Fluoride occurrence in environment, regulations, and remediation methods for soil: A comprehensive review

Prabhu, Subbaiah Muthu; Yusuf, Mohammad; Ahn, Yongtae; Park, Ho Bum; Choi, Jaeyoung; Amin, Mohammed A.; Yadav, Krishna Kumar; Jeon, Byong‐Hun

doi:10.1016/j.chemosphere.2023.138334

Cited by 17 publications

(5 citation statements)

References 73 publications

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“…One such global concern, particularly in India, is fluoride contamination. Industrial activities and synthetic fertilizers are the primary causes of fluoride compound contamination in the environment ( Muthu et al, 2023 ). This environmental risk may endanger plants and other organisms.…”

Section: Discussionmentioning

confidence: 99%

Tomato seed bio-priming with Pseudomonas aeruginosa strain PAR: a study on plant growth parameters under sodium fluoride stress

Singh,

Patani,

Patel

et al. 2024

Front. Microbiol.

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The primary goal of this experiment is to examine the effectiveness of Pseudomonas aeruginosa strain PAR as a rhizobacterium that promotes plant growth in mitigating the negative effects of fluoride-induced stress in tomato (Lycopersicon esculentum Mill.) plants. A total of 16 rhizobacterial strains were tested for plant growth-promoting (PGP) attributes, with isolates S1, S2, and S3 exhibiting different characteristics. Furthermore, growth kinetics studies revealed that these isolates were resilient to fluoride stress (10, 20, 40, and 80 ppm), with isolate S2 exhibiting notable resilience compared to the other two strains. Phylogenetic analysis revealed isolate S2 as P. aeruginosa strain PAR. Physiological analyses demonstrated that P. aeruginosa strain PAR had a beneficial impact on plant properties under fluoride stress, comprising seed germination, root length, shoot height, relative water content, and leaf area, the strain also impacted the buildup of glycine betaine, soluble sugar, and proline, demonstrating its significance in enhancing plant stress tolerance. In P. aeruginosa strain PAR-treated plants, chlorophyll content increased while malondialdehyde (MDA) levels decreased, indicating enhanced photosynthetic efficiency and less oxidative stress. The strain modified antioxidant enzyme action (catalase, ascorbate, glutathione reductase, peroxidase, and superoxide dismutase), which contributed to improved stress resilience. Mineral analysis revealed a decrease in sodium and fluoride concentrations while increasing magnesium, potassium, phosphorus, and iron levels, emphasizing the strain’s significance in nutrient management. Correlation and principal component analysis revealed extensive correlations between physiological and biochemical parameters, underscoring P. aeruginosa strain PAR’s multifaceted impact on plant growth and stress response. This study offers valuable information on effectively utilizing PGPR, particularly P. aeruginosa strain PAR, in fluoride-contaminated soils for sustainable agriculture. It presents a promising biological strategy to enhance crop resilience and productivity.

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Section: Discussionmentioning

confidence: 99%

Tomato seed bio-priming with Pseudomonas aeruginosa strain PAR: a study on plant growth parameters under sodium fluoride stress

Singh,

Patani,

Patel

et al. 2024

Front. Microbiol.

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“…Conventional F remediation strategies (soil washing method, electrokinetic, phytoremediation, chemical precipitation, and frothfloatation separation method) are costly, inefficient, and involve the risk of secondary contamination. 3 In contrast, the approach in this study is anticipated to provide novel insights for the risk management of fluorinated P fertilizers and fluorinated soil. F enrichment behavior and mechanisms are shown in Text S5.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

“…Certain fluoride (F) pollutants and phosphorus (P) nutrients persist in soil and groundwater because of anthropogenic industrial and agricultural activities. , F, widely distribute in soil (150–1576 mg/kg), significantly disturbs crop growth and human health due to high bioaccessibility and environmental transport efficiency. , Contrarily, as an essential element for plant growth, the high P availability determines the efficient utilization of crops in agricultural production. The interaction between F and P in soil is regulated by various factors, including biogeochemical cycling, soil mineralogy, and mineralization processes .…”

Section: Introductionmentioning

confidence: 99%

In Situ Evolution of Ionic Sites at Clay Mineral Interfaces Facilitates Fluoride and Phosphorus Mineralization

Zhang,

Zhu,

Niu

et al. 2024

Environ. Sci. Technol.

