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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Lead Stabilization by Phosphate Amendments in Soil Impacted by Paint Residue
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Lead Stabilization by Phosphate Amendments in Soil Impacted by Paint Residue

机译：涂料残留物对土壤中磷酸盐的影响

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The addition of phosphate was evaluated for contaminant stabilization in soils impacted by lead paint residue. Soils sampled from 15 highway bridge sites in Indiana were screened based on residual lead concentrations from paint contamination. Two appropriate bridge sites were identified in Tippecanoe County, Indiana. Soluble phosphate was added to the soil at a mole ratio of 3:1 P:Pb. The efficacy of phosphate treatment was evaluated by a physiologically based extraction test (PBET), uptake of lead by sunflowers, and leaching of lead from soil columns. Sunflowers were established on both field sites, and the mean Pb concentration in the above-ground biomass indicated that the rate of uptake was similar to plants growing in uncontaminated soil. The second bioavailability assessment was the physiologically based extraction test, designed to evaluate heavy metal availability during ingestion. After 1 year at both sites, the addition of phosphate significantly reduced the concentrations of lead extracted by PBET, indicating that the lead in the amended soils had lower bioavailability than in the un-amended soils. In the column study, the contaminated soil produced the highest mass of leached Pb, and the addition of P reduced the mass of Pb in the leachate to similar levels found in the uncontaminated soil. Overall, the addition of soluble phosphate to these soils appears to be an effective approach for immobilizing Pb and reducing the associated bioaccessibility.
机译：评估了磷酸盐的添加对铅涂料残留物影响的土壤中污染物的稳定性。根据油漆污染中残留的铅含量，对从印第安纳州15个公路桥梁站点取样的土壤进行了筛选。在印第安纳州的蒂珀卡诺县发现了两个合适的桥梁站点。可溶性磷酸盐以3：1 P：Pb的摩尔比添加到土壤中。通过基于生理的提取试验（PBET），向日葵对铅的吸收以及土壤柱中铅的浸出来评估磷酸盐处理的功效。在两个田间都建立了向日葵，地上生物量中的平均Pb浓度表明其吸收速率与未污染土壤中生长的植物相似。第二项生物利用度评估是基于生理的提取试验，旨在评估摄入过程中的重金属利用度。在两个地点都放置1年后，磷酸盐的添加显着降低了PBET提取的铅的浓度，这表明改良土壤中的铅的生物利用度低于未改良土壤中的铅。在专栏研究中，受污染的土壤产生的淋溶铅质量最高，而磷的添加将渗滤液中的铅质量降低至未污染土壤中的相似水平。总体而言，向这些土壤中添加可溶性磷酸盐似乎是固定Pb并降低相关生物可及性的有效方法。

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