Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes

Abstract Study on the form partitioning and content of heavy metals in soil particles with different sizes is crucial for preventing and controlling heavy metals pollution, but few studies regard soil contaminated by heavy metals as a homogeneous body. In this study (Fig. 1), goat manure, lime and p...

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Autores principales: Shuai Zhao, Xiongfei Cai, Ji Wang, Ding Li, Shijie Zhao, Xinjie Yu, Die Xu, Shuai Zhang
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Publicado: Nature Portfolio 2021
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spelling oai:doaj.org-article:e6568906039b43579c81bb28c61037552021-11-21T12:17:52ZThree types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes10.1038/s41598-021-01685-62045-2322https://doaj.org/article/e6568906039b43579c81bb28c61037552021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01685-6https://doaj.org/toc/2045-2322Abstract Study on the form partitioning and content of heavy metals in soil particles with different sizes is crucial for preventing and controlling heavy metals pollution, but few studies regard soil contaminated by heavy metals as a homogeneous body. In this study (Fig. 1), goat manure, lime and phosphate were used to stabilize exogenous lead (Pb). These soil passivators’ differential effects on total Pb and Pb with different chemical forms in soil particles of different sizes as well as Pb immobilization in soil were investigated. By passivation experiment in laboratory for 45 days, the passivation effect of the single and combined application treatments on exogenous Pb and partitioning characteristics were analyzed and compared. The characterization method of fine sand microstructure and mineral composition analysis was used. The results showed that the single application of P5 and combined application of LP5 had optimum passivation efficiency. The content of DTPA-Pb was reduced with P5 by 65.27% and the percentage of available Pb decreased significantly in soil particles of the four sizes. The content of TCLP-Pb and available Pb (weak acid extraction and reducible Pb) significantly decreased by 71.60 and 25.12% respectively after the application of LP5 in the original soil. Furthermore, most of the total Pb was enriched in coarse sand and clay, while its content was lower in fine sand and silt. The combined application treatment of GL5 significantly increased the content of weak acid extractable and reducible Pb in fine sand, silty sand and clay. Through SEM and XRD analysis, it was found that the diffraction peak of P5 treatment groups might be related to the formation of insoluble Pb that contained compounds, which were mainly mineral components, including quartz, feldspar and mica, and LP showed a big potential in the study on passivation of heavy metal Pb-contaminated soil in the natural environment. In conclusion, further studies on the different dosage and metal-contamination levels as well as different combination forms of passivators should be considered under natural conditions, the selection of suitable passivators according to soil texture is of great significance for remediation of Pb-contaminated soil.Shuai ZhaoXiongfei CaiJi WangDing LiShijie ZhaoXinjie YuDie XuShuai ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Shuai Zhao
Xiongfei Cai
Ji Wang
Ding Li
Shijie Zhao
Xinjie Yu
Die Xu
Shuai Zhang
Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
description Abstract Study on the form partitioning and content of heavy metals in soil particles with different sizes is crucial for preventing and controlling heavy metals pollution, but few studies regard soil contaminated by heavy metals as a homogeneous body. In this study (Fig. 1), goat manure, lime and phosphate were used to stabilize exogenous lead (Pb). These soil passivators’ differential effects on total Pb and Pb with different chemical forms in soil particles of different sizes as well as Pb immobilization in soil were investigated. By passivation experiment in laboratory for 45 days, the passivation effect of the single and combined application treatments on exogenous Pb and partitioning characteristics were analyzed and compared. The characterization method of fine sand microstructure and mineral composition analysis was used. The results showed that the single application of P5 and combined application of LP5 had optimum passivation efficiency. The content of DTPA-Pb was reduced with P5 by 65.27% and the percentage of available Pb decreased significantly in soil particles of the four sizes. The content of TCLP-Pb and available Pb (weak acid extraction and reducible Pb) significantly decreased by 71.60 and 25.12% respectively after the application of LP5 in the original soil. Furthermore, most of the total Pb was enriched in coarse sand and clay, while its content was lower in fine sand and silt. The combined application treatment of GL5 significantly increased the content of weak acid extractable and reducible Pb in fine sand, silty sand and clay. Through SEM and XRD analysis, it was found that the diffraction peak of P5 treatment groups might be related to the formation of insoluble Pb that contained compounds, which were mainly mineral components, including quartz, feldspar and mica, and LP showed a big potential in the study on passivation of heavy metal Pb-contaminated soil in the natural environment. In conclusion, further studies on the different dosage and metal-contamination levels as well as different combination forms of passivators should be considered under natural conditions, the selection of suitable passivators according to soil texture is of great significance for remediation of Pb-contaminated soil.
format article
author Shuai Zhao
Xiongfei Cai
Ji Wang
Ding Li
Shijie Zhao
Xinjie Yu
Die Xu
Shuai Zhang
author_facet Shuai Zhao
Xiongfei Cai
Ji Wang
Ding Li
Shijie Zhao
Xinjie Yu
Die Xu
Shuai Zhang
author_sort Shuai Zhao
title Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
title_short Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
title_full Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
title_fullStr Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
title_full_unstemmed Three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
title_sort three types of passivators on the stabilization of exogenous lead-contaminated soil with different particle sizes
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/e6568906039b43579c81bb28c6103755
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