| 邓雯文,罗艳丽,刘畅,刘晨通.新疆奎屯农田土壤对砷（Ⅴ）的吸附-解吸特征[J].农业环境科学学报,2022,41(9):1975-1984. |
| 新疆奎屯农田土壤对砷（Ⅴ）的吸附-解吸特征 |
| Characterization of arsenic(V)adsorption-desorption in the soils from Kuitun cropland, Xinjiang |
| 投稿时间：2022-01-21 |
| DOI：10.11654/jaes.2022-0082 |
| 中文关键词: 砷(Ⅴ) 农田土壤 吸附-解吸 扫描电镜-能谱仪 傅里叶红外光谱 |
| 英文关键词: arsenic(Ⅴ) cropland soil adsorption-desorption SEM-EDS FTIR |
| 基金项目:国家自然科学基金项目（42067053，41761097） |
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| 摘要点击次数: 721 |
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| 中文摘要: |
| 为明确新疆奎屯垦区农田土壤对As（Ⅴ）的吸附-解吸特征，本研究通过吸附-解吸试验并结合扫描电子显微镜（SEM）、X射线能谱（EDS）和傅里叶红外光谱（FTIR）技术，探究研究区土壤对As（Ⅴ）的吸附-解吸能力及结合机理。结果表明：研究区土壤在吸附As（Ⅴ）的过程中单层和多层吸附同时发生并以单层吸附为主，且吸附容易进行（Freundlich方程参数n>2）。在15、25℃和35℃ 3个温度下，土壤对As（Ⅴ）的吸附量、结合能力、吸附速率均在35℃时最大，15℃时最小；土壤对As（Ⅴ）的解吸量则在35℃时最小，15℃时最大。土壤是多种Si、Fe、Al氧化物构成的复合体，吸附、解吸反应主要是发生在OH、N H、C O、C H、SH 5种官能团上；黏土矿物和有机质为As（Ⅴ）提供发生络合作用的载体，对As（Ⅴ）的吸附起到了促进作用。As（Ⅴ）被吸附到含有C、Si、K、Ca、Na、Mg、Al和Fe元素的有机质、多种金属（氢）氧化物以及黏土矿物等物质中。研究区高pH、低有机质的土壤环境，使As（Ⅴ）容易被释放到土壤溶液中，从而增大了As（Ⅴ）向深层土壤及植物中迁移的风险。 |
| 英文摘要: |
| 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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