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Larestan University of Medical Sciences

Spatial and temporal variability of fluoride concentrations in groundwater resources of Larestan and Gerash regions in Iran from 2003 to 2010

(2016) Spatial and temporal variability of fluoride concentrations in groundwater resources of Larestan and Gerash regions in Iran from 2003 to 2010. Environ Geochem Health. pp. 25-37. ISSN 1573-2983 (Electronic) 0269-4042 (Linking)

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Official URL: https://www.ncbi.nlm.nih.gov/pubmed/25600228

Abstract

There is discrepancy about intervals of fluoride monitoring in groundwater resources by Iranian authorities. Spatial and temporal variability of fluoride in groundwater resources of Larestan and Gerash regions in Iran were analyzed from 2003 to 2010 using a geospatial information system and the Mann-Kendall trend test. The mean concentrations of fluoride for the 8-year period in the eight cities and 31 villages were 1.6 and 2.0 mg/l, respectively; the maximum values were 2.4 and 3.8 mg/l, respectively. Spatial, temporal, and spatiotemporal variability of fluoride in overall groundwater resources were relatively constant over the years. However, results of the Mann-Kendall trend test revealed a monotonic trend in the time series of one city and 11 villages for the 8-year period. Specifically, one city and three villages showed positive significant Kendall's Tau values, suggesting an upward trend in fluoride concentrations over the 8-year period. In contrast, seven villages displayed negative significant Kendall's Tau values, arguing for a downward trend in fluoride concentrations over the years. From 2003 to 2010, approximately 52 of the Larestan and Gerash areas have had fluoride concentrations above the maximum permissible Iranian drinking water standard fluoride level (1.4 mg/l), and about 116,000 people were exposed to such excess amounts. Therefore, our study supports for a close monitoring of fluoride concentrations from health authorities in monthly intervals, especially in villages and cities that showed positive trend in fluoride concentrations. Moreover, we recommend simultaneous implementation of cost-effective protective measures or interventions until a standard fluoride level is achieved.

Item Type: Article
Keywords: Drinking Water/*chemistry Environmental Exposure *Environmental Monitoring Fluorides/*analysis Groundwater/*chemistry Iran Water Pollutants, Chemical/*analysis Fluoride toxicity Groundwater resources Mann-Kendall trend test Spatial variability Spatiotemporal
Divisions: Education Vice-Chancellor Department > Faculty of Health > Department of Environmental Health Engineering
Page Range: pp. 25-37
Journal or Publication Title: Environ Geochem Health
Journal Index: Pubmed
Volume: 38
Number: 1
Identification Number: https://doi.org/10.1007/s10653-015-9676-1
ISSN: 1573-2983 (Electronic) 0269-4042 (Linking)
Depositing User: خانم موهبت شیوخی
URI: http://eprints.larums.ac.ir/id/eprint/106

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