Metabolic Responses of Eisenia Fetida to Individual Pb and Cd Contamination in Two Types of Soils

Tang, Ronggui; Ding, Changfeng; Ma, Yibing; Wang, Junsong; Zhang, Taolin; Wang, Xingxiang

doi:10.1038/s41598-017-13503-z

Cited by 17 publications

(1 citation statement)

References 64 publications

(59 reference statements)

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“…To explore the effect of CMC@MMT-FeS on the biotoxicity of Cr(VI)-contaminated soil, Vicia faba and Eisenia foetida were used for biotoxicity testing, using the contaminated soil before and after remediation [ 52 , 53 ].…”

Section: Methodsmentioning

confidence: 99%

Immobilization of Cr(VI) in Soil Using a Montmorillonite-Supported Carboxymethyl Cellulose-Stabilized Iron Sulfide Composite: Effectiveness and Biotoxicity Assessment

Zhang

et al. 2020

IJERPH

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A novel composite of montmorillonite-supported carboxymethyl cellulose-stabilized nanoscale iron sulfide (CMC@MMT-FeS), prepared using the co-precipitation method, was applied to remediate hexavalent chromium (Cr(VI))-contaminated soil. Cr(VI)-removal capacity increased with increasing FeS-particle loading. We tested the efficacy of CMC@MMT-FeS at three concentrations of FeS: 0.2, 0.5, and 1 mmol/g, hereafter referred to as 0.2 CMC@MMT-FeS, 0.5 CMC@MMT-FeS, and 1.0 CMC@MMT-FeS, respectively. The soil Cr(VI) concentration decreased by 90.7% (from an initial concentration of 424.6 mg/kg to 39.4 mg/kg) after 30 days, following addition of 5% (composite–soil mass proportion) 1.0 CMC@MMT-FeS. When 2% 0.5 CMC@MMT-FeS was added to Cr(VI)-contaminated soil, the Cr(VI) removal efficiency, as measured in the leaching solution using the toxicity characteristic leaching procedure, was 90.3%, meeting the environmental protection standard for hazardous waste (5 mg/kg). The European Community Bureau of Reference (BCR) test confirmed that the main Cr fractions in the soil samples changed from acid-exchangeable fractions to oxidable fractions and residual fractions after 30 days of soil remediation by the composite. Moreover, the main complex formed during remediation was Fe(III)–Cr(III), based on BCR and X-ray photoelectron spectroscopy analyses. Biotoxicity of the remediated soils, using Vicia faba and Eisenia foetida, was analyzed and evaluated. Our results indicate that CMC@MMT-FeS effectively immobilizes Cr(VI), with widespread potential application in Cr(VI)-contaminated soil remediation.

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Section: Methodsmentioning

confidence: 99%

Immobilization of Cr(VI) in Soil Using a Montmorillonite-Supported Carboxymethyl Cellulose-Stabilized Iron Sulfide Composite: Effectiveness and Biotoxicity Assessment

Zhang

et al. 2020

IJERPH

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Assessment of the stabilization of heavy metal contaminants in soils using chemical leaching and an earthworm bioassay

Aziz

Lee

Han

et al. 2018

Environ Geochem Health

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Soil stabilization is a remedial technique that reduces the exposure of the soil environment to soil contaminants. Its efficacy can be assessed by determining whether the environmental availability of a contaminant decreases following treatment. We evaluated several chemical leaching treatments by assessing both contaminant leachability and bioaccumulation in the earthworm Eisenia fetida, and determined the most effective treatment for achieving soil stabilization. Soil samples contaminated with As, Cd, Cu, Pb, and/or Zn were collected from abandoned mine areas and stabilized by adding limestone and steel slag (5% and 2% w/w, respectively). All leaching and earthworm tests were conducted using both contaminated and stabilized soils. In addition to bioaccumulation in earthworms, several toxicity parameters (number of cocoons, growth changes, and survival rates) were also assessed to determine the effects of the treatments on the earthworms. The study showed that treatment of soil with EDTA-NHOAc resulted in a significant decrease in contaminant leachability following soil stabilization. There was an increase in survival and growth of earthworms exposed to the stabilized soil compared with those exposed to the non-stabilized soil. Bioaccumulation in earthworms was found to be statistically correlated with the leachability of As by EDTA-NHOAc. We conclude that limestone and steel slag effectively decreased the availability of heavy metals in the soil and reduced the toxicity to earthworms. Leaching with EDTA-NHOAc has the potential to be predictive in estimating the bioavailability of As in soils, but further studies are needed if it is to be proposed as a standard method.

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Main controlling factors and forecasting models of lead accumulation in earthworms based on low-level lead-contaminated soils

Tang

Ding

et al. 2018

Environ Sci Pollut Res

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To explore the main controlling factors in soil and build a predictive model between the lead concentrations in earthworms (Pb) and the soil physicochemical parameters, 13 soils with low level of lead contamination were used to conduct toxicity experiments using earthworms. The results indicated that a relatively high bioaccumulation factor appeared in the soils with low pH values. The lead concentrations between earthworms and soils after log transformation had a significantly positive correlation (R = 0.46, P < 0.0001, n = 39). Stepwise multiple linear regression analysis derived a fitting empirical model between Pb and the soil physicochemical properties: log(Pb) = 0.96log(Pb) - 0.74log(OC) - 0.22pH + 0.95, (R = 0.66, n = 39). Furthermore, path analysis confirmed that the Pb concentrations in the soil (Pb), soil pH, and soil organic carbon (OC) were the primary controlling factors of Pb with high pathway parameters (0.71, - 0.51, and - 0.49, respectively). The predictive model based on Pb in a nationwide range of soils with low-level lead contamination could provide a reference for the establishment of safety thresholds in Pb-contaminated soils from the perspective of soil-animal systems.

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Metabolic Responses of Eisenia Fetida to Individual Pb and Cd Contamination in Two Types of Soils

Cited by 17 publications

References 64 publications

Immobilization of Cr(VI) in Soil Using a Montmorillonite-Supported Carboxymethyl Cellulose-Stabilized Iron Sulfide Composite: Effectiveness and Biotoxicity Assessment

Immobilization of Cr(VI) in Soil Using a Montmorillonite-Supported Carboxymethyl Cellulose-Stabilized Iron Sulfide Composite: Effectiveness and Biotoxicity Assessment

Assessment of the stabilization of heavy metal contaminants in soils using chemical leaching and an earthworm bioassay

Main controlling factors and forecasting models of lead accumulation in earthworms based on low-level lead-contaminated soils

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