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| Development and application of chemical speciation models for heavy metals in environmental soil samples |
| Received:May 08, 2018 |
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| KeyWord:chemical speciation;modelling;environmental samples;adsorption |
| Author Name | Affiliation | E-mail | | DENG Ying-xuan | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LI Yong-tao | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Natural Resources & Environment, South China Agricultural University, Guangzhou 510642, China | | | LI Xiao-jing | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Long | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | MA Jie | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | CHEN Ya-li | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WENG Li-ping | Key Laboratory for Environmental Factors Control of Agro-product Quality Safety/Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | wengliping@caas.cn |
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| Abstract: |
| The chemical speciation of heavy metals in soil is closely related to their bioavailability and mobility in the environment. Compared to laboratory analysis, chemical modeling calculation has the advantages of being able to reveal the whole fingerprint of chemical speciation and having the capability to make predictions. In this review, the development of chemical speciation modelling of elements in natural environment is discussed. The characteristics of empirical models and mechanistic models are compared. Advanced surface complexation models for ion adsorption to natural organic matter(using NICA-Donnan model as an example) and to metal oxides(using CD-MUSIC model as an example) are introduced. In addition, the challenges in applying mechanistic modelling to natural environmental samples are summarized. The methods used to obtain input data, i.e. the content of metal oxides, the amount of(active) organic matters and the content of reactive metals are one of the focus of this review. Application of mechanistic models in chemical speciation calculation of heavy metal in soils is illustrated using cadmium(Cd) and arsenic(As) as a representative of cations and oxyanions respectively. In the end, the status of the development and application of mechanistic chemical speciation models for natural environmental samples is concluded, and the problems remaining and future development are visualized. |
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