Effect of land use and soil properties in the feasibility of two sequential extraction procedures for metals fractionation

Gabarrón, María; Zornoza, Raúl; Martínez-Martínez, Silvia; Muñoz, V.; Faz, Ángel; Acosta, José A.

doi:10.1016/j.chemosphere.2018.11.114

Cited by 69 publications

(26 citation statements)

References 57 publications

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“…ese results agree with the findings of Zhou et al [12] and Agrafioti et al [16]. Gabarrón et al [38] and Zimmerman and Weindorf [39] observed that species distribution determines the leachability of heavy metals in stabilized soil. Zhang et al [40] showed that the availability and mobility of heavy metals in soil are related to the content of exchangeable forms.…”

Section: Speciation Distribution Of Cr and Cr(vi) In Stabilizedsupporting

confidence: 91%

Characteristics and Applications of Sewage Sludge Biochar Modified by Ferrous Sulfate for Remediating Cr(VI)‐Contaminated Soils

Zhang

Ning

et al. 2020

Advances in Civil Engineering

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Background. Soil contamination by hexavalent chromium is becoming a main environmental concern in China. This study developed a sewage sludge biochar modified by FeSO4 (CHBC) as a new reductant for Cr(VI)-contaminated soil. The effectiveness of CHBC-stabilized Cr(VI)-contaminated soil was investigated. Methods. Typical industrial Cr(VI)-contaminated soil in China was chosen as the medium. The total and Cr(VI) contents of the contaminated soil were 1014.6 and 973.5 mg/kg, respectively. The effectiveness of the Cr(VI)-contaminated soil stabilized by CHBC was investigated by the leaching test (US EPA method 1312), the simplified bioaccessibility extraction test (US EPA 2007 protocol and British Geological Survey), alkaline digestion (US EPA method 3060A), sequential extraction (BCR sequential extraction procedure), X-ray diffraction, and the risk assessment code test. Results. Results show that CHBC substantially reduced the leachability and Cr(VI) content of the contaminated soil. The leachability and content of Cr(VI) were lower than the thresholds of the Environmental Quality Standards of Soil in China for civil reuse and the China Environmental Quality Standards of surface water for civil use when the soil was stabilized with 10% dosage of CHBC. Conclusion. CHBC is highly efficient in stabilizing Cr(VI) and can effectively reduce the leachability and bioavailability of Cr in contaminated soil and thus feasible for stabilizing Cr(VI)-contaminated soil and shows potential for application in the field.

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Section: Speciation Distribution Of Cr and Cr(vi) In Stabilizedsupporting

confidence: 91%

Characteristics and Applications of Sewage Sludge Biochar Modified by Ferrous Sulfate for Remediating Cr(VI)‐Contaminated Soils

Zhang

Ning

et al. 2020

Advances in Civil Engineering

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“…The rest of the metal ions were also sulphate bonded, except for strontium in SARM 18. Trace elements such as Mn and Pb are known to dominate in coal as carbonate or sulphide minerals, hence are easily solubilized in acidic medium 5,31 . The rest of the metal ions were mostly sulphate bonded, except for Sr in SARM 18.…”

Section: Instrumentation the Proposed Sequential Extraction Methods Wmentioning

confidence: 99%

An improved microwave assisted sequential extraction method followed by spectrometric analysis for metal distribution determination in South African coal samples

Mketo

Nomngongo

2020

Sci Rep

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Some metal pollutants are corrosive in nature, are associated with fouling and slagging challenges of the coal boilers, are highly volatile and might cause air pollution and are catalyst poisoners during Fischer–Tropsch catalytic reaction. Therefore, this work describes an improved microwave-assisted sequential extraction (MW-ASE) method followed by ICP-OES/MS analysis for metal distribution determination in South African coal samples. The multivariate optimum conditions for each sequential step were 0.1 g, 200 °C and 5 min for sample amount, microwave temperature and extraction time, respectively. Under the optimum conditions, Ga, Sr and Ba were the only metals that showed solubility towards water, therefore, these metals are classified as highly mobile and eco-toxic under wet environmental conditions. Additionally, all the investigated metals showed solubility towards acidic conditions (HCl and HNO3). These results suggest that, most metal ions are predominantly bonded to sulphate, sulphide, and carbonate coal minerals. Alternatively, Ce, Cr and Y showed total extraction recoveries of ≤ 90%, confirming their strong affinity towards quartz coal minerals. In overall, the proposed MW-ASE method reported short extraction time (0.34 h), environmentally friendly reagents (H2O and diluted H2O2) and rapid multivariate optimization with acceptable extraction efficiencies (79–98%) and reproducibility (RSD ≤ 5%).

