Effect of Phosphate Treatment on Pb Leachability in Contaminated Shooting Range Soils
| Autor: | A. O. Fayiga, U. K. Saha |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
021110 strategic
defence & security studies Chemistry Health Toxicology and Mutagenesis 0211 other engineering and technologies Soil Science Mineralogy 02 engineering and technology 010501 environmental sciences Contamination Phosphate 01 natural sciences Pollution Soil conditioner chemistry.chemical_compound Phosphorite Environmental chemistry Soil water Environmental Chemistry Leaching (metallurgy) Leachate Phosphoric acid 0105 earth and related environmental sciences |
| Zdroj: | Soil and Sediment Contamination: An International Journal. 26:115-126 |
| ISSN: | 1549-7887 1532-0383 |
| DOI: | 10.1080/15320383.2017.1245712 |
| Popis: | A cost-effective way to reduce lead released into the environment is through immobilization with readily available soil amendments. Leaching of Pb from four shooting range soils treated with two phosphate sources was evaluated in soil columns. Phosphate was applied at a P/Pb molar ratio of 4:1 with two-thirds of the P supplied from phosphate rock (PR) and one-third from phosphoric acid (PA). The soils were incubated for 18 hr and leached with toxicity characterization leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) fluids, respectively. PR/PA treatment reduced Pb in TCLP leachate to below regulatory limit of 5 mg/L after 18 hr of incubation. Reduction of Pb leached was more dependent on clay content than total Fe. PR/PA treatment had no effect on pH of TCLP leached soils, while it led to a drastic lowering of pH that mobilized Pb in SPLP leached soils. However, leaching of Pb reduced with time in SPLP leached soils because pH increased gradually. PR/PA treatment was... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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