Remediation of Cd, Pb and as Co-contaminated Paddy Soil by Applying Different Amendments

Nong, Xinyu; Zhang, Chaolan; Chen, Hexiao; Rong, Qun; Gao, Hefeng; Jin, Xin

doi:10.1007/s00128-020-02940-8

Cited by 12 publications

(8 citation statements)

References 54 publications

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“…The mechanism appears to be based on an enhanced antioxidant response. (Nong et al, 2020) Soil amended with a mixture of bacteria showed decreased levels of bioavailable Cd and Pb in soil and reduced Cd, Pb and As in grain of brown rice but had no positive impact on plant growth.…”

Section: Tolerance Mechanism References Commentsmentioning

confidence: 91%

“…Results from rhizosphere-based approaches are more of a mixed bag; a long-term field trial with mycorrhizas revealed no beneficial effects (Gao et al, 2020). Soil amendment with a bacterial mixture (no details are given) lowered bioavailability of Cd and Pb in soil but surprisingly, the amendment increased bioavailability of As (Nong et al, 2020). The treatment did not affect plant growth or yield as such but did significantly reduce the level of all three metal(loid)s in the rice grain.…”

Section: Success Stories From the Fieldmentioning

confidence: 99%

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The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Podar

Maathuis

2021

Plant Cell & Environment

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Human activity and natural processes have led to the widespread dissemination of metals and metalloids, many of which are toxic and have a negative impact on plant growth and development. Roots, as the first point of contact, are essential in endowing plants with tolerance to excess metal(loid) in the soil. The most important root processes that contribute to tolerance are: adaptation of transport processes that affect uptake efflux and long‐distance transport of metal(loid)s; metal(loid) detoxification within root cells via conjugation to thiol rich compounds and subsequent sequestration in the vacuole; plasticity in root architecture; the presence of bacteria and fungi in the rhizosphere that impact on metal(loid) bioavailability; the role of root exudates. In this review, we provide details on these processes and assess their relevance on the detoxification of arsenic, cadmium, mercury and zinc in crops. Furthermore, we assess which of these strategies have been tested in field conditions and whether they are effective in terms of improving crop metal(loid) tolerance.

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Section: Tolerance Mechanism References Commentsmentioning

confidence: 91%

Section: Success Stories From the Fieldmentioning

confidence: 99%

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Podar

Maathuis

2021

Plant Cell & Environment

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show abstract

“…Results from rhizosphere-based approaches are more of a mixed bag; a long term field trial with mycorrhizas revealed no beneficial effects (Gao et al, 2010). Soil amendment with a bacterial mixture (no details are given) lowered bioavailability of Cd and Pb in soil but surprisingly, the amendment increased bioavailability of As (Nong et al, 2020). The treatment did not affect plant growth or yield as such but did significantly reduce the level of all three metal(loid)s in the rice grain.…”

Section: Success Stories From the Fieldmentioning

confidence: 99%

“…Lu et al, Tang et al, 2017Chang et al, 2020Ma et al, 2008Nong et al, 2020Hui et al, 2015Gao et al, 2010Wu et al, 2011 1) Search terms 'x+tolerance+field trial' were used where 'x' is As, Cd, Hg or Zn respectively. Within the search output, papers were included that were based on one or more of the following strategies: 'Metal(loid) liganding and vacuolar sequestration'; 'Alteration of transport'; 'Changes in root morphology/architecture'; or 'Effects on plant tolerance of plant-growth-promoting rhizobacteria/fungi'.…”

Section: Hosted Filementioning

confidence: 99%

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Podar

Maathuis

2021

Preprint

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Human activity and natural processes have led to widespread dissemination of metals and metalloids, many of which are toxic and have a negative impact on agronomic production. Roots, as the first point of contact, are essential in endowing plants with tolerance to excess metal(loid) in the soil. The most important root responses include: adaptation of transport processes that affect uptake, efflux and long distance transport of metal(loid)s; metal(loid) detoxification within root cells via conjugation to thiol rich compounds and subsequent sequestration in the vacuole; plasticity in root architecture; the presence of bacteria and fungi in the rhizosphere that impact on metal(loid) bioavailability; the role of root exudates. In this review we will provide details on these processes and assess their relevance for the detoxification of arsenic, cadmium, mercury and zinc. Furthermore, we will assess if any of these methodologies has been tested in field conditions and whether they are effective in terms of improving crop metal(loid) tolerance.

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“…In situ remediation of soils co‐contaminated with As and Pb is challenging because of the contrasting chemistries of the elements (Nong et al., 2020). Some of the challenges encountered are summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

In situ stabilization of arsenic and lead in contaminated soil using iron‐rich water treatment residuals

Rathnayake

Schwab

2022

J of Env Quality

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Arsenic (As) and lead (Pb) are common soil contaminants, environmentally hazardous, and threats to public health. Addition of soluble phosphate is known to be effective for in situ remediation of Pb-contaminated soils, but phosphate additions displace As from the soil particles and increase As concentration in soil solution. This study examined the dual use of iron (Fe) and phosphorus (P) amendments to soil that was highly contaminated with As and Pb. The test soil originated from a former smelter site in Utah with As and Pb concentrations of 66,400 mg Pb kg -1 and 7,520 mg As kg -1 . Goethite, ferrihydrite, and Fe-rich water treatment residuals (Fe-WTRs) were added to immobilize As, and soluble P was added to reduce Pb lability. The Fe amendments were added in Fe/As molar ratios ranging from 1:1 to 1:10, and P was added in P/Pb molar ratios ranging from 0.2:1 to 5:1. Iron-rich water treatment residuals were found to be the most effective Fe amendment. When Fe-WTR and P were added simultaneously, the P concentrations required to immobilize Pb resulted in increased mobilization of As, even when Fe-WTR were added at 10:1 Fe/As. However, when P was added first at 5:1 P/Pb, incubated for 1 wk, and then amended with Fe-WTR at 10:1 Fe/As, both Pb and As were significantly immobilized. The proposed process is a practical remediation approach to soils co-contaminated with Pb and As while encouraging re-use of Fe-WTR as a sustainable amendment.

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Remediation of Cd, Pb and as Co-contaminated Paddy Soil by Applying Different Amendments

Cited by 12 publications

References 54 publications

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

In situ stabilization of arsenic and lead in contaminated soil using iron‐rich water treatment residuals

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