The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil
Soil application of biochars has been shown to effectively immobilize potentially toxic elements (PTEs). Soil water regime can also affect PTE availability. No previous studies have examined the interactive effect of biochars and soil water regime on Pb availability. Therefore, this study investigat...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-01-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651320314639 |
| _version_ | 1818925329739153408 |
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| author | Hamid Reza Boostani Ailsa G. Hardie Mahdi Najafi-Ghiri Dariush Khalili |
| author_facet | Hamid Reza Boostani Ailsa G. Hardie Mahdi Najafi-Ghiri Dariush Khalili |
| author_sort | Hamid Reza Boostani |
| collection | DOAJ |
| description | Soil application of biochars has been shown to effectively immobilize potentially toxic elements (PTEs). Soil water regime can also affect PTE availability. No previous studies have examined the interactive effect of biochars and soil water regime on Pb availability. Therefore, this study investigated the effect of high and low temperature (300 and 600°C) biochars derived from cow manure (CB), municipal compost (MB) and licorice root pulp (LB) applied at 3 wt%, under two soil moisture regimes (field capacity (FC) and saturation (ST)) on Pb release kinetics and chemical fractions in a Pb-contaminated calcareous soil. Results showed that CB and MB treatments significantly enhanced Pb stabilization compared to LB, attributed to their favorable chemical properties (high P, ash, carbonate, oxidizable C content and high pH) which could promote Pb conversion into stable chemical fractions. Immobilization of Pb was enhanced under saturated conditions compared to FC by the treatments, which is attributed to increased soil pH, reduction of metal oxides and possible formation of sulfides. The most significantly effective treatments were the CB300, CB600 and MB600 treatments under ST, as indicated by significant decrease in soil Pb mobility factor from 29.1% (CL+FC) to 21.2–22.9%, and 11.7–16.3% increase in non-EDTA-extractable Pb. Results of this study demonstrate that combined application of high ash biochars and soil water saturation significantly enhances Pb immobilization in calcareous soil. |
| first_indexed | 2024-12-20T02:39:30Z |
| format | Article |
| id | doaj.art-7d36bfb1c73f4223945407c0732c55ae |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-20T02:39:30Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-7d36bfb1c73f4223945407c0732c55ae2022-12-21T19:56:21ZengElsevierEcotoxicology and Environmental Safety0147-65132021-01-01208111626The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soilHamid Reza Boostani0Ailsa G. Hardie1Mahdi Najafi-Ghiri2Dariush Khalili3Department of Range and Watershed Management, College of Agriculture and Natural Resources of Darab, Shiraz University, Darab 74591, Iran; Corresponding author.Department of Soil Science, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland 7602, South AfricaDepartment of Range and Watershed Management, College of Agriculture and Natural Resources of Darab, Shiraz University, Darab 74591, IranDepartment of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, IranSoil application of biochars has been shown to effectively immobilize potentially toxic elements (PTEs). Soil water regime can also affect PTE availability. No previous studies have examined the interactive effect of biochars and soil water regime on Pb availability. Therefore, this study investigated the effect of high and low temperature (300 and 600°C) biochars derived from cow manure (CB), municipal compost (MB) and licorice root pulp (LB) applied at 3 wt%, under two soil moisture regimes (field capacity (FC) and saturation (ST)) on Pb release kinetics and chemical fractions in a Pb-contaminated calcareous soil. Results showed that CB and MB treatments significantly enhanced Pb stabilization compared to LB, attributed to their favorable chemical properties (high P, ash, carbonate, oxidizable C content and high pH) which could promote Pb conversion into stable chemical fractions. Immobilization of Pb was enhanced under saturated conditions compared to FC by the treatments, which is attributed to increased soil pH, reduction of metal oxides and possible formation of sulfides. The most significantly effective treatments were the CB300, CB600 and MB600 treatments under ST, as indicated by significant decrease in soil Pb mobility factor from 29.1% (CL+FC) to 21.2–22.9%, and 11.7–16.3% increase in non-EDTA-extractable Pb. Results of this study demonstrate that combined application of high ash biochars and soil water saturation significantly enhances Pb immobilization in calcareous soil.http://www.sciencedirect.com/science/article/pii/S0147651320314639ImmobilizationPb chemical fractionsMobility factorPb release kinetics |
| spellingShingle | Hamid Reza Boostani Ailsa G. Hardie Mahdi Najafi-Ghiri Dariush Khalili The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil Ecotoxicology and Environmental Safety Immobilization Pb chemical fractions Mobility factor Pb release kinetics |
| title | The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil |
| title_full | The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil |
| title_fullStr | The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil |
| title_full_unstemmed | The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil |
| title_short | The effect of soil moisture regime and biochar application on lead (Pb) stabilization in a contaminated soil |
| title_sort | effect of soil moisture regime and biochar application on lead pb stabilization in a contaminated soil |
| topic | Immobilization Pb chemical fractions Mobility factor Pb release kinetics |
| url | http://www.sciencedirect.com/science/article/pii/S0147651320314639 |
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