Soil washing with solutions of humic substances from manure compost removes heavy metal contaminants as a function of humic molecular composition

Piccolo, Alessandro; Spaccini, Riccardo; Martino, Antonio; Scognamiglio, Francesco; Meo, Vincenzo Di

doi:10.1016/j.chemosphere.2019.03.019

Cited by 94 publications

(46 citation statements)

References 38 publications

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“…As is a type of soluble organic molecule with low pH, HA generally enhances the bioavailability and mobility of heavy metals in soil [30,46,47]. As expected, HA decreased soil pH, but resulted in higher available Cr and Fe concentrations in soil when applied in combination, as opposed to the nZVI alone (Figure 2), indicating that the HA-induced decrease in Cr(VI) was mainly from reduction of Cr(VI) to Cr(III) [32].…”

Section: Discussionsupporting

confidence: 55%

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Sun

Zheng

Wang

et al. 2020

Toxics

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Nano-scale zero-valent iron (nZVI) is among the most common nanoparticles widely used for the treatment of various environmental contaminants. However, little is known about the combined effects of nano-zero-valent iron (nZVI) and other soil amendments on soil remediation and plant performance. For the first time, we studied the remediation of Cr(VI)-contaminated soil using bare nZVI (B-nZVI) and starch-supported nZVI (S-nZVI) in combination with either biochar (BC) or humic acid (HA), and the consequent effects on plant growth and Cr accumulation. Both S-nZVI and B-nZVI decreased the contents of Cr(VI) and available Cr in soil, but increased available Fe content, with S-nZVI generally showing more pronounced effects at a higher dose (1000 mg/kg). B-nZVI exerted no inhibition and even stimulation on plant growth, but 1000 mg/kg S-nZVI produced significant phytotoxicity, resulting in decreased plant growth, low chlorophyll content in leaves, and excessive accumulation of Fe in roots. Each nZVI decreased shoot and root Cr concentrations. BC and HA produced synergistic effects with nZVI on Cr(VI) removal from soil, but HA decreased soil pH and increased the availability of Cr and Fe, implying a potential environmental risk. Addition of BC or HA did not alter the effects of either nZVI on plant growth. In conclusion, combined application of 100 mg/kg nZVI and BC could be an ideal strategy for the remediation of soil contaminated with Cr(VI), whereas high-dose S-nZVI and HA are not recommended in the remediation of agricultural soils for crop production or in the phytostabilization of Cr(VI).

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Section: Discussionsupporting

confidence: 55%

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Sun

Zheng

Wang

et al. 2020

Toxics

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“…1,2 Multiple heavy metals (including Cd, Cr, Pb, Zn and Hg) 3,4 represent a threat to the environment and human health due to their persistence in soil and potential uptake by crops. 5 Therefore, the remediation of soil contaminated by heavy metals, particularly in combination with different pollutants, is of practical signicance. 6 Various techniques, including physical methods (soil replacement, thermal treatment), chemical methods (solidication/ stabilization, soil washing) and biological methods (microbial remediation, phytoremediation) have been conducted for solving this environmental issue.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of multiple heavy metals from soil by washing with citric acid and ferric chloride

et al. 2020

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“… b Assuming that the functionality correlates with the sum of the proportions of carboxyl and phenolic groups (Klucakova & Kolajova, 2014; Piccolo et al., 2019). …”

Section: Resultsmentioning

confidence: 99%

“…The same letters on the HA and FA are not significantly different according to Tukey's multiple range test at P > 0.05. # Assuming that the functionality correlates with the sum of the proportions of carboxyl and phenolic groups (Klucakova and Kolajova, 2014;Piccolo et al, 2019)…”

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Validation and comparisons of NaOH and Na₄P₂O₇ extraction methods for the characterization of organic amendments

Audette

Longstaffe

Gillespie

et al. 2021

Soil Science Soc of Amer J

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The objectives of this study are to compare the chemical properties of organic matter (OM) in alkaline extracts of turkey litter compost, source-separated organic compost and biosolid pellets, and to validate the use of humic acids (HA) for analyzing the functionality, i.e., the ability to complex with nutrients, of OM. The humic fractions, including humic acids (HA), fulvic acids (FA) and alkaline non-dissolved fraction (humin), were isolated either with NaOH or Na 4 P 2 O 7 (PyroP) and the chemical properties were analyzed by solid-state 13 C NMR spectroscopy. The study showed that the proportions of each functional group of the combination of HA, FA and humin were essentially identical to that of their HCl-treated original materials, except for a lower recovery of O-alkyl groups. Although the yield of HA extracted with PyroP was lower than that with NaOH, their spectral characteristics were not significantly different. The functionality of the OM, assuming a correlation with the sum of the proportions of carboxyl and phenolic groups, was higher in both HA and FA than that in humin. Based on the proportion and functionality of the HA in the OM, we conclude that the use of HA extracted with either NaOH or PyroP is valid for studies of OM functionality. The study also shows that the functionality and stability of OM are highly source dependent. We predict that amendments of the more humified turkey litter compost would have higher potential to increase SOM levels and retain nutrients compared to the source-separated organic compost and biosolid pellets.

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Soil washing with solutions of humic substances from manure compost removes heavy metal contaminants as a function of humic molecular composition

Cited by 94 publications

References 38 publications

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Simultaneous removal of multiple heavy metals from soil by washing with citric acid and ferric chloride

Validation and comparisons of NaOH and Na₄P₂O₇ extraction methods for the characterization of organic amendments

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Soil washing with solutions of humic substances from manure compost removes heavy metal contaminants as a function of humic molecular composition

Cited by 94 publications

References 38 publications

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Remediation of Cr(VI)-Contaminated Soil by Nano-Zero-Valent Iron in Combination with Biochar or Humic Acid and the Consequences for Plant Performance

Simultaneous removal of multiple heavy metals from soil by washing with citric acid and ferric chloride

Validation and comparisons of NaOH and Na4P2O7 extraction methods for the characterization of organic amendments

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Product

Resources

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Validation and comparisons of NaOH and Na₄P₂O₇ extraction methods for the characterization of organic amendments