Facilitated transport of ferrihydrite with phosphate under saturated flow conditions

IF 3.5 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Tufail Shah , Kang Zhao , Ai Chen , Atif Muhmood , Syed Atizaz Ali Shah , Muhammad Kashif Irshad , Yuji Arai , Jianying Shang
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Abstract

With increasing phosphate (P) entering the environment during agricultural application, the subsurface flow of particular P has been recently discussed as a vital P transport pathway. Iron (oxyhydr)oxide colloid-facilitated P transport is critical for iron and P biogeochemical processes in the subsurface. This study investigated the ferrihydrite colloid-facilitated P transport through adsorption and column experiments under different P concentrations and three pH conditions. Increased P loading on ferrihydrite colloids decreased the transport of ferrihydrite colloids (< 8.0%) under acid conditions through pore straining and irreversible attachment. Under neutral and alkaline conditions, ferrihydrite colloids exhibited more negative surfaces and smaller diameters with increasing P, which further enhanced ferrihydrite colloid transport (maximum to 95.6%). Ferrihydrite colloid-facilitated P transport was limited under acid conditions, and it was 10% - 57% enhancement under neutral and alkaline conditions with increasing P adsorption. Under neutral conditions, ferrihydrite colloid-facilitated P transport was strongest (maximum to 68.84%) because of its stronger ferrihydrite colloid transport than under acid conditions and larger P adsorption capacity than under alkaline conditions. Our findings indicate that the facilitated transport of ferrihydrite colloids in the presence of P may be appreciable in iron and phosphate-rich soil and subsurface systems, which is essential for evaluating the fate of iron and iron-facilitated P and potential environmental risks of P transport in the subsurface.

Abstract Image

饱和流动条件下铁水物与磷酸盐的促进迁移
随着农业施肥过程中进入环境中的磷酸盐(P)越来越多,地表下特定 P 的流动最近被讨论为一种重要的 P 运输途径。铁(氧氢)氧化物胶体促进的磷迁移对地下的铁和磷生物地球化学过程至关重要。本研究在不同的 P 浓度和三种 pH 值条件下,通过吸附和柱实验研究了铁氧体胶体促进 P 的迁移。在酸性条件下,铁水泥土胶体(< 8.0%)通过孔隙应变和不可逆附着,增加铁水泥土胶体上的 P 负载,降低了铁水泥土胶体(< 8.0%)的传输能力。在中性和碱性条件下,随着 P 值的增加,无水铁胶体表现出更多的负表面和更小的直径,这进一步提高了无水铁胶体的迁移率(最高达 95.6%)。在酸性条件下,铁酸盐胶体促进的钾迁移受到限制,而在中性和碱性条件下,随着钾吸附量的增加,铁酸盐胶体的钾迁移增强了 10%-57%。在中性条件下,由于铁水泥土胶体比酸性条件下的铁水泥土胶体迁移能力更强,且比碱性条件下的铁水泥土胶体对 P 的吸附能力更大,因此铁水泥土胶体对 P 的迁移促进作用最强(最大可达 68.84%)。我们的研究结果表明,在富含铁和磷酸盐的土壤和地下系统中,铁酸盐胶体在P存在下的促进迁移作用可能是显著的,这对于评估铁和铁促进的P的归宿以及P在地下迁移的潜在环境风险至关重要。
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来源期刊
Journal of contaminant hydrology
Journal of contaminant hydrology 环境科学-地球科学综合
CiteScore
6.80
自引率
2.80%
发文量
129
审稿时长
68 days
期刊介绍: The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.
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