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| Characterization of arsenic(V)adsorption-desorption in the soils from Kuitun cropland, Xinjiang |
| Received:January 21, 2022 |
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| KeyWord:arsenic(Ⅴ);cropland soil;adsorption-desorption;SEM-EDS;FTIR |
| Author Name | Affiliation | E-mail | | DENG Wenwen | College of Resource and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | LUO Yanli | College of Resource and Environment, Xinjiang Agricultural University, Urumqi 830052, China | luoyanlimail@sina.com | | LIU Chang | College of Resource and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | LIU Chentong | College of Resource and Environment, Xinjiang Agricultural University, Urumqi 830052, China | |
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| Abstract: |
| This study aimed to investigate the characteristics of As(Ⅴ)adsorption and desorption in the cropland soils collected from Kuitun reclamation area in Xinjiang. In this study, the adsorption-desorption capacities and the binding mechanism of As(Ⅴ)in the soil were investigated by means of adsorption-desorption test, combined with scanning electron microscopy(SEM), X-ray spectroscopy(EDS), and Fourier infrared spectroscopy(FTIR). The results showed that the single-layer and multi-layer adsorption occurred in the process of As(Ⅴ)adsorption, and the adsorption was easy to be carried out(Freundlich parameter n>2). The adsorption capacity, binding capacity, and adsorption rate of soil for As(Ⅴ)were the maximum at 35℃, minimum at 15℃, and the desorption capacity of soil for As(Ⅴ) showed minimum and maximum at 35℃ and 15℃, respectively, where the quantities were measured at 15, 25℃, and 35℃. FTIR results showed that soil was a complex of many kinds of Si, Fe, and Al oxides, and the adsorption-desorption reaction mainly took place on OH, N H, C O, C H, and SH functional groups. Clay minerals and organic matter were carriers for As(Ⅴ)to provide complexation and promote the adsorption of As(Ⅴ). SEM-EDS results showed that As(Ⅴ)was adsorbed onto organic matter, various metal oxides/hydroxides and clay minerals containing C, Si, K, Ca, Na, Mg, Al, and Fe. The soil environment with high pH and low organic matter in the study area facilitated easy release of As(Ⅴ)into the soil solution, and increased the risk of As(Ⅴ)migration to deep soil and plants. |
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