The influence of fertilizers on the behavior of fluoride fractions in the alkaline soil

Moirana, Ruth Lorivi; Mkunda, Josephine Joseph; Paradelo, Marcos; Machunda, Revocatus L.; Mtei, Kelvin

doi:10.1016/j.jfluchem.2021.109883

Cited by 21 publications

(6 citation statements)

References 28 publications

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“…Total fluoride was determined according to McQuaker and Gurney's (1977) procedure [19]. Sequential extraction of fluoride was conducted as per our previous study [20]. In short, 2.5 g of the soil sample was placed into a 50 mL centrifuge tube and various species of fluoride were extracted by adding 25 ml of the extracting solutions as shown in Table 1.…”

Section: Discussionmentioning

confidence: 99%

“…e amount of nitrogen in the fermented fertilizer was observed to be decreased (3 mg/kg) compared to the dried seaweed (16.4 mg/kg). e nitrogen loss could be attributed to nitrate conversion to ammonium and other gaseous forms of nitrogen wasted by volatilization during drying [20].…”

Section: E Fermentation Processmentioning

confidence: 99%

“…As the pH drops, the amount of -OH ions in the soil solution interface decreases reducing its competition with fluoride ions on the solid phase of the soil which results to more fluoride being held by the soil. e Ex-F is bound to the exchangeable bases (Ca 2+ , Mg 2+ , K + , and Na + ) in the soil which are sensitive to pH changes, whereas the Fe/Mn-F representing fluoride-bound to Fe, Mn, and aluminum (Al) exist in their stable forms (unreactive) at high pH and become reactive (unstable) as pH drops [20]. erefore, as pH drops, they easily react with the soil's anionic species particularly fluoride which is strong electronegative.…”

Section: E Indirect Impact Of Fsw On the Bioavailability Of Fluoride ...mentioning

confidence: 99%

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Remediation of Soils Contaminated by Fluoride Using a Fermentation Product of Seaweed (Eucheuma cottonii)

Moirana

Mkunda

Paradelo

et al. 2022

Applied and Environmental Soil Science

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This study investigated the efficacy of fermented seaweed (Eucheuma cottonii) on the remediation of fluoride-contaminated soil. The soil was amended with either 1.25, 3.0, or 5.0% (w/w) fermented seaweed (FSW), parallel with the controls (0%). The amendment improved the physicochemical properties of the soil particularly pH regulated from strong alkaline (9.3) to neutral (7.0) which is essential for germination, crop growth, and yield. The amount of water soluble-fluoride (Ws-F) dropped from 81.7 ± 3.1 mg/kg to 42.7 ± 2.4, 33.7 ± 1.2, 19.6 ± 0.9, and 12 ± 1.3 mg/kg following 0, 1.25, 3, and 5% amendment dosage, respectively. Most of the Ws-F was converted into exchangeable fluoride (Ex-F) and to fluoride-bound to iron and manganese (Fe/Mn-F). Furthermore, the amendment also enhanced microbial mass and diversity in the soil. The FSW contains organic acids which participate in ionic bonding with the multivalent cations in the soil. The formed compound participates in ion exchange with clay or with anionic adsorption to positively charged clay sites at the edges. This interaction is further essential for enhancing the fluoride holding capacity of the soil. The use of seaweed reduced the bioavailability of fluoride in the agricultural soils and had positive effects on promoting soil fertility. However, further studies to observe its effects on crop performance is of significance.

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Section: Discussionmentioning

confidence: 99%

Section: E Fermentation Processmentioning

confidence: 99%

Section: E Indirect Impact Of Fsw On the Bioavailability Of Fluoride ...mentioning

confidence: 99%

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Remediation of Soils Contaminated by Fluoride Using a Fermentation Product of Seaweed (Eucheuma cottonii)

Moirana

Mkunda

Paradelo

et al. 2022

Applied and Environmental Soil Science

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“…The formation of iron, aluminum, and hydrogen complexes in natural soil also decreases the solubility of fluoride ions [172,177,183]. Moirana et al [184] observed that fluoride fraction is maximum in the water-soluble form; therefore, the bioavailability of fluoride in the soil is denoted as total fluoride, the sum of water-soluble fluoride ions, exchangeable free fluoride ions, iron/aluminum-bound fluoride ions, organic-matter-bound fluoride ions, and residual fluoride ions. Loganathan et al [177] reported that fluoride accumulation is significantly correlated with organic matter and aluminum oxide contents, as fluoride ions bind with aluminum oxides adsorbed onto organic matter present in the soil.…”

