Soil pH restricts the ability of biochar to passivate cadmium: A meta-analysis

Wei, Bo; Peng, Yunchang; Jeyakumar, Paramsothy; Lin, Longxin; Zhang, Dongliang; Yang, Meiyan; Zhu, Jinning; Lin, Carol Sze Ki; Wang, Hailong; Wang, Ziting; Li, Chong

doi:10.1016/j.envres.2022.115110

Cited by 37 publications

(6 citation statements)

References 73 publications

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“…In the case of Cd, the soil pH effect is only pronounced with PLB application, even considering that pH is the major factor influencing Cd bioavailability (Liang et al, 2022). However, the influence of the increased soil pH by biochar on the immobilization of Cd is dependent on the physicochemical properties of biochar (Wei et al, 2023). In our study, the negative relationship between pH and Cd for PLB is then explained by the greater buffering capacity offered by this biochar in comparison to SGB.…”

Section: Pls and Smlrmentioning

confidence: 54%

Biochar amendment of a metal contaminated soil partially immobilized Zn, Pb, and Cd and reduced ryegrass uptake

Antonângelo

Zhang

Sitienei

2023

Front. Environ. Sci.

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Soil heavy metals (HM) contamination threatens soil and water quality, which significantly affects humans and animals. This study focuses on the competitive immobilization of zinc (Zn), lead (Pb), and cadmium (Cd) in soils from a contaminated site using ryegrass (Lolium perenne) in a potting experiment amended with biochars. Increased rates of switchgrass- (SGB) and poultry litter-derived biochars (PLB) were applied before ryegrass cultivation. Soil HM phytoavailability and HM concentrations in plant shoots were determined. Multivariate regression models were used to evaluate the influence of several soil chemical attributes on the HM phytoavailability. The increased rates of both biochars reduced the Zn, Pb, and Cd availability (p < 0.001). Langmuir models showed that the maximum HM immobilization (IMAX) was 169.2 ± 29.5 mg kg–1 for Zn with SGB, and 20 ± 7.4 (Pb) and 1.08 mg kg–1 (Cd) with PLB. The extended Langmuir model (EL) showed competitive HM immobilization since there was a decrease in the IMAX of Zn (∼90 ± 28 mg kg–1 from SGB) and Cd (∼0.70 ± 0.21 mg kg–1). Negative values of Pb and Cd immobilization at low rates of SGB indicated an increase in those HM availabilities and preferential immobilization for Zn. The reduced Zn and Pb uptake in ryegrass shoots ranged from 70% to 98% and were optimum at rates of 0.50% ± 0.00%–0.60% ± 0.06% for both biochars, and 1.6% ± 0.4% of SGB for Cd. The stepwise multiple linear regression (SMLR) and partial least squares (PLS) revealed that pH and organic matter (OM) were the most responsible factors for reducing Zn bioavailability while OM was more impactful in decreasing Pb and Cd levels. This suggests that the preferential immobilization for Zn relies on its higher sensitivity to the pH increase. Also, the ubiquitous positive relationship among the metals studied shows that competitive immobilization is ceased at high rates of biochars application. Path analysis (PA) showed that pH and OM were the common contributors from both biochars to simultaneously affect Zn, Pb, and Cd availability regardless of the contrasting physicochemical properties of the two bioproducts. This work proved the potential of applying low rates of two contrasting feedstock-derived biochars to remediate the contaminants and safely grow ryegrass.

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Section: Pls and Smlrmentioning

confidence: 54%

Biochar amendment of a metal contaminated soil partially immobilized Zn, Pb, and Cd and reduced ryegrass uptake

Antonângelo

Zhang

Sitienei

2023

Front. Environ. Sci.