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Soil minerals influence the biogeochemical cycles of fluoride (F) and phosphorus (P), impacting soil quality and bioavailability to plants. However, the cooperative mechanisms of soil minerals in governing F and P in the soil environment remain a grand challenge. Here, we reveal the essential role of a typical soil mineral, montmorillonite (Mt), in the cycling and fate of F and P. The results show that the enrichment of metal sites on the Mt surface promotes the mineralization of F to the fluorapatite (FAP) phase, thereby remaining stable in the environment, simultaneously promoting P release. This differential behavior leads to a reduction in the level of F pollution and an enhancement of P availability. Moreover, solid-state NMR and HRTEM observations confirm the existence of metastable F−Ca−F intermediates, emphasizing the pivotal role of Mt surface sites in regulating crystallization pathways and crystal growth of FAP. Furthermore, the in situ atomic force microscopy and theoretical calculations reveal molecular fractionation mechanisms and adsorption processes. It is observed that a competitive relationship exists between F and P at the Mt interface, highlighting the thermodynamically advantageous pathway of forming metastable intermediates, thereby governing the activity of F and P in the soil environment at a molecular level. This work paves the way to reveal the important role of clay minerals as a mineralization matrix for soil quality management and offers new strategies for modulating F and P dynamics in soil ecosystems.

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“…Prominent sources of high-concentration fluoride-containing wastewater include the electronics industry (ranging from 300 to 4500 mg/L), semiconductor and display manufacturing (ranging from 400 to 1200 mg/L), and steel production (ranging from 6500 to 130,000 mg/L), with fluoride concentrations varying based on manufacturing processes [6][7][8]. Semiconductor industry wastewater is of particular concern, not only because of its high fluoride content but also because of the anticipated increase in its release to the environment in the future because of the rapid growth of the semiconductor industry worldwide [9,10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Calcium Fluoride Crystallization Process for Treatment of High-Concentration Fluoride-Containing Semiconductor Industry Wastewater

Sinharoy,

Lee,

Chung

2024

IJMS

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This study utilized a fluidized bed reactor (FBR) for fluoride removal from high-concentration fluoride-ion-containing simulated semiconductor industry wastewater and recovered high-purity CaF2 crystals. The effects of hydraulic retention time (HRT), pH, Ca2+ to F− ratio, upflow velocity, seed size and seed bed height were investigated by performing lab-scale batch experiments. Considering fluoride removal and CaF2 crystallization efficiency, 5 h HRT, pH 6, seed height of 50 cm and [Ca2+]/[F−] ratio of 0.55 (mol/mol) were found to be optimum. The effect of the interaction between the important process parameters on fluoride removal was further analyzed using response surface methodology (RSM) experimental design. The results showed that all the individual parameters have a significant impact (p = 0.0001) on fluoride removal. SEM-EDX and FTIR analysis showed the composition of the crystals formed inside FBR. HR-XRD analysis confirmed that the crystalline structure of samples was mainly CaF2. The results clearly demonstrated the feasibility of silica seed material containing FBR for efficient removal and recovery of fluoride as high-purity calcium fluoride crystals.

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Fluoride occurrence in environment, regulations, and remediation methods for soil: A comprehensive review

Cited by 17 publications

References 73 publications

Tomato seed bio-priming with Pseudomonas aeruginosa strain PAR: a study on plant growth parameters under sodium fluoride stress

Tomato seed bio-priming with Pseudomonas aeruginosa strain PAR: a study on plant growth parameters under sodium fluoride stress

In Situ Evolution of Ionic Sites at Clay Mineral Interfaces Facilitates Fluoride and Phosphorus Mineralization

Optimization of Calcium Fluoride Crystallization Process for Treatment of High-Concentration Fluoride-Containing Semiconductor Industry Wastewater

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