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“…spectrometry, conductivity, complexometry) often suffer from the complexity of sample preparation protocols, from interference effects associated with the aqueous matrix containing the element to be measured, or the impossibility to assess the bioavailable metal fraction, which is however essential for a proper estimate of toxicity effects on biota. [2][3][4][5][6] In order to develop reliable methods for a fine monitoring of metals bioavailability and toxicity, the scientific community has resorted to solutions derived from biotechnologies, such as whole-cell microbial biosensors. [7][8][9][10] The latter correspond to genetically modified microorganisms that emit a measurable physical or (electro)chemical signal in the presence of the target metal analyte.…”

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confidence: 99%

Decoding the Time-Dependent Response of Bioluminescent Metal-Detecting Whole-Cell Bacterial Sensors

Duval

Pagnout

2019

ACS Sens.

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The signal produced by aqueous dispersions of bioluminescent, metal-responsive whole-cell bacterial sensors is indicative of the concentration of bioavailable metal ions in solution. The conventional calibration-based strategy followed for measuring this concentration is however inadequate to provide any quantitative prediction of the cells response over time as a function of e.g. their growth features, their defining metal accumulation properties, or the physicochemical medium composition. Such an evaluation is still critically needed for assessing on a mechanistic level the performance of biosensors in terms of metal bioavailability and toxicity monitoring. Herein we report a comprehensive formalism unraveling how the dependence of bioluminescence on time is governed by the dynamics of metal biouptake, by the activation kinetics of lux-based reporter gene, by the ensuing rate of luciferase production, the kinetics of light emission and quenching. It is shown that bioluminescence signal corresponds to the convolution product between two time-dependent functions, one detailing the dynamic interplay of the above microand nanoscale processes, and the other pertaining to the change in concentration of photoactive cell sensors over time. Numerical computations illustrate how the shape and magnitude of the bioluminescence peak(s) are intimately connected to the dependence of the photoactive cells concentration on time and to the magnitudes of Deborah numbers that compare the relevant timescales of the biointerfacial and intracellular events controlling light emission. Explicit analytical expressions are further derived for practical situations where bioluminescence is proportional to the concentration of metal ions in solution. The theory is further quantitatively supported by experiments performed on luminescent cadmium-responsive lux-based Escherichia coli biosensors.Substituting the expressions of diff J and u J into eq 2, it is shown that u J is provided by eq 2 with   diff J t defined by (details in Supporting Information, SI-1)Bn J c t c t Metal concentration at the membrane surface (mol m -3 ). M,f c  Bulk concentration of bioavailable metal ions (mol m -3 ). M,f c  Dimensionless bulk concentration of bioavailable metal ions.f Time-dependent (dimensionless) function defined by eq 12.g Time-dependent (dimensionless) function defined by eq 10. diff J M diffusion flux at the membrane surface (mol m -2 s -1 ). u J Metal biouptake flux (mol m -2 s -1 ). u J  Maximum metal biouptake flux (mol m -2 s -1 ). u J Dimensionless M biouptake flux defined by u u / J J  . u,0

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Effect of land use and soil properties in the feasibility of two sequential extraction procedures for metals fractionation

Cited by 69 publications

References 57 publications

Characteristics and Applications of Sewage Sludge Biochar Modified by Ferrous Sulfate for Remediating Cr(VI)‐Contaminated Soils

Characteristics and Applications of Sewage Sludge Biochar Modified by Ferrous Sulfate for Remediating Cr(VI)‐Contaminated Soils

An improved microwave assisted sequential extraction method followed by spectrometric analysis for metal distribution determination in South African coal samples

Decoding the Time-Dependent Response of Bioluminescent Metal-Detecting Whole-Cell Bacterial Sensors

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