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“…The pH of the soil from both the study sites was tested separately for their physical properties and the concentration of metals present in both of them. The pH was measured using a pH meter (Analab, Gujarat, India) which is precise up to ±0.1 pH unit that is accepted to be adequate for field work [ 24 , 25 ]. The electrical conductivity (Analab, Gujarat, India) was measured in a conductivity cell by measuring the electrical resistance of 1:1 soil: water suspension with two electrodes placed 0.01 m apart [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Multiple Site Dissimilarities of Herbaceous Species Due to Coal Fly Ash Dumping Based Soil Heavy Metal Toxication

Singh

Gacem

et al. 2023

Toxics

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The present study analyzes the determinants and patterns of the regional, local, and differential plant diversity of two different sites with similar climatic but varied edaphic factors. This research was undertaken to study the plant diversity and population structure as a consequence of variation in the soil quality between two biotopes: Guru Ghasidas Vishwavidyalaya in Koni (site-I) and National Thermal Power Corporation in Sipat (site-II). The soil of site-I was found to be fertile and showed rich vegetation. On the other hand, the soil of site II was found to be contaminated with heavy metals, which impacts the flora of the region. The ecology of both sites was studied, and their quantitative and qualitative aspects were compared and contrasted. The abundance, density, and richness of the plants in site II were fairly lower than in site-I, which was confirmed by utilizing Simpson’s and Shannon’s diversity indices. Many of the species collected from site II were heavy metal accumulators and could also serve as indicators of heavy metal toxicity.

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“…Increased soil pH may also provide active sites enhancing Cd adsorption or immobilization. (Nguyen et al, 2023;Wei et al, 2023).…”

Section: Effect On Soil Properties and CD Fractionmentioning

confidence: 99%

Impacts of biochar-based amendment on soil cadmium immobilization, rice grain cadmium accumulation and yield

Han,

Wu,

Yang

et al. 2024

Preprint

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Cadmium (Cd) contamination in soil is of severe health and environmental concern because of its threat to human health, food safety, and ecosystem sustainability. The in situ stabilization of Cd has been recognized as a potentially economical technique for the rehabilitation of soil polluted with Cd. Biochar has recently received much attention as an eco-friendly and recyclable soil amendment, which is more beneficial for plant growth, soil health, and restoration of contaminated soil. An experiment was performed in the field to study the efficiency of three different types of biochar: maize straw biochar, bamboo biochar, and coconut shell activated carbon in combination with rape organic fertilizer (ROF), calcium magnesium phosphate fertilizer (CMPF), and fulvic acid (MFA), respectively, on soil Cd immobilization, Cd uptake by rice, and rice yield. The experiment indicated that the biochar-based amendments reduced soil Cd bioavailability and rice Cd content by 9.58%-27.06% and 19.30%-71.77%, respectively. The transformation of exchangeable Cd (Ex-Cd) to carbonate bound Cd (Ca-Cd), Fe-Mn oxide bond (Ox-Cd), and residual (Re-Cd) in soil accounted for the mitigation of Cd absorption and enrichment by rice. In addition, the biochar-based amendments altered soil physicochemical properties and promoted soil health. Biochar-based amendments enhanced Fe and Mn plaques by 47.31%-160.34% and 25.72%-73.09%, respectively. The correlation analysis revealed that leaf Cd and Fe/Mn plaques primarily controlled Cd uptake by rice, and soil pH, Eh, CEC, SOC, Fe/Mn plaques, and TP influenced Cd bioavailability in soil. This field study demonstrated that maize straw and bamboo biochar-based amendments had a higher benefit and were potentially applicable to ameliorating metal-contaminated agricultural soil.

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Soil pH restricts the ability of biochar to passivate cadmium: A meta-analysis

Cited by 37 publications

References 73 publications

Biochar amendment of a metal contaminated soil partially immobilized Zn, Pb, and Cd and reduced ryegrass uptake

Biochar amendment of a metal contaminated soil partially immobilized Zn, Pb, and Cd and reduced ryegrass uptake

Multiple Site Dissimilarities of Herbaceous Species Due to Coal Fly Ash Dumping Based Soil Heavy Metal Toxication

Impacts of biochar-based amendment on soil cadmium immobilization, rice grain cadmium accumulation and yield

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