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- W4309039863 abstract "Chemical immobilization using hydroxyapatite is one of the promising approaches to handling soil with high-level lead contamination. To enhance the effectiveness of lead immobilization by hydroxyapatite, it is important to understand how lead reacts with hydroxyapatite and forms pyromorphite, insoluble lead phases. The up-flow suction percolation test was conducted in this study by the combined application of an X-ray diffraction analysis using fine-grained and sandy soils. The aim of the test was to understand how the availability of lead and phosphorus depends on the formation of pyromorphite in water-unsaturated soil. The results revealed that the available phosphorus derived from hydroxyapatite remained in the sandy soil after the percolation test, but it did not remain in the fine-grained soil. The X-ray diffraction analysis was able to quantify the amounts of lead as pyromorphite formed during the water percolation test. The presence of hydroxyapatite suppressed 48% and 76% of the lead leaching from the contaminated fine-grained and sandy soils, respectively. In the fine-grained soil, much of the pyromorphite formed in the soil near the inflow side; however, as the distance from the inflow side increased, the pyromorphite formation decreased, and lead, as water-soluble, remained. In contrast, in the sandy soil, phosphorus added as hydroxyapatite was extracted, as available. Therefore, pyromorphite homogeneously formed regardless of the distance from the inflow side, resulting in no lead as the water-soluble phases. Thus, hydroxyapatite application for lead immobilization is suitable for soil with a low phosphorus sorption ability." @default.
- W4309039863 created "2022-11-21" @default.
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- W4309039863 date "2022-12-01" @default.
- W4309039863 modified "2023-09-26" @default.
- W4309039863 title "Formation of pyromorphite by hydroxyapatite during lead migration in soil with different phosphorus sorption abilities" @default.
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- W4309039863 doi "https://doi.org/10.1016/j.sandf.2022.101241" @default.
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