The effects of exogenous organic matter addition on bioaccessibility, adsorption kinetics and fractionation of antimony in soils

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2023-08-23 DOI:10.1007/s11270-023-06607-y

Saeed Bagherifam, Trevor C. Brown, Ravi Naidu, Eric D. van Hullebusch

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Abstract

Organic matter (OM) plays a pivotal role in adsorptive behavior, speciation, and bioavailability of nutrients and metal(loids) in soils. However, the effects of OM on adsorption, fractionation, and bioavailability of antimony (Sb) in soils is largely unknown. In this study, the effects of two types of exogenous OM, including humic acid (HA) and fulvic acid (FA), on Sb bioavailability were compared in soils spiked with 1000 mg Sb kg^-1 and incubated for 3 months under constant conditions. Treated soils were then subjected to single and sequential extractions using a Simplified Bioaccessibility Extraction Test (SBET) and BCR fractionation method as well as kinetic and desorption tests. Furthermore, SEM-EDX elemental maps of antimony were studies to better understand the distribution of antimony and its associations with soil elements. The kinetic data for amended and unamended soils fitted well with the pseudo-second order model, demonstrating that chemisorption might be the rate determining step. Bioaccessibility of antimony increased up to 65% in HA soils and OM additions increased acid-soluble fraction of Sb by approximately 40% (HA) and 75% (FA), compared to the control soils. OM amendments remarkably increased desorption of Sb from soils, whereas the maximum uptake capacity of Sb reduced in OM treated soils. The residual fraction accounted for 92% of total Sb in experimental soils, which was shifted to more labile fractions after OM amendments. The results of this research revealed that OM addition can greatly affect the bioaccessibility, distribution pattern and adsorption of Sb in Sb-impacted soils.

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外源有机质添加对土壤中锑的生物可达性、吸附动力学和分馏的影响

有机质(OM)在土壤中对养分和金属(液态)的吸附行为、形态形成和生物有效性起着关键作用。然而，OM对锑(Sb)在土壤中的吸附、分馏和生物有效性的影响在很大程度上是未知的。本研究比较了腐植酸(HA)和黄腐酸(FA)两种外源有机酸对Sb生物利用度的影响，并在Sb kg-1添加1000 mg Sb kg-1的土壤中恒温培养3个月。然后使用简化生物可及性提取试验(SBET)和BCR分馏法以及动力学和解吸试验对处理后的土壤进行单次和顺序提取。此外，还研究了锑的SEM-EDX元素图，以更好地了解锑的分布及其与土壤元素的关系。修正和未修正土壤的动力学数据符合拟二阶模型，表明化学吸附可能是速率决定步骤。与对照土壤相比，HA土壤中锑的生物可达性提高了65%，OM的添加使Sb的酸溶性分别提高了约40% (HA)和75% (FA)。OM的添加显著增加了土壤对Sb的解吸，而OM处理的土壤对Sb的最大吸收能力则降低了。实验土壤中Sb的残余组分占总Sb的92%，经OM修正后Sb的残余组分转变为更不稳定的组分。结果表明，添加OM可显著影响Sb在受Sb影响土壤中的生物可达性、分布格局和吸附。图形抽象

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.