The distribution of arsenic fractions and alkaline phosphatase activities in different soil aggregates following four months As(V) ageing

Lu, Guannan; Tian, Hua; Wang, Ziquan; Li, Huayong; Megharaj, Mallavarapu; He, Wenxiang

doi:10.1016/j.chemosphere.2019.124355

Cited by 15 publications

(4 citation statements)

References 29 publications

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“…Once released, As is available for further reaction in anaerobic soil-water systems and reassociates with other soil materials. These resorbed materials and co-precipitates of As in soil initially appear as an early fraction, having loosely bound (Lu et al, 2019;Zhang et al, 2019). In our Eh-pH anaerobic system, dissolved As was near the theoretical transition line of H2AsO4 -, HAsO4 2-, As2O3, and As2S3 in As-S-O-H systems (Brookins, 1988) and trending to become HAsO4 2-(As(V)); however, the speciation of As in soil is far more complex.…”

Section: Discussionmentioning

confidence: 63%

Alteration of Fractionation and Bioavailability of Arsenic (As) in Paddy Soil under Transition from Aerobic to Anaerobic Conditions

Duangthong

Damrongsiri

2021

Environ. Nat. Resour. J.

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The impact of the change from aerobic to anaerobic immersed soil conditions on arsenic (As) fractionation (Tessier’s method) and its bioavailability (ethylene diamine tetraacetic acid extractable) were assessed. As-contaminated paddy soils were tested by laboratory simulation experiments. The samples were aerobic, with 35-49 mg/kg of As at low bioavailability (<2%). Most As was distributed in the stable fraction (77%), followed by As bound to ferric and manganese oxide (17%) and organic compounds (5%), while the mobile fraction (exchangeable and mildly acid-soluble) was limited (1%). After one month under anaerobic simulation, redox potential reduced to less than zero (-32 to -124 mV). The stable fraction of As decreased (-17%), while the mobile fraction increased (+16%) and As bioavailability also increased (+26% total As). Increase in the As mobile fraction was associated with freshly precipitated compounds. The As content in the soil altered from a stable fraction to an available fraction when confined in an anaerobic environment for a long period. Results indicated that agricultural methods which promoted anaerobic conditions in As-contaminated soil should be avoided.

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Section: Discussionmentioning

confidence: 63%

Alteration of Fractionation and Bioavailability of Arsenic (As) in Paddy Soil under Transition from Aerobic to Anaerobic Conditions

Duangthong

Damrongsiri

2021

Environ. Nat. Resour. J.

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“…Water‐soluble Sb is generally highly biotoxic compared with adsorbed Sb (Diquattro et al., 2020). The water‐soluble fraction of heavy metal is not necessarily the main fraction that could inhibit soil enzyme activity (Hu et al., 2014; Lu et al., 2019). However, this study shows that the water‐soluble Sb is the main factor that caused a decrease in DHA in soils compared with the adsorbed Sb fraction.…”

Section: Discussionmentioning

confidence: 99%

“…In some studies, adsorbed heavy metals (As, Se, and Cu) presented significantly higher toxicity to soil enzyme activity than water‐soluble ones. For example, adsorbed As (exchangeable and carbonates As fractions) showed a higher inhibitory effect on alkaline phosphatase (ALP) compared with the water‐soluble As (Lu et al., 2019). Adsorbed Cu and Se (exchangeable Cu and organic matter bound Se) directly affected soil urease and nitrate reductase activities than the water‐soluble fraction (Hu et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Toxicity of antimony in 18 soils of China evaluated by soil dehydrogenase activity

Tian

Liao

et al. 2022

Soil Science Soc of Amer J

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Antimony (Sb) contamination has attracted global attention due to the elevated Sb entering the environment and threatening human health. Dehydrogenase activity (DHA) has been used as a sensitive bioindicator to assess Sb toxicity. However, only total Sb content and a few types of soils were used so far, which ignored the effect of Sb adsorption characteristics and soil heterogeneity in the Sb toxicity assessment. This study used 18 soil samples varying in their properties to explore the Sb adsorption behavior and the subsequent effects on Sb toxicity using DHA as an indicator. The adsorption isotherm parameters of Sb in 18 soils showed that acidic and neutral soils favored Sb adsorption (n a > 2) over alkaline soils (1 < n a < 2), and the adsorption process tended to be irreversible (R L close to 0). The solid binding force (k L ) of Sb to alkaline soils is less than that of acidic and neutral soils; therefore, alkaline soils pose a higher risk of secondary pollution. Variation partitioning analysis showed that water-soluble Sb was the predominant factor responsible for the observed decrease in DHA. Ecological doses (ED 10 ) based on water-soluble Sb fluctuated from 3.4 to 360 mg kg −1 in soils. Soil properties, such as pH, total phosphorus, amorphous Fe, and clay content, played a crucial role in Sb toxicity to DHA. This study highlighted the importance of water-soluble Sb while evaluating the Sb toxicity in soils.Thus, the study is useful in risk assessment and remediation of Sb-contaminated soils.

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“…Many researchers have reported that over time, the binding strength of arsenic introduced into the soil in an easily soluble form increases, and its susceptibility to release from soils decreases. This phenomenon, called ageing, applies not only to arsenic, but also to other contaminants, in particular toxic metals (Tang et al, 2007;Venegas et al, 2016;Lin et al, 2019;Lu et al, 2019). However, the literature does not provide information on the dynamics of the ageing process that takes place in soils with different properties.…”

Section: Introductionmentioning

confidence: 99%

The effects of ageing process on the release of arsenic into soil pore water and related phytotoxicity assessed based on seed germination

Dradrach,

Jędroszka,

Szopka

et al. 2023

Soil Sci. Ann.

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Phytotoxic effects caused by soil contaminants depend both on their total concentrations and also on their forms, in particular those that can be easily released into soil pore water. The contaminants introduced into soil in water soluble forms undergo various transformations referred to as "ageing" which causes reduction of their solubility and toxicity. In this study, we examined the dynamics of such changes under controlled conditions in an incubation experiment. Two relatively light soils, differing in texture (loamy sand and sandy loam), and brought to three various pH ranges, were spiked with water solution of sodium arsenate to obtain different soil concentrations of As, up to 1000 mg•kg -1 . The soils were incubated at constant moisture (80% of water holding capacity) for three months. The changes in water extractability of As over time were examined. The phytotoxicity of As was assessed based on the reduction of germination, using the seeds of two different plant species: white mustard and red fescue. We found that the process of As immobilization in light mineral soils, poor in organic matter, proceeded quickly, and the concentrations of water-soluble As in these soils dropped signifi cantly within one week. The dynamics of those changes depended on soil properties and pH, and As immobilization was most effi cient under acidic conditions. There were no signifi cant differences between the toxicity of As to both plant species examined, as measured in the germination test. The effective concentration of soluble As in soil, resulting in a 50% reduction in the number of germinated seeds, was assessed at about 100 mg•kg -1 . The results provide a reference base for further experiments with spiked soils, and will be used in examination of As binding mechanisms in soils.

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The distribution of arsenic fractions and alkaline phosphatase activities in different soil aggregates following four months As(V) ageing

Cited by 15 publications

References 29 publications

Alteration of Fractionation and Bioavailability of Arsenic (As) in Paddy Soil under Transition from Aerobic to Anaerobic Conditions

Alteration of Fractionation and Bioavailability of Arsenic (As) in Paddy Soil under Transition from Aerobic to Anaerobic Conditions

Toxicity of antimony in 18 soils of China evaluated by soil dehydrogenase activity

The effects of ageing process on the release of arsenic into soil pore water and related phytotoxicity assessed based on seed germination

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