Evaluation of different methods for assessing bioavailability of DDT residues during soil remediation

Wang, Jie; Taylor, Allison R.; Xu, Chenye; Schlenk, Daniel; Gan, Jay

doi:10.1016/j.envpol.2018.02.082

Cited by 31 publications

(30 citation statements)

References 84 publications

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“…The analysis of tissue samples followed a method described in previous studies, 21,22 and the details are given in the Supporting Information. The BSAF, i.e., the ratio of the concentration in the worm (normalized over lipid content) to the concentration in soil or sediment (normalized over organic carbon content), was calculated as the bioavailability end point for native (BSAF) and labeled (BSAF*) POPs:…”

Section: ■ Introductionmentioning

confidence: 99%

A Direct Method for Quantifying the Effects of Aging on the Bioavailability of Legacy Contaminants in Soil and Sediment

Wang

Schlenk

Gan

2019

Environ. Sci. Technol. Lett.

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A majority of persistent organic pollutants (POPs) that we see today have in fact undergone extensive aging in the environment, as their use was discontinued several decades ago. While contaminant aging is commonly believed to lead to reduced bioavailability, at present there is not a direct method for quantitatively determining the effect of aging. Here we propose a method based on the addition of isotope-labeled reference compounds to field-collected soil or sediment and comparison of the bioavailability between aged POPs and their freshly added isotope-labeled counterparts. We demonstrated this method using bioaccumulation by invertebrates and 24 h Tenax desorption as bioavailability end points. Compared to the freshly added isotope-labeled references, biota-to-soil/sediment accumulation factors (BSAFs) of native (aged) DDTs (p,p′-DDD, p,p′-DDE, and p,p′-DDT) and PCBs (PCB52 and PCB70) were consistently smaller, indicating that aging decreased their bioaccumulation potential. For two aged soil samples from Florida, BSAFs for earthworm (Eisenia fetida) decreased by 29.3–62.8% for DDT derivatives and 18.3–34.4% for the PCBs. In aged marine and lake sediments from California, BSAFs for indicator invertebrates (Nereis virens and Lumbriculus variegatus) decreased by 19.4–67.5% for DDTs and 12.0–46.9% for the two PCBs. Similar reductions were also observed when the same samples were analyzed using 24 h Tenax desorption. Given that mass spectrometry is widely available, a simple method based on the addition of isotope-labeled analogues may be easily adopted and will be of great value for quantifying aging effects to refine risk estimates of contaminated soil and sediment sites, including the need for remediation intervention.

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Section: ■ Introductionmentioning

confidence: 99%

A Direct Method for Quantifying the Effects of Aging on the Bioavailability of Legacy Contaminants in Soil and Sediment

Wang

Schlenk

Gan

2019

Environ. Sci. Technol. Lett.

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“…It is still used in some countries to control malaria vectors (2,4). However, notwithstanding the general prohibition in use, its residues are still consistently found in soil, food, human, and animal samples (5)(6)(7)(8)(9). DDT is classified as a persistent organic pollutant (POP) because of its high stability in the environment, which makes it a lasting source of ecosystem contamination (10)(11)(12).…”

mentioning

confidence: 99%

Bioremediation of Dichlorodiphenyltrichloroethane (DDT)-Contaminated Agricultural Soils: Potential of Two Autochthonous Saprotrophic Fungal Strains

Russo

Ceci

Pinzari

et al. 2019

Appl Environ Microbiol

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DDT (dichlorodiphenyltrichloroethane) was used worldwide as an organochlorine insecticide to control agricultural pests and vectors of several insect-borne human diseases. It was banned in most industrialized countries; however, due to its persistence in the environment, DDT residues remain in environmental compartments, becoming long-term sources of exposure. To identify and select fungal species suitable for bioremediation of DDT-contaminated sites, soil samples were collected from DDT-contaminated agricultural soils in Poland, and 38 fungal taxa among 18 genera were isolated. Two of them, Trichoderma hamatum FBL 587 and Rhizopus arrhizus FBL 578, were tested for tolerance in the presence of 1-mg liter−1 DDT concentration by using two indices based on fungal growth rate and biomass production (the tolerance indices Rt:Rc and TI), showing a clear tolerance to DDT. The two selected strains were studied to evaluate catabolic versatility on 95 carbon sources with or without DDT by using the Phenotype MicroArray system and to investigate the induced oxidative stress responses. The two strains were able to use most of the substrates provided, resulting in both high metabolic versatility and ecological functionality in the use of carbon sources, despite the presence of DDT. The activation of specific metabolic responses with species-dependent antioxidant enzymes to cope with the induced chemical stress has been hypothesized, since the presence of DDT promoted a higher formation of reactive oxygen species in fungal cells than the controls. The tested fungi represent attractive potential candidates for bioremediation of DDT-contaminated soil and are worthy of further investigations. IMPORTANCE The spread and environmental accumulation of DDT over the years represent not only a threat to human health and ecological security but also a major challenge because of the complex chemical processes and technologies required for remediation. Saprotrophic fungi, isolated from contaminated sites, hold promise for their bioremediation potential toward toxic organic compounds, since they might provide an environment-friendly solution to contamination. Once we verified the high tolerance of autochthonous fungal strains to high concentrations of DDT, we showed how fungi from different phyla demonstrate a high metabolic versatility in the presence of DDT. The isolates showed the singular ability to keep their functionality, despite the DDT-induced production of reactive oxygen species.

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“…MPs affect the biophysical properties (damages soil structure, reduces aeration and water permeability and water holding capacity) of soil 17,127,128 because of the decreasing absorption capacity of freely available chemicals in soil-water due to hydrophobicity of MPs 129 . Figure 5 shows an overview of atmospheric deposition of MPs in the terrestrial ecosystem and their effects on soil properties and feedbacks to the atmosphere 130 .…”

Section: Terrestrial Ecosystemmentioning

confidence: 99%

Microplastics in ecosystems: their implications and mitigation pathways

Roy

Mohanty

Misra

2022

Environ. Sci.: Adv.

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Evaluation of different methods for assessing bioavailability of DDT residues during soil remediation

Cited by 31 publications

References 84 publications

A Direct Method for Quantifying the Effects of Aging on the Bioavailability of Legacy Contaminants in Soil and Sediment

A Direct Method for Quantifying the Effects of Aging on the Bioavailability of Legacy Contaminants in Soil and Sediment

Bioremediation of Dichlorodiphenyltrichloroethane (DDT)-Contaminated Agricultural Soils: Potential of Two Autochthonous Saprotrophic Fungal Strains

Microplastics in ecosystems: their implications and mitigation pathways

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