Phosphorus and Heavy Metal Attachment and Release in Sandy Soil Aggregate Fractions

Zhang, M. K.; He, Zhenli; Calvert, D. V.; Stoffella, P. J.; Yang, Xiaoe; Li, Y. C.

doi:10.2136/sssaj2003.1158

Cited by 75 publications

(32 citation statements)

References 29 publications

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“…In all cases, water-soluble Pb fraction was very limited (<1% of total Pb). In the RT and SA plots, we observed that almost 100% of the carbonate, exchangeable, and water-soluble Pb fractions that are considered as labile Pb forms were transformed to residual Pb during the immobilization processes, which accounted for lower Pb bioaccessibility, leachability, and plant uptake in the treated plots (Pierzynski and Schwab, 1993;Zhang et al, 2003). The analyses demonstrate that risk reduction of soil Pb was achieved through the transformation reactions of labile Pb species (water soluble, exchangeable, and carbonate) to relatively insoluble forms, presumably the formation of pyromorphite-like compounds.…”

Section: Resultsmentioning

confidence: 96%

Long-Term Risk Reduction of Lead-Contaminated Urban Soil by Phosphate Treatment

Tang

Yang

Goyne

et al. 2009

Environmental Engineering Science

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Soil metal contamination such as lead (Pb) is a threat to human health and the ecosystem. In situ phosphate (P) treatment is being evaluated as a cost-effective remedial strategy for reducing the human health and ecological risks associated with lead-contaminated soils. A long-term, integrated risk assessment was performed to examine the stability of P-immobilized soil Pb and verify the environmental safety of phosphate treatments. Urban soil in the Jasper County Superfund Site, Missouri, containing *4,000 mg Pb kg À1 , was treated with phosphoric acid (H 3 PO 4 ) at a rate of 10 g kg À1 by three application methods: rototilling (RT); surface application (SA); and pressure injection (PI). Soils and plant samples were collected 8-10 years posttreatment and analyzed for Pb bioaccessibilty, Pb leachability, plant uptake of Pb, microbial toxicity, chemical fractionation of Pb, and solid-phase Pb speciation. Results showed that, in all cases, P treatment significantly reduced soil bioaccessible and leachable Pb, and the reductions were maintained throughout the sampling period. Rototilling appeared to be the most effective for overall risk reductions. Lead uptake in plant tissues was positively correlated with soil Pb bioaccessibilty, and no significant negative impacts of P treatment on soil microbial toxicity were observed. Chemical fractionation analyses indicated that risk reduction by P treatment was achieved through the reactions that transformed labile Pb species to relatively insoluble forms, presumably through the formation of pyromorphite-like minerals. This study demonstrates that soil treatments using soluble P would result in long-term health and ecological risk reductions of Pb-contaminated soil without an adverse effect on the environment.

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Section: Resultsmentioning

confidence: 96%

Long-Term Risk Reduction of Lead-Contaminated Urban Soil by Phosphate Treatment

Tang

Yang

Goyne

et al. 2009

Environmental Engineering Science

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“…The soils are mostly sandy with sand content above 85%, acidic to neutral, with low organic matter content, and low buffering capacity (Zhang et al 2003b). Surface soil pH varied from 3.8 to 7.3, with an average of 5.5.…”

Section: Copper Accumulation In Relation To Citrus Planting Historymentioning

confidence: 99%

Accumulation and availability of copper in citrus grove soils as affected by fungicide application

Fan

Lena

et al. 2011

J Soils Sediments

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“…A study by Zhang et al (2003) on sandy soils showed very high concentrations of total P and metals in the less than 0.053 mm size class with much lower concentrations in the larger aggregates. In those sandy soils, the less than 0.053 mm size class was the only one to have an appreciable silt and clay content; the other aggregate sizes contained more than 86% sand.…”

Section: Vol 171~no 11 Phosphorus Fractions Among Different Soil Agmentioning

confidence: 96%

Phosphorus Fractions and Dynamics Among Soil Aggregate Size Classes of Organic and Conventional Cropping Systems

Green

Dao²,

Cavigelli³

et al. 2006

Soil Science

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Particulate nutrient transport from agricultural fields contributes to water quality degradation; however, insufficient data exist about potential bioactive P transport from erosion. Traditional measures of soil P such as total P or soil test P do not adequately assess the risk of water quality degradation due to particulate P because these measures do not necessarily reflect soil P bioactivity. To better understand the risk of water quality degradation due to sediment-associated P, we quantified the bioactive P fractions in five aggregate size classes from conventional no-till and chiseltill cropping systems as well as a tilled organic cropping system. Cropping system was not related to the concentration of bioactive P fractions in whole soils. However, aggregate size was related to bioactive P fraction concentrations. In general, macroaggregates had greater concentrations of bioactive P than did microaggregates and silt-and clay-sized particles across all cropping systems; the less than 0.053 mm aggregate size class had the lowest concentrations of bioactive P. To better understand the dynamics of these bioactive P fractions over time, we conducted an incubation study on the aggregates of the no-till system and quantified the bioactive P changes over time. Water-extractable P and complexed inorganic P concentrations did not change significantly during the incubation. However, complexed organic P concentrations increased up to 2-fold during the 56-day incubation. Using soil bioactive P fraction measurements from easily erodible aggregate sizes should aid in water quality degradation risk assessments. However, our research demonstrates the need to quantify the parameters that affect the dynamics of bioactive P fractions. (Soil Science 2006;171:874-885)

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Phosphorus and Heavy Metal Attachment and Release in Sandy Soil Aggregate Fractions

Cited by 75 publications

References 29 publications

Long-Term Risk Reduction of Lead-Contaminated Urban Soil by Phosphate Treatment

Long-Term Risk Reduction of Lead-Contaminated Urban Soil by Phosphate Treatment

Accumulation and availability of copper in citrus grove soils as affected by fungicide application

Phosphorus Fractions and Dynamics Among Soil Aggregate Size Classes of Organic and Conventional Cropping Systems

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