Modifying Effect of Soil Properties on Bio-Accessibility of As and Pb from Human Ingestion of Contaminated Soil

Lake, Loryssa; Basta, Nicholas T.; Barker, D. J.

doi:10.3390/geosciences11030126

Cited by 10 publications

(2 citation statements)

References 36 publications

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“…The influence of different P amendments, limited reported soil properties, and variety of methods employed diminished the ability of this study to determine the effect of soil properties. Studies have found significant correlations between bioaccessible Pb and soil properties ( 60 ) but this has not been researched specifically for soils remediated with P amendments. Further primary research is needed to ascertain the influence of soil properties on the ability of P to reduce bioaccessible soil Pb.…”

Section: Discussionmentioning

confidence: 99%

Using phosphate amendments to reduce bioaccessible Pb in contaminated soils: A meta-analysis

2022

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Measuring the reduction of in vitro bioaccessible (IVBA) Pb from the addition of phosphate amendments has been researched for more than 20 years. A range of effects have been observed from increases in IVBA Pb to almost 100% reduction. This study determined the mean change in IVBA Pb as a fraction of total Pb (AC) and relative to the IVBA Pb of the control soil (RC) with a random effects meta-analysis. Forty-four studies that investigated the ability of inorganic phosphate amendments to reduce IVBA Pb were identified through 5 databases. These studies were split into 3 groups: primary, secondary, and EPA Method 1340 based on selection criteria, with the primary group being utilized for subgroup analysis and meta-regression. The mean AC was approximately -12% and mean RC was approximately -25% for the primary and secondary groups. For the EPA Method 1340 group, the mean AC was -5% and mean RC was -8%. The results of subgroup analysis identified the phosphorous amendment applied and contamination source as having a significant effect on the AC and RC. Soluble amendments reduce bioaccessible Pb more than insoluble amendments and phosphoric acid is more effective than other phosphate amendments. Urban Pb contamination associated with legacy Pb-paint and tetraethyl Pb from gasoline showed lower reductions than other sources such as shooting ranges and smelting operations. Meta-regression identified high IVBA Pb in the control, low incubated soil pH, and high total Pb with the greater reductions in AC and RC. In order to facilitate comparisons across future remediation research, a set of minimum reported data should be included in published studies and researchers should use standardized in vitro bioaccessibility methods developed for P-treated soils. Additionally, a shared data repository should be created for soil remediation research to enhance available soil property information and better identify unique materials.

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Section: Discussionmentioning

confidence: 99%

Using phosphate amendments to reduce bioaccessible Pb in contaminated soils: A meta-analysis

2022

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“…After amending a soil to reduce Pb or As lability, the efficiency needs to be demonstrated, and chemical characterization protocols are commonly used. Various chemical methods have been tested to evaluate Pb and As mobility and bioavailability to mammals, plants, and microorganisms (Beyer et al., 2016; Lake et al., 2021). Total elemental concentration (e.g., USEPA Method 3050b; USEPA, 1996) is routinely used for risk assessment but is a poor indicator of bioavailability.…”

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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Soil pollution in the European Union – An outlook

Vieira,

Yunta,

Baragaño

et al. 2024

Environmental Science & Policy

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Modifying Effect of Soil Properties on Bio-Accessibility of As and Pb from Human Ingestion of Contaminated Soil

Cited by 10 publications

References 36 publications

Using phosphate amendments to reduce bioaccessible Pb in contaminated soils: A meta-analysis

Using phosphate amendments to reduce bioaccessible Pb in contaminated soils: A meta-analysis

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

Soil pollution in the European Union – An outlook

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