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Groundwater fluoride and dental fluorosis in southwestern Nigeria

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Abstract

This study was carried out to assess the fluoride levels of groundwater from open wells, consumed by the residents of three communities located in two distinct geological terrains of southwestern Nigeria. Fluoride concentration was determined using spectrophotometric technique, while analysis of other parameters like temperature, pH and total dissolve solids followed standard methods. Results of the analysis indicated that groundwater samples from Abeokuta Metropolis (i.e., basement complex terrain) had fluoride content in the range of 0.65 ± 0.21 and 1.20 ± 0.14. These values were found to be lower than the fluoride contents in the groundwater samples from Ewekoro peri-urban and Lagos metropolis where the values ranged between 1.10 ± 0.14–1.45 ± 0.07 and 0.15 ± 0.07–2.20 ± 1.41 mg/l, respectively. The fluoride contents in almost all locations were generally higher than the WHO recommended 0.6 mg/l. Analysis of Duncan multiple range test indicated that there is similarity in the level of significance of fluoride contents between different locations of same geological terrain at p ≤ 0.05. It was also observed that fluoride distribution of groundwater samples from the different geological terrain was more dependent on factors like pH and TDS than on temperature. The result of the analyzed social demographic characteristics of the residents indicated that the adults (between the age of 20 and >40 years) showed dental decay than the adolescent (<20 years). This signifies incidence of dental fluorosis by the high fluoride content in the drinking water of the populace. Further investigation on all sources of drinking water and other causes of tooth decay in the area is suggested.

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  1. Department of Environmental Management and Toxicology, College of Environmental Management Resources, University of Agriculture, P.M.B. 2240, Abeokuta, Nigeria

    A. M. Gbadebo

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  1. A. M. Gbadebo
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Gbadebo, A.M. Groundwater fluoride and dental fluorosis in southwestern Nigeria. Environ Geochem Health 34, 597–604 (2012). https://doi.org/10.1007/s10653-012-9455-1

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