Adsorption and desorption of arsenic and its immobilization in soils

Almeida, Cecília Calhau; Fontes, Maurício Paulo Ferreira; Dias, Adriana Cristina; Pereira, Thiago Torres Costa; Ker, João Carlos

doi:10.1590/1678-992x-2018-0368

Cited by 9 publications

(6 citation statements)

References 38 publications

(66 reference statements)

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“…Such discrepant contents as those obtained in the present study (26.59 -0.56 mg kg -1 ) may indicate the need for standardizing more than one quality reference value (QRV), thus reducing the possibility of classifying natural contents as contamination or allowing soils with very low contents to be contaminated. VRQs can be split into groups with different clay and/or iron oxide contents, since this study (Table 6), as well as several others (Campos et al, 2013, De Menezes et al, 2020, Almeida et al, 2020, found positive correlation between arsenic content and those said attributes. Source: Author's own production, 2020.…”

Section: Resultsmentioning

confidence: 57%

Arsenic in Santa Catarina soils

Machado¹,

Miquelluti²,

Campos³

2021

Rev. ambiente água

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Arsenic (As) is one of the most harmful chemical elements known to man and to the environment, mainly due its high toxicity and wide distribution; the content of this element within the soils is a genuine concern, thus making it paramount to know its natural contents in a regional context. The present study aimed to determine the natural Arsenic content in the A horizon of 31 soil profiles from the state of Santa Catarina, Brazil, which is useful in determining reference values, monitoring, remediation of contaminated areas, legal regulation and Brazilian laws. Soil samples were prepared following the USPEA 3051A SW-846 method and were previously chemically reduced from As(V) to AS(III) by using the BCR method. The determination was performed in an Inductively Coupled Plasma - Optical Emission Spectrometry - Hydride Generation (ICP-OES-HG at cold vapor). Results obtained from the soil groups reveal the materials of basaltic origins as the ones with more As content while those of sediment origins had lesser content. Evaluated soil profiles fit into the following descending order regarding their As content: Latossolos, according to EMBRAPA (Oxisols according to Soil Taxonomy) > Nitossolo (Ultisols, Oxisols (Kandic), Alfisols) > Chernossolos (---) = Cambissolo (Inceptisols) = Argissolo (Ultisols) > Neossolos (Entisols). Keywords: arsenic content, reference value, soils, trace element.

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Section: Resultsmentioning

confidence: 57%

Arsenic in Santa Catarina soils

Machado¹,

Miquelluti²,

Campos³

2021

Rev. ambiente água

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“…The As concentration of AT increased continuously from 1.044 mg/L (natural pH 8.36) with added KOH and reached 4.476 mg/L at pH 13 due to the dissolution of arsenopyrite (Equation (8)) and the deprotonation in alkaline solution because of the amphoteric property of As [ 35 ]. With decreasing pH, the As concentration of AT decreased to the lowest value at pH 5.5 (0.626 mg/L) and then increased to the highest value at pH 2 (25.491 mg/L), which was attributed to the adsorption of iron and aluminum oxides/hydroxides on As in different valence states and the dissolution of the oxides/hydroxides as the pH went down [ 36 ]. The As equilibrium concentration of T-3 and PST was between one and two orders of magnitude lower than that of AT over a pH range of 2–13 due to the reaction of hydration products of SSB and OPC with As in AT; the As concentration of T-3-90d was 0.0276 mg/L at natural pH 12.16, while that of PST-90d was 0.004 mg/L at natural pH 12.56.…”

Section: Resultsmentioning

confidence: 99%

Solidification/Stabilization of Arsenic-Containing Tailings by Steel Slag-Based Binders with High Efficiency and Low Carbon Footprint

Zhang

et al. 2021

Materials

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The disposal of nonferrous metal tailings poses a global economic and environmental problem. After employing a clinker-free steel slag-based binder (SSB) for the solidification/stabilization (S/S) of arsenic-containing tailings (AT), the effectiveness, leaching risk, and leaching mechanism of the SSB S/S treated AT (SST) were investigated via the Chinese leaching tests HJ/T299-2007 and HJ557-2010 and the leaching tests series of the multi-process Leaching Environmental Assessment Framework (LEAF). The test results were compared with those of ordinary Portland cement S/S treated AT (PST) and showed that the arsenic (As) curing rates for SST and PST samples were in the range of 96.80–98.89% and 99.52–99.2%, respectively, whereby the leached-As concentration was strongly dependent on the pH of the leachate. The LEAF test results showed that the liquid–solid partitioning limit of As leaching from AT, SST, and PST was controlled by solubility, and the highest concentrations of leached As were 7.56, 0.34, and 0.33 mg/L, respectively. The As leaching mechanism of monolithic SST was controlled by diffusion, and the mean observed diffusion coefficient of 9.35×10-15 cm2/s was higher than that of PST (1.55 × 10−16 cm2/s). The findings of this study could facilitate the utilization of SSB in S/S processes, replacing cement to reduce CO2 emissions.

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“…The set of physical, chemical and mineralogical characteristics gives the soil a specific capacity to retain anionic species. The Inceptisols, due to their lower Fe and Al content, especially gibbsite, were the soil class with the lowest adsorption of anionic species (Almeida et al, 2021).…”

Section: Soil Chemical Characteristicsmentioning

confidence: 96%

“…Due to the soil diversity in Brazil, soil characterization is essential to better agricultural or environmental usage and subsequent management. Mineralogical studies are very important to understanding the physical and chemical properties of the soil (Camargo et al, 2008;Almeida et al, 2021). Phosphorous adsorption is mainly attributed to gibbsite, goethite and hematite, the predominant minerals in highly weathered soils (Fontes and Weed, 1996;Schaefer et al, 2008;Fontes, 2012).…”

Section: Introductionmentioning

confidence: 99%

Mineralogical, chemical and electrochemical attributes of soils

Almeida

Fontes

Dias

et al. 2021

Sci. agric. (Piracicaba, Braz.)

Self Cite

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A set of attributes endows the soils with distinctive characteristics and astute understanding is required in order to formulate suitable strategies for soil management. The aim of this study was to physically, chemically and mineralogically characterize samples of the main soil classes in Minas Gerais, Brazil, determine the point of zero salt effect (PZSE) and the point of zero charge (PZC), and ascertain the correlation between these factors and soil attributes. The soils evaluated presented different textural classes ranging from loamy sand (Entisol) to very clayey (some Oxisols and Ultisols). The soils differed substantially in terms of fertility, presenting a range from dystrophic (low fertility, base saturation < 50 %) to eutrophic character (fertility, base saturation ≥ 50 %), even within the same soil class, such as the Oxisols, which suggests the concurrence of the parent material. Highly weathered soils are predominant in Minas Gerais and these soils are composed predominantly of kaolinite, gibbsite, goethite and hematite. Traces of hydroxy-Al interlayered vermiculite and illite were also found in the Oxisols, Ultisols and Inceptisols. A correlation between the PZSE and the PZC in the A horizon was observed. A high degree of correlation was observed between the PZC and the exchangeable aluminum and the ratio of iron obtained by ammonium oxalate and dithionite-citrate (Fe o /Fe d) in both the A and B horizons of soil classes. The results obtained reinforce the importance of knowledge of soil attributes to the adoption of practices such as the management of phosphate fertilization in clayey soils and liming in soils rich in aluminum.

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Adsorption and desorption of arsenic and its immobilization in soils

Cited by 9 publications

References 38 publications

Arsenic in Santa Catarina soils

Arsenic in Santa Catarina soils

Solidification/Stabilization of Arsenic-Containing Tailings by Steel Slag-Based Binders with High Efficiency and Low Carbon Footprint

Mineralogical, chemical and electrochemical attributes of soils

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