The mobility of soluble fluoride in soils

Pickering, W.F.

doi:10.1016/0143-148x(85)90004-7

Cited by 181 publications

(108 citation statements)

References 42 publications

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“…But it should be noted that P affects the availability of F only in case of very high amounts of P in soil. Therefore, in our experiments a statistically significant increase of soluble F was detected in the both soil depths in accordance with the rates of the applied fertilizer, which presumably were induced by the decrease of soil pH (r=-0.92 p < 0.01) (Pickering, 1985;Barrow & Ellis, 1986;Loganathan et al, 2006). The significant increase of the amount of soluble F in the subsurface soil might be due to its leaching from the upper soil layer.…”

Section: )supporting

confidence: 75%

Phosphorus: Chemism and Interactions

Saljnikov¹,

Čakmak²

2011

Principles, Application and Assessment in Soil Science

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Section: )supporting

confidence: 75%

Phosphorus: Chemism and Interactions

Saljnikov¹,

Čakmak²

2011

Principles, Application and Assessment in Soil Science

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“…Fluoride can be released in the environment from phosphate fertilizers, which include fluorine as an impurity (Pickering, 1985;Skjelkvale, 1994). Phosphate fertilizers commonly contain from 1.3 to 3.0% fluorine (McLaughlin et al, 1996), much higher than those analyzed here.…”

Section: Pollutant Sourcesmentioning

confidence: 99%

“…5f). Air pollutants from coal combustion and phosphate fertilizers are common sources of F -in the environment (Pickering, 1985). The fertilizers contained soluble F -ranging from 60 to 255 mg/kg with an average value of 175 mg/kg, while, coal samples contained total F -ranging 5.12 to 20.1 mg/kg with an average value of 10.2 mg/ kg (Table 5).…”

mentioning

confidence: 99%

“…We also reported high concentra- tion of As (<10-90 µg/L), with SO 4 2-(5-14 mg/L) in the local rain (Farooqi et al, 2007). Although the concentration of SO 2 in ambient air is lower than the WHO standard, the presence of As in the air and rainwater support that those elements in the studied groundwater are partly derived via ambient air.Fluoride can be released in the environment from phosphate fertilizers, which include fluorine as an impurity (Pickering, 1985;Skjelkvale, 1994). Phosphate fertilizers commonly contain from 1.3 to 3.0% fluorine (McLaughlin et al, 1996), much higher than those analyzed here.…”

mentioning

confidence: 99%

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Distribution of highly arsenic and fluoride contaminated groundwater from east Punjab, Pakistan, and the controlling role of anthropogenic pollutants in the natural hydrological cycle