Section: Soilmentioning

confidence: 99%

Bioaccumulation of Fluoride in Plants and Its Microbially Assisted Remediation: A Review of Biological Processes and Technological Performance

et al. 2021

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Fluoride is widely found in soil–water systems due to anthropogenic and geogenic activities that affect millions worldwide. Fluoride ingestion results in chronic and acute toxicity, including skeletal and dental fluorosis, neurological damage, and bone softening in humans. Therefore, this review paper summarizes biological processes for fluoride remediation, i.e., bioaccumulation in plants and microbially assisted systems. Bioremediation approaches for fluoride removal have recently gained prominence in removing fluoride ions. Plants are vulnerable to fluoride accumulation in soil, and their growth and development can be negatively affected, even with low fluoride content in the soil. The microbial bioremediation processes involve bioaccumulation, biotransformation, and biosorption. Bacterial, fungal, and algal biomass are ecologically efficient bioremediators. Most bioremediation techniques are laboratory-scale based on contaminated solutions; however, treatment of fluoride-contaminated wastewater at an industrial scale is yet to be investigated. Therefore, this review recommends the practical applicability and sustainability of microbial bioremediation of fluoride in different environments.

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“…The adsorption capacity of uorine with Al 2 (SO 4 ) 3 was in the order of mildly salinesodic soil > moderately saline-sodic soil > severely saline-sodic soil, which was consistent with the result from the Langmuir model. Fluorine adsorption by soils largely depends on the basic characteristics of the soil (soil texture, pH, and organic matter content)(Harrington et al, 2003;Moirana et al, 2021). However, the difference in adsorption capacity was mainly related to the pH value.…”

mentioning

confidence: 99%

Improved adsorption of fluorine on three typical saline-sodic soils by increasing functional groups with Al 2 (SO 4 ) 3 incorporation

Zang

Wang

Huang

et al. 2022

Preprint

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Fluorine pollution in saline-sodic soils has become an important environmental problem, but little is known about the interaction between Al2(SO4)3 and fluorine when Al2(SO4)3 is used to improve saline-sodic soils. In this study, batch adsorption experiments were conducted to investigate the impacts of different saline-sodic soils with Al2(SO4)3 on fluorine adsorption, and the mechanisms of adsorption were characterized by SEM, BET, FTIR, and XPS analysis. The results showed that fluorine adsorption decreased with increasing soil salinity, and the addition of Al2(SO4)3 increased the adsorption of fluorine in soils. Among the three saline-sodic soils, Al2(SO4)3 contributed greatly to fluorine adsorption by mildly saline-sodic soils, with a range of 40.84%-69.70%. Fluorine adsorption isotherms could be properly described by the Langmuir and Freundlich models. At higher fluorine equilibrium concentrations, the adsorption amount of fluorine was greater for soils with Al→F. Both the soil porosity and the number of aggregates of saline-sodic soils were increased after adding Al2(SO4)3 for adsorption. Functional groups such as Si-O-Si, H-O-H, C-H, -OH, and Al-O-H were involved in the reaction process. Fluorine adsorption on saline-sodic soils refers to the ligand exchange and electrostatic adsorption, and F− replaces -OH on the soil surface. This work may provide a theoretical reference for the changes in fluorine chemical behavior when Al2(SO4)3 ameliorates saline-sodic soils.

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The influence of fertilizers on the behavior of fluoride fractions in the alkaline soil

Cited by 21 publications

References 28 publications

Remediation of Soils Contaminated by Fluoride Using a Fermentation Product of Seaweed (Eucheuma cottonii)

Remediation of Soils Contaminated by Fluoride Using a Fermentation Product of Seaweed (Eucheuma cottonii)

Bioaccumulation of Fluoride in Plants and Its Microbially Assisted Remediation: A Review of Biological Processes and Technological Performance

Improved adsorption of fluorine on three typical saline-sodic soils by increasing functional groups with Al 2 (SO 4 ) 3 incorporation

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