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| In situ measurements of available composition and dissociation kinetics of metals in water using DGT |
| Received:February 09, 2017 |
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| KeyWord:diffusive gradients in thin films(DGT);metals;metals complexes;dissociation kinetic constants |
| Author Name | Affiliation | E-mail | | TIAN Na-na | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHAO Yu-jie | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | yujiezhao@126.com | | ZHOU Qi-wen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIU Xiao-wei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YUAN Xu | Guizhou Testing Center of Supervision and Inspection for Quality Safety of Agricultural Products, Guiyang 550004, China | | | SHI Rong-guang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | DAI Li-hong | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | XU Ya-ping | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | |
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| Abstract: |
| The principles of different diffusion layer thickness of diffusive gradients in thin films(DGT) with different dissociation abilities of metal complexes were used to determine the dissociation rate constants and the component composition of metal concentrations. A theoretical model based on this principle was developed to analyze the differences in metal forms and dissociation kinetic constants of Zn, Ni, Cu,Fe, Mn, Cd, and Pb in freshwater. The results showed that the new calculation method overcame the overfitting problem of the original method. Labile concentrations, components, and kinetic constants(K-1) of seven metals in water solution can be calculated in one system without auxiliary morphological analysis software. The contribution of metal complexes to labile concentrations was reflected easily. The theoretical model had a smaller number of parameters, hypothesis and the effects of the metal valence, organic components can be neglected in our system. |
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