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While the transformation of antimony(Sb) in paddy soil has been previously investigated, the biogeochemical processes of highly chemical active Sb in the soil remain poorly understood. In addition, there is a lack of quantitative understanding of Sb transformation in soil. Therefore, in this study, the kinetics of exogenous Sb in paddy soils were investigated under anaerobic and aerobic incubation conditions. The dissolved Sb(V) and the Sb(V) extracted by diffusive gradient technique decreased u... 相似文献
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Antimony (Sb) distribution, solubility and mobility onto natural soils of China were studied in lysimeter and batch experiments as a function of physicochemical properties of the soil. An outdoor lysimeter experiment investigated the leaching and migration of Sb in the soils with Sb-polluted topsoil and unpolluted subsoil over a 5 month period. Soil solutions were collected by suction cups installed at different depth of lysimeters, and leachates were regularly collected and analyzed for Sb concentrations. The majority of the added Sb was retained in the topsoil layers, but small portions were moved to the sub-layers. Sb concentrations in the soil solutions and leachates ranged from 0–755.5 (6.38 ± 54 on average) μg l−1 and 0–0.45 (smaller than the detection limit) μg l−1 respectively, indicating the low solubility of Sb in the soils. Batch experiments were performed in order to determine the sorption capacity and the partition coefficient (Kd). Freundlich isotherm described properly the equilibrium experimental data and results show that the Kd values for Primosol, Isohumosol, Ferrosol equal to 22.5, 87.8, 704 L kg−1, respectively. These results showed the strong capacity of the soils to retain Sb, and prevent it being leached down the profile. The mobilizable Sb was in the order: Primosol > Isohumosol > Ferrosol. Sb migration in the soils was mainly associated with the exchangeable, carbonate-bound, and metal–organic complex-bound fractions. Health risk assessment indicates that Sb leaching from Ferrosol will not harm to human health through groundwater under the test conditions, while it has certain health risks from the Isohumosol and Primosol. 相似文献
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The adsorption of Sb(V) ions from aqueous solutions onto commercially available activated alumina (AA) was investigated. AA has a much higher adsorption capacity than presently used adsorbents. Sb(V) ions are likely adsorbed through electrostatic attraction and/or specific adsorption mechanism, while the optimum pH is found in the range of 2.8–4.3. The Sb(V) ions adsorption capacities increase with increasing temperature. The addition of nitrate, acetate, arsenite, chloride, and silicate ions affected Sb(V) ions adsorption only slightly, while the coexisting ascorbate, arsenate, phosphate, sulfate, EDTA, tartrate, and citrate ions substantially depressed Sb(V) ions adsorption. 相似文献
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综述了环境样品中铅、锑、汞、硒形态分析的研究进展,以及光谱法、色谱法、毛细管电泳及其联用技术在形态分析中的应用,展望了环境样品痕量元素形态分析的发展前景。 相似文献
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Ning Wang Jiangtao Feng Wei Yan Luohong Zhang Yonghong Liu Ruihua Mu 《Frontiers of Environmental Science & Engineering》2022,16(8):105
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为掌握“十三五”期间湖南省资江流域锑污染的总体情况和变化趋势,采用数据统计分析方法对2016—2020年该流域水质锑变化特征进行研究,同时分析锑污染时间变化趋势和空间分布情况。结果表明,“十三五”期间,资江流域锑污染整体有较明显改善,尤其资江干流下游益阳市内的锑污染明显减轻,由2016年的超标率100%到2020年全部实现达标,各断面锑的质量浓度最大降幅达55.5%。资江支流中,2020年邵水断面锑质量浓度年均值较2018年下降了13.1%。资江流域的娄底、邵阳和益阳市均采取了一系列锑污染防治措施,使得资江流域锑污染整体有较明显改善。但资江支流中邵水和平溪江污染最重断面锑质量浓度年均值仍有超标,建议“十四五”期间加强流域内涉锑企业和历史遗留污染的治理,力争尽早实现资江全流域水质的全面达标。 相似文献