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| Extraction and detection of inorganic arsenic in the environment using nanometer LDHs-DGT |
| Received:March 22, 2023 Revised:May 25, 2023 |
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| KeyWord:layered double hydroxide;thin film diffusive gradient;trivalent arsenic;pentavalent arsenic;dynamic monitoring |
| Author Name | Affiliation | E-mail | | ZHANG Runqi | Agro-Environmental Protection Institute, 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, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | TIAN Peining | Agro-Environmental Protection Institute, 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, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DAI Lihong | Agro-Environmental Protection Institute, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Yujiao | Agro-Environmental Protection Institute, Key Laboratory for Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Yujie | Agro-Environmental Protection Institute, 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: |
| For the effective measurement of arsenic(As)contamination in soil environment, a gradient diffusion thin film device(LDHsDGT)based on nano-layered bimetallic hydroxides(LDHs)as a binding film was developed in this study. The basic performance of the LDHs-DGT device and the applicable conditions were explored. Furthermore, the dynamic changes of soil As(Ⅲ) and As(Ⅴ), and morphological changes of As at different depths under different moisture conditions were explored. The experimental results showed that the novel device was able to measure As over a wide ranges of pH(4-8) and ionic strength(CNaNO3＜0.7 mol·L-1)for the effective extraction and detection of As(Ⅲ) and As(Ⅴ). The adsorption capacities of LDHs-bound membranes were 30 μg·cm-2 and 85 μg·cm-2 for As(Ⅲ) and As(Ⅴ), respectively. The bound membranes achieved total dissociation within 6 h. The LDHs-DGT had good anti-interference properties, and As(Ⅲ) and As(Ⅴ)on the bound membranes. There was no obvious competitive adsorption effect. The results of the actual sample determination reflected the practicality of the DGT device. The findings demonstrate that the LDHs-DGT device enables simple preparation, good detection, and is widely applicable. The device may be valuable for environmental monitoring and assessment. |
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