Lead Immobilization and Phosphorus Availability in Phosphate-Amended, Mine-Contaminated Soils

Osborne, Lydia R.; Baker, Leslie L.; Strawn, Daniel G.

doi:10.2134/jeq2014.07.0323

Cited by 18 publications

(12 citation statements)

References 44 publications

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“…In addition, phosphate amendment may cause an increase in As mobility and bioavailability through competitive adsorption reactions. In this study, the effects of phosphate amendment of mine-waste contaminated soils on Pb immobilization and As mobilization were investigated [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

“…6 Effect of phosphate amendment on extractable As and P concentrations using Bray extraction solution, and extractable Pb concentrations using TCLP extraction solution. Soils are mine-contaminated wetland soils from Coeur d’Alene River Basin, Idaho (Data are from Osborne et al [ 45 ]) …”

Section: Resultsmentioning

confidence: 99%

“…Soil samples for the phosphate amendment remediation trials were collected from the Black Rock Slough located on the floodplain adjacent to the CdA River in Kootenai County, Idaho [ 45 ]. Four samples were collected and composited.…”

Section: Methodsmentioning

confidence: 99%

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Review of interactions between phosphorus and arsenic in soils from four case studies

Strawn

2018

Geochem Trans

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102

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Arsenic is a non-essential element that poses risks in many environments, including soil, groundwater, and surface water. Insights into the environmental biogeochemistry of As can be gained by comparing As and P reaction processes. Arsenic and P are chemical analogues, and it is proposed that they have similar chemical behaviors in environmental systems. However some chemical properties of As and P are distinct, such as redox reactions, causing the biogeochemical behavior of the two elements to differ. In the environment, As occurs as either As(V) or As(III) oxyanions (e.g., AsO43− or AsO33−). In contrast, P occurs predominantly as oxidation state five plus; most commonly as the orthophosphate ion (PO43−). In this paper, data from four published case studies are presented with a focus on P and As distribution and speciation in soil. The goal is show how analyzing P chemistry in soils can provide greater insights into As reaction processes in soils. The case studies discussed include: (1) soil developed from shale parent material, (2) mine-waste impacted wetland soils, (3) phosphate-amended contaminated soil, and (4) plants grown in biochar-amended, mine-contaminated soil. Data show that while P and As have competitive reactions in soils, in most natural systems they have distinct biogeochemical processes that create differing mobility and bioavailability. These processes include redox reactions and rhizosphere processes that affect As bioavailability. Results from these case studies are used as examples to illustrate how studying P and As together allows for enhanced interpretation of As biogeochemical processes in soils.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Review of interactions between phosphorus and arsenic in soils from four case studies

Strawn

2018

Geochem Trans

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102

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“…Secondly, available P and OM could reduce the availability and toxicity of HMs, thus indirectly stimulating soil microbial activity. For instance, phosphate could react with soil mobile HMs, forming more insoluble precipitates such as pyromorphite and reducing the bioavailability of HMs [34]; OM has high surface area and adsorption capacity for cations [35], decreasing their availability [36].…”

Section: Soil Microbial Activitiesmentioning

confidence: 99%

A combined approach to evaluate activity and structure of soil microbial community in long-term heavy metals contaminated soils

Wang

Yuan

Yao

2017

Environmental Engineering Research

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In the present study, long-term heavy metals (HMs) contaminated soil samples from a well-known Pb/Zn smelting area in the southwest of China were collected, and physicochemical and biological characteristics of these samples were evaluated. Soil samples contained different concentrations of HMs, namely Pb, Zn, Cu, and Cd. Enzyme activity analyses combined with microcalorimetric analysis were used for soil microbial activity evaluation. Results showed that two soil samples, containing almost the highest concentrations of HMs, also shared the greatest microbial activities. Based on correlation coefficient analysis, high microbial activity in heavily HMs contaminated soil might be due to the high contents of soil organic matter and available phosphorus in these samples. High-throughput sequencing technique was used for microbial community structure analysis. High abundance of genera Sphingomonas and Thiobacillus were also observed in these two heavily contaminated soils, suggesting that bacteria belonging to these two genera might be further isolated from these contaminated soils and applied for future studies of HMs remediation. Results of present study would contribute to the evaluation of microbial communities and isolation of microbial resources to remediate HMs pollution.

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“…The formation of Pb phosphates, and particularly pyromorphite, can immobilize and limit Pb solubility in soil that is strongly contaminated by Pb (Scheckel & Ryan, ; Xie & Giammar, ; Bosso et al ., ; Li et al ., ). Consequently, the extractability of Pb may be reduced in severely Pb‐contaminated soil where soluble phosphates have been added (Stilwell & Ranciato, ; Osborne et al ., ). Conditions that are most conducive to the spontaneous and efficient formation of pyromorphite from more labile forms are low pH combined with very soluble phosphate and Pb (Chrysochoou et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Extractability of Pb in urban gardens and orchards linked to soil properties

McBride

2016

European J Soil Science

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Summary The hypothesis that lability and bioavailability of lead (Pb) in strongly contaminated soil is limited by interaction with phosphate and organic matter was tested on soil from urban gardens and orchards by extracting available Pb and P with the modified Morgan's extractant (ammonium acetate, pH 4.8) and measuring organic matter by loss‐on‐ignition. The extractable fraction of total Pb was larger in general in the urban garden than orchard soil, which indicates greater lability in urban garden soil than was expected if insoluble Pb phosphates such as pyromorphite were limiting Pb extractability. The extractable Pb fraction was generally larger in soil with greater total Pb, an indication that soil with large Pb concentrations contained Pb in more labile forms than soil with small concentrations. Larger organic matter contents in garden soil reduced the extractable fraction of Pb, but large available phosphate concentrations did not have this effect. The results indicate that soil organic matter has an important role in limiting Pb extractability in strongly contaminated soil, whereas a large soil phosphate concentration does not, despite the expectation that formation of insoluble Pb phosphates would reduce Pb lability. Nevertheless, a spatial association of P with Pb in Pb‐rich particles identified in urban garden soil with the electron microprobe suggests that Pb phosphates have formed in such soil from more reactive forms of Pb. The hypothesis is that a small fraction only of the total Pb in the urban soil occurs in a phosphate phase, and more acid‐labile forms of Pb co‐exist with insoluble phosphates for long time periods. Highlights Lead bioavailability in soil can potentially be reduced with phosphate. Hypothesis is that soil Pb availability is limited by available phosphate or total organic matter. Large soil organic matter content correlated with reduced Pb extractability, but not large available phosphorus content. Lead‐phosphate phases did not appear to limit soil Pb extractability.

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Lead Immobilization and Phosphorus Availability in Phosphate-Amended, Mine-Contaminated Soils

Cited by 18 publications

References 44 publications

Review of interactions between phosphorus and arsenic in soils from four case studies

Review of interactions between phosphorus and arsenic in soils from four case studies

A combined approach to evaluate activity and structure of soil microbial community in long-term heavy metals contaminated soils

Extractability of Pb in urban gardens and orchards linked to soil properties

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