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

第一作者： Ren, Mingyi

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

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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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