Application of Soil Composition for Inferring Fluoride Variability in Volcanic Areas of Mt. Meru, Tanzania
International Journal of Environmental Monitoring and Analysis
Volume 2, Issue 5, October 2014, Pages: 231-238
Received: Aug. 29, 2014;
Accepted: Sep. 13, 2014;
Published: Sep. 20, 2014
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John Mkungu, Department of Water, Environmental Science and Engineering, The Nelson Mandela- African Institution of Science and Technology, Arusha, Tanzania
Revocatus Lazaro Machunda, Department of Water, Environmental