- Title
- The effects of exogenous organic matter addition on bioaccessibility, adsorption kinetics and fractionation of antimony in soils
- Creator
- Bagherifam, Saeed; Brown, Trevor C.; Naidu, Ravi; van Hullebusch, Eric D.
- Relation
- Water, Air, and Soil Pollution Vol. 234, Issue 9, no. 580
- Publisher Link
- http://dx.doi.org/10.1007/s11270-023-06607-y
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2023
- Description
- 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.
- Subject
- antimony; bioavailability; organic matter; bioaccessibility; adsorption kinetics
- Identifier
- http://hdl.handle.net/1959.13/1488832
- Identifier
- uon:52545
- Identifier
- ISSN:0049-6979
- Language
- eng
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