optrode

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2021 年 403 卷

页码：

收录情况： SCI

摘要： 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.

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