Impact of low molecular weight organic acids on heavy metal(loid) desorption in biochar-amended paddy soil

Low molecular weight organic acids (LMWOAs) are important soil components and play a key role in regulating the geochemical behavior of heavy metal(loid)s. Biochar (BC) is a commonly used amendment that could change LMWOAs in soil. Here, four LMWOAs of oxalic acid (OA), tartaric acid (TA), malic aci...

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Veröffentlicht in:Environmental geochemistry and health 2024-08, Vol.46 (8), p.289-289, Article 289
Hauptverfasser: Huang, Qiuxiang, Chen, Wenzhe, Gao, Jinyan, Meng, Fande, Cai, Yongbing, Wang, Yan, Yuan, Guodong
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container_issue 8
container_start_page 289
container_title Environmental geochemistry and health
container_volume 46
creator Huang, Qiuxiang
Chen, Wenzhe
Gao, Jinyan
Meng, Fande
Cai, Yongbing
Wang, Yan
Yuan, Guodong
description Low molecular weight organic acids (LMWOAs) are important soil components and play a key role in regulating the geochemical behavior of heavy metal(loid)s. Biochar (BC) is a commonly used amendment that could change LMWOAs in soil. Here, four LMWOAs of oxalic acid (OA), tartaric acid (TA), malic acid (MA), and citric acid (CA) were evaluated for their roles in changing Cd and SB desorption behavior in contaminated soil with (S1-BC) or without BC (S1) produced from Paulownia biowaste. The results showed that OA, TA, MA, and CA reduced soil pH with rising concentrations, and biochar partially offset the pH reduction by LMWOAs. The LMWOAs reduced Cd desorption from the soil at low concentrations but increased Cd desorption at high concentrations, and CA was the most powerful in this regard. The LMWOAs had a similar effect on Sb desorption, and CA was the most effective species of LMWOAs. Adding BC to the soil affects Cd and Sb dynamics by reducing the Cd desorption but increasing Sb desorption from the soil and increasing the distribution coefficient ( K d ) values of Cd but lowering the K d values of Sb. This study helped understand the effects of LMWOAs on the geochemical behavior of Cd and Sb in the presence of biochar, as well as the potential risks of biochar amendment in enhancing Sb desorption from contaminated soil.
doi_str_mv 10.1007/s10653-024-02064-6
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subjects Acidic soils
Acids
Adsorption
biochar
Cadmium
Cadmium - chemistry
Charcoal
Charcoal - chemistry
Citric acid
Citric Acid - chemistry
Desorption
Earth and Environmental Science
Effectiveness
Environment
Environmental Chemistry
Environmental Health
Environmental Restoration and Remediation - methods
Geochemistry
Geographical distribution
Heavy metals
Hydrogen-Ion Concentration
Low concentrations
Low molecular weights
Malates - chemistry
Malic acid
Metals, Heavy - chemistry
Molecular Weight
Organic acids
Organic soils
Original Paper
Oryza - chemistry
Oxalic acid
Oxalic Acid - chemistry
paddy soils
Paulownia
polluted soils
Public Health
Soil
Soil - chemistry
Soil amendment
Soil contamination
Soil pH
Soil Pollutants - chemistry
Soil pollution
Soil Science & Conservation
species
Tartaric acid
Tartrates - chemistry
Terrestrial Pollution
wastes
title Impact of low molecular weight organic acids on heavy metal(loid) desorption in biochar-amended paddy soil
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