et al. 2007

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This paper reports the extended study from a previously-described study on As and F contaminated groundwater from a small village, Kalalanwala, in east Punjab, Pakistan (Farooqi et al., 2007). Of the 147 groundwater samples investigated, 91% exceeded the WHO standard (10 µg/L) for As and 75% exceeded the WHO standard (1.5 mg/L) for F -. The highly contaminated As (max. 2400 µg/L) and F -(max. 22.8 mg/L) groundwaters were found from shallow depths down to 30 m from the surface. The contaminated groundwaters are characterized by high pH (max. 8.8), alkalinity (HCO 3 -up to 1281 mg/L), SO 4 2-(max. 960 mg/L), Na + (max. 1058 mg/L) and maximum electric conductivity >4.6 mS/cm. Fluoride concentrations showed positive correlations with those of Na + and HCO 3 -and negative ones with Ca 2+and Mg 2+ . The alkaline waters were saturated with calcite in spite of the low Ca 2+ concentrations. Fluoride concentration is governed by fluorite solubility. Speciation analysis showed As is mostly in the form of As V . There was a positive correlation between As and pH, while there is no relationship between As vs. Fe and F -. Thus, the fluoride and As contamination occurred in the oxidizing and alkaline conditions of the groundwater. However, F -and As are derived from two or more sources. Suspected contaminant sources in the study area contained considerable amounts of F -and As; fertilizers (DAP, n = 5) contained leachable F -ranging from 53-255 mg/kg, and As 5-10 mg/kg, and coals (n = 8) contained F -ranging from 5-20 mg/kg. Sulfur isotopic ratios indicated that the high SO 4 2-in groundwater (3.2-7.0‰, CDT) is mainly derived from coal combusted atmospheric pollutants, fertilizers and household wastes. Nitrogen isotope data (8-30‰, Air) showed that NO 3 --N is attributed to animal waste distributed in the study area. The major chemical characteristics of the groundwaters are related with anthropogenic activities on the ground surface. The resultant major chemistry, especially highly alkaline and low Ca 2+ and Mg 2+ concentrations, must promote the high concentrations of F -and As in the studied groundwaters.Keywords: environmental pollution, phosphorus, semiarid climate, Indus Basin nitrogen and sulfur isotopes tion (WHO) guideline of As concentration in drinking water was reduced from 50 µg/L to 10 µg/L in 1993 (WHO, 1993). According to the WHO recommendation many developed countries changed the maximum admissible concentrations to 10 µg/L, however the developing countries, where arsenicosis is more widespread, are still using the previous guideline value (50 µg/L) due to the lack of facilities to analyze smaller concentrations precisely (Nickson et al., 2005). High F -groundwater causes fluorosis in several regions of the world; East Africa (Nanyaro et al., 1984), India (Rao et al., 1993), and Inner Mongolia in China (Wang et al., 1999). The drinking water limit (DWL) for F -is 1.5 mg/L (WHO, 1994). Fluoride in drinking water has a narrow optimum concentration range in relation to human health. It prevents dental caries in ...

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“…Estimated to be 13 th most abundant element in the earth's crust [1,2], fluoride is widely dispersed in nature, and the amount of fluoride presented naturally in groundwater is highly dependent upon the individual geological environment from which the water is obtained [3,4]. Fluoride occurs in a combined form in rocks and soils in a wide variety of minerals such as fluorspar (fluorite) (CaF 2 ), cryolite (Na 3 AlF 6 ), apatite (Ca 5 (PO 4 ) 3 F), topaz (Al 2 SiO 4 (F,OH) 2 ), amphiboles and micas [5].…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Fluoride Contents in Groundwater and Prevalence of Fluorosis in Tay Son District, Binh Dinh Province, Vietnam

Nguyet¹

2018

JST

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The communities within Binh Dinh province in the Central Vietnam are reliant on groundwater as their primary supply of domestic and potable water. Meanwhile, it is seriously contaminated with fluoride that causing fluorosis problem for people. This study aims to investigate the link between severity of dental fluorosis rate in a population and fluoride concentration in drinking water in Tay Son area. A total of 50 well-water samples were collected and 220 people were surveyed by questionnaire from 50 households at 3 villages: Tay Phu, Binh Tuong, Tay Giang of Tay Son district, Binh Dinh province, Vietnam. The quantitative assessment of severity of dental fluorosis was done by calculating the Community Fluorosis Index (CFI) using Dean's classification. Result of this study showed that fluoride concentration in well-water varied from 0.31 mg/L to 7.69 mg/L (mean 2.66 mg/L, SD: 2.18 mg/L) with 70 % of well-water samples above the maximum permissible limit of 1.5 mg/L of World Health Organization (WHO) drinking water standard. 100 % people surveyed was suffered from dental fluorosis and Dean scale of dental fluorosis ranged from level 2 to level 5. CFI varied from 3.45 to 4.13 above limit value (0.6). The community seriously suffered from dental fluorosis. The fluoride concentrations and Dean Index have high correlation (r = 0.580, p < 0.0001). Based upon results of this study, it is recommended that the government should supply drinking water with appropriate fluoride content for this community.

show abstract

The mobility of soluble fluoride in soils

Cited by 181 publications

References 42 publications

Phosphorus: Chemism and Interactions

Phosphorus: Chemism and Interactions

Distribution of highly arsenic and fluoride contaminated groundwater from east Punjab, Pakistan, and the controlling role of anthropogenic pollutants in the natural hydrological cycle

Relationship Between Fluoride Contents in Groundwater and Prevalence of Fluorosis in Tay Son District, Binh Dinh Province, Vietnam

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