Biochars Reduce Mine Land Soil Bioavailable Metals

Ippolito, James A.; Berry, Clyde M.; Strawn, Daniel G.; Novak, Jeffrey M.; Levine, Joel S.; Harley, A.D.

doi:10.2134/jeq2016.10.0388

Cited by 83 publications

(47 citation statements)

References 39 publications

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“…Considering that recent work has demonstrated how higher pyrolysis temperatures produce biochars with greater metal sorption capacity (Rodríguez-Vila et al 2017), it may be that employing biochars produced at 550°C (which would have greater sorption capacity than those used in the present study) could overcome this theorised mobilisation effect. Hypotheses aside, the results appear comparable with those of Ippolito et al (2017) who observed varying degrees of success in reducing extractable Cd in mine contaminated soils treated with pine and tamarisk biochars. They found 0.01M CaCl2 extractable Cd was only modestly reduced in some soils treated with tamarisk biochar at application rates of 10% w/w (i.e.…”

Section: Immobilisation By Biocharsupporting

confidence: 80%

Evaluating cadmium bioavailability in contaminated rice paddy soils and assessing potential for contaminant immobilisation with biochar

Kosolsaksakul

Oliver

Graham

2018

Journal of Environmental Management

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Cadmium (Cd) contaminated soils from the Mae Sot district in northwest Thailand, a region in which rice Cd concentrations often exceed health limits (0.4 mg/kg) set by the World Health Organisation, were examined for isotopically exchangeable Cd (Cd E values using a 111 Cd spike) to determine how this rates as a predictor of rice grain Cd in comparison with soil total Cd and solution extractable Cd (using the commonly applied BCR scheme and, in an attempt to distinguish carbonate bound forms, the Tessier soil sequential extraction scheme reagents). Step 1 of the BCR scheme (0.11 M CH3COOH) and step 1 of the Tessier scheme (1M MgCl2) showed the highest R 2 values in regressions with rice Cd (91% and 90%, respectively), but all predictors were strongly linked to rice Cd (p<0.001) and could be used for prediction purposes. One soil, of the six tested, was an exception to this, where all predictors overestimated grain Cd by a factor of 2.5 to 5.7, suggesting that rice grain Cd had been restricted here by the differing flooding regime and subsequent changes to redox conditions. E values and Tessier step 1 extractions were closely related, indicating that these measurements access similar pools of soil Cd. Separately, the isotopic exchangeability (representing bioavailability) of Cd was also assessed in two soils amended with rice husk and miscanthus biochars (0, 1, 5, 10, 15 and 20% w/w) in order to assess the utility of the biochars as a soil amendment for immobilising Cd in-situ. One soil showed significant reductions in Cd E value at 5% rice husk biochar addition and at 15% miscanthus biochar addition however, based on the E value-rice grain Cd regression relationship previously established, the E values in the amended soils still predicted for a rice Cd concentration above the health limit. In the second soil, neither of the biochars successfully reduced the Cd E value. This indicates that further work is needed to customise biochar properties to suit specific soil and contaminant situations if they are to be used successfully for remediation of metal contaminated soils.

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Section: Immobilisation By Biocharsupporting

confidence: 80%

Evaluating cadmium bioavailability in contaminated rice paddy soils and assessing potential for contaminant immobilisation with biochar

Kosolsaksakul

Oliver

Graham

2018

Journal of Environmental Management

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“…In sandy acidic soil, increases of exchangeable/ soluble faction F1 were observed. Ippolito et al [39] showed that with increasing application rates of biochar, zinc tended to decrease in the residual fraction and increase in the soluble/exchangeable/carbonate fraction.…”

Section: Discussionmentioning

confidence: 99%

Effect of Biochar Application on Heavy Metal Mobility in Soils Impacted by Copper Smelting Processes

Medyńska‐Juraszek¹,

Ćwieląg-Piasecka²

2020

Pol. J. Environ. Stud.

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Biochar seems to be a very promising material for remediation, reducing heavy metal mobility in contaminated sites. However, the effect of its application on soil depends on biochar origin, pyrolysis condition, soil type and properties like initial pH or cation exchange capacity, and also on metal form and interactions. This makes prediction about successful remediation with biochar more difficult and a lot of attention should be paid to choose the proper material appropriate to soil conditions. The aim of our study was to evaluate wheat straw biochar application on multi-contaminated soil, to decrease their mobility and minimize the risk of heavy metal occurrence in the area impacted by copper smelting processes. The results of this study indicate that wheat straw biochar application can potentially reduce Cu, Pb, Zn or Cd mobility only in sandy or acidified soils due to the liming effect. In alkaline soils the effect of biochar application on metal immobilization was imperceptible. The effect of wheat straw biochar on heavy metal immobilization in multi-contaminated soils is more complex and cannot be defined as all-purpose material in remediation procedures.

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“…The PC and PL biochars were available commercially. Lodgepole pine (Pinus contorta) chips were transformed into biochar using a two-stage process as described [36]. In the first stage of the pyrolysis process, the chips were exposed to temperatures between 500 and 700 • C for <1 min under a very low O 2 atmosphere.…”

Section: Designer Biochar Preparation and Characterizationmentioning

confidence: 99%

Designer Biochars Impact on Corn Grain Yields, Biomass Production, and Fertility Properties of a Highly-Weathered Ultisol

et al. 2019

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There are mixed reports for biochars' ability to increase corn grain and biomass yields. The objectives of this experiment were to conduct a three-year corn (Zea mays L.) grain and biomass production evaluation to determine soil fertility characteristics after designer biochars were applied to a highly weathered Ultisol. The amendments, which consisted of biochars and compost, were produced from 100% pine chips (PC); 100% poultry litter (PL); PC:PL 2:1 blend; PC mixed 2:1 with raw switchgrass (Panicum virgatum; rSG) compost; and 100% rSG compost. All treatments were applied at 30,000 kg/ha to a Goldsboro loam sandy (Fine-loamy, siliceous, sub-active, thermic Aquic Paleudult). Annual topsoil samples were collected in 5-cm depth increments (0 to 15-cm deep) and pH was measured along with Mehlich 1 phosphorus (M1 P) and potassium (M1 K) contents. After three years of corn production, there was no significant improvement in the annual mean corn grain or biomass yields. Biochar, which was applied from PL and PC:PL 2:1 blend, significantly increased M1 P and M1 K concentrations down to 10-cm deep, while the other biochar and compost treatments showed mixed results when the soil pH was modified. Our results demonstrated that designer biochar additions did not accompany higher corn grain and biomass productivity.

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Biochars Reduce Mine Land Soil Bioavailable Metals

Cited by 83 publications

References 39 publications

Evaluating cadmium bioavailability in contaminated rice paddy soils and assessing potential for contaminant immobilisation with biochar

Evaluating cadmium bioavailability in contaminated rice paddy soils and assessing potential for contaminant immobilisation with biochar

Effect of Biochar Application on Heavy Metal Mobility in Soils Impacted by Copper Smelting Processes

Designer Biochars Impact on Corn Grain Yields, Biomass Production, and Fertility Properties of a Highly-Weathered Ultisol

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