Advances in As contamination and adsorption in soil for effective management. (15th October 2021)

• Record Type: Journal Article
• Authors: Nguyen, Kien Thanh; Ahmed, Mohammad Boshir; Mojiri, Amin; Huang, Yuhan; Zhou, John L.; Li, Donghao
• Is Part Of: Journal of environmental management. Volume 296(2021)
• Publication Date: 2021-10-15
• Subjects: Arsenic -- Soil contamination -- Controlling factors -- Adsorption isotherm -- Soil remediation; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2021.113274
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Arsenic (As) is a heavy metal that causes widespread contamination and toxicity in the soil environment. This article reviewed the levels of As contamination in soils worldwide, and evaluated how soil properties (pH, clay mineral, organic matter, texture) and environmental conditions (ionic strength, anions, bacteria) affected the adsorption of As species on soils. The application of the adsorption isotherm models for estimating the adsorption capacities of As(III) and As(V) on soils was assessed. The results indicated that As concentrations in contaminated soil varying significantly from 1 mg/kg to 116, 000 mg/kg, with the highest concentrations being reported in Mexico with mining being the dominating source. Regarding the controlling factors of As adsorption, soil pH, clay mineral and texture had demonstrated the most significant impacts. Both Langmuir and Freundlich isotherm models can be well fitted with As(III) and As(V) adsorption on soils. The Langmuir adsorption capacity varied in the range of 22–42400 mg/kg for As(V), which is greater than 45–8901 mg/kg for As(III). The research findings have enhanced our knowledge of As contamination in soil and its underlying controls, which are critical for the effective management and remediation of As-contaminated soil. Graphical abstract: Image 1 Highlights: Mining caused the most serious pollution of As in soils. Physisorption is the dominating adsorption mechanism of As(III). Chemisorption is the major adsorption mechanism of As(V). As adsorption is well modelled by the Langmuir and Freundlich isotherms. Soil management should be targeted at key soil properties and As speciation.