Arsenic solid-phase speciation and reversible binding in long-term contaminated soils

Rahman, M.S.; Clark, Malcolm W.; Yee, Lachlan H; Comarmond, M. Josick; Payne, Timothy E.; Kappen, Peter; Mokhber-Shahin, L.

doi:10.1016/j.chemosphere.2016.11.130

Cited by 27 publications

(9 citation statements)

References 70 publications

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“…However, the median %E of As obtained using a different extracting solution (mainly H 2 PO 4 − ) is about four times higher than the one in this study, probably due to the dissolution of the nonlabile fraction to some extent, as it has been observed for some cationic metals with strong extractant solutions (Hamon, Lombi, Fortunati, Nolan, & Mc Laughlin, 2004;Stroud et al, 2011;Tye et al, 2002). The higher metal lability in mining wastes compared with that in soil samples is in contrast with earlier findings (Degryse et al, 2004;Marzouk et al, 2013b;Rahman et al, 2017) and may be the result of the prolonged weathering time of the collected mining wastes, generating acid drainage after oxidation of the remaining mineral sulfides in the wastes.…”

Section: Total and Labile Metal Concentrationscontrasting

confidence: 91%

The labile fractions of metals and arsenic in mining‐impacted soils are explained by soil properties and metal source characteristics

2020

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Isotopically exchangeable metals in soil, also termed labile metals, are reversibly bound to soil surface and are a better index of the environmental risk of the metals than are their total concentrations. In this study, labile fractions of potentially toxic elements were surveyed in metal mining‐impacted soils of Mexico to test the relative importance of soil properties (pH, effective cation exchange capacity, organic matter, etc.) or attributes of the mines (ore type and lithology, metal mineralogy, etc.) on the fractions of labile elements. Mining waste‐impacted soils, corresponding uncontaminated soils and mining waste were collected around 11 metal mines in Mexico presenting contrasting ore types. Pseudo‐total concentrations and labile fractions of Cd, Ni, Zn, Pb, Cu, and As were determined by aqua regia digestion and isotope dilution, respectively. Pseudo‐total concentrations of these elements ranked: waste > contaminated soil > uncontaminated soils, and Zn and As dominated the concentrations of toxic elements. The labile fractions (% of total) in the soils ranked, with median values in brackets, Pb (22) > Cd (18) > Cu(15) > Ni∼Zn(13) > As(9). The labile fractions of waste samples were slightly higher than those of soil samples suggesting either a high weathering of mining wastes or the stabilization of heavy metals by soil. Stepwise multiple regression showed that soil properties rather than source attributes primarily explained the %E of most elements, except for Zn and As for which the ore lithology was the dominant factor. This study showed that earlier generic models explain metal lability adequately in mining waste‐impacted soils.

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Section: Total and Labile Metal Concentrationscontrasting

confidence: 91%

The labile fractions of metals and arsenic in mining‐impacted soils are explained by soil properties and metal source characteristics

2020

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“…In contrast, low values of m tend to occur for soils with a low ratio of organic C to Al and Fe oxides (Achat et al, 2016). The high K m values of Ferralsols are due to extremely low m values (mean = 0.025, SD = 0.012, n = 26), and are consistent with low ratios of organic C to Al and Fe oxides typically reported in these soils (Randriamanantsoa et al, 2013). The Podzols in the data set, on the other hand, have distinguishably high m values (Mean = 0.50, SD = 0.43, n = 14), consistent with the low Al and Fe oxide content of the upper horizon of Podzols (Achat et al, 2009).…”

