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| LDHs-DGT based in-situ extraction and detection of labile Cr in environment |
| Received:April 09, 2023 |
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| KeyWord:chromium;labile;detection technology;diffusive gradients in thin-films(DGT);dynamic monitoring |
| Author Name | Affiliation | E-mail | | TIAN Peining | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Zhen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Runqi | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Chuangchuang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHOU Qiwen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | caezhouqiwen@126.com | | ZHAO Yujie | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | zhaoyujie@caas.cn |
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| Abstract: |
| To monitor the in-situ morphological changes of Cr in soil, a device for diffusive gradient in thin-films(LDHs-DGT)with nano Mg/Al double hydroxides(Mg/Al-LDHs)as the binding film was developed in this study. The in-situ extraction and determination of active Cr content and Cr(Ⅲ)and Cr(Ⅵ)in the environment were realized using ICP-MS and an ultra-trace hexavalent chromium analyzer. Experimental results showed that the LDHs binding membrane in the device had a fast adsorption rate for Cr(Ⅲ)and Cr(Ⅵ), and the maximum adsorption capacities were 181.27 μg · cm-2 and 176.29 μg · cm-2, respectively. The device could accurately extract Cr(Ⅲ)and Cr(Ⅵ)in an environment at a pH of 5~8 and an ionic strength of less than 50 mmol · L-1. It could effectively avoid the influence of interfering ions on the device. The blank background value was 4.9 ng, and the detection limit was 0.22 ng·mL-1. The diffusion coefficients of Cr(Ⅲ)and Cr(Ⅵ)were(3.58±0.02)×10-6 cm2·s-1 and(7.03±0.09)×10-6 cm2·s-1. LDHs-DGT can efficiently detect the temporal and spatial variation of soil active Cr and can dynamically monitor the valence changes of Cr(Ⅲ)and Cr (Ⅵ). |
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