Section: Analysis Of Long-term Field Experimentssupporting

confidence: 76%

Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

Helfenstein¹,

Jegminat²,

McLaren³

et al. 2017

Preprint

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Abstract. The exchange rate of inorganic phosphorus (P) between the soil solution and solid phase, also known as soil solution P turnover, is essential for describing the kinetics of bioavailable P. While soil solution P turnover (Km) can be determined by tracing radioisotopes in a soil-solution system, few studies have done so. We believe that this is due to a lack of understanding on how to derive Km from isotopic exchange kinetic (IEK) experiments, a widespread form of radioisotope dilution study. Here, we provide a derivation of calculating Km using parameters obtained from IEK experiments. We then calculated Km for 217 soils from published IEK experiments in terrestrial ecosystems, and also for that of 18 long-term P fertilizer field experiments. Analysis of the global compilation dataset revealed a negative relationship between concentrations of soil solution P and Km. Furthermore, Km buffered isotopically exchangeable P in soils with low concentrations of soil solution P. This finding was supported by an analysis of long-term P fertilizer field experiments, which revealed a negative relationship between Km and phosphate buffering capacity. Our study thus highlights the potential of Km for future studies &#8211; not only for P, but also for other environmentally-relevant, strongly-sorbing elements with radioisotopes such as zinc, cadmium, nickel, arsenic, or uranium.

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“…In contrast, low values of m tend to occur for soils with a low ratio of organic C to Al and Fe oxides . The high K m values of Ferralsols are due to extremely low m values (mean = 0.025, SD = 0.012, n = 26), and are consistent with low ratios of organic C to Al and Fe oxides typically reported in these soils (Randriamanantsoa et al, 2013). The Podzols in the data set, on the other hand, have distinguishably high m values (Mean = 0.50, SD = 0.43, n = 14), consistent with the low Al and Fe oxide content of the upper horizon of Podzols (Achat et al, 2009).…”

Section: Analysis Of Long-term Field Experimentssupporting

confidence: 58%

“…Extrapolated E (t) values are highly influenced by concentrations of P w . One of the main challenges of the IEK experiment is the accurate and precise determination of P w , particularly in high P-fixing soils (Randriamanantsoa et al, 2013). Analysis involving E (t) could only be performed for studies that reported P inorg in addition to P w , m, and n. To examine the relationship between K m and isotopically exchangeable P, E (t) was calculated for t = 0 to 129 600 min (equal to 3 months) using Eq.…”

Section: Discussionmentioning

confidence: 99%

“…The isotope exchange kinetic approach has also been successfully applied to study availability of Zn (Sinaj et al, 1999), Cd (Gray et al, 2004;Gérard et al, 2000), Ni (Echevarria et al, 1998), As (Rahman et al, 2017), and U (Clark et al, 2011), and applications are also plausible for other elements with radioisotopes. Isotope exchange kinetic studies with Zn, Cd, and Ni have used the same method as studies on P analyzed here, also modeling the decline in radioactivity using Eq.…”

Section: Implications For Using K Mmentioning

confidence: 99%

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Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

et al. 2018

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Abstract. The exchange rate of inorganic phosphorus (P) between the soil solution and solid phase, also known as soil solution P turnover, is essential for describing the kinetics of bioavailable P. While soil solution P turnover (K m ) can be determined by tracing radioisotopes in a soil-solution system, few studies have done so. We believe that this is due to a lack of understanding on how to derive K m from isotopic exchange kinetic (IEK) experiments, a common form of radioisotope dilution study. Here, we provide a derivation of calculating K m using parameters obtained from IEK experiments. We then calculated K m for 217 soils from published IEK experiments in terrestrial ecosystems, and also that of 18 long-term P fertilizer field experiments. Analysis of the global compilation data set revealed a negative relationship between concentrations of soil solution P and K m . Furthermore, K m buffered isotopically exchangeable P in soils with low concentrations of soil solution P. This finding was supported by an analysis of long-term P fertilizer field experiments, which revealed a negative relationship between K m and phosphate-buffering capacity. Our study highlights the importance of calculating K m for understanding the kinetics of P between the soil solid and solution phases where it is bioavailable. We argue that our derivation can also be used to calculate soil solution turnover of other environmentally relevant and strongly sorbing elements that can be traced with radioisotopes, such as zinc, cadmium, nickel, arsenic, and uranium.

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Arsenic solid-phase speciation and reversible binding in long-term contaminated soils

Cited by 27 publications

References 70 publications

The labile fractions of metals and arsenic in mining‐impacted soils are explained by soil properties and metal source characteristics

The labile fractions of metals and arsenic in mining‐impacted soils are explained by soil properties and metal source characteristics

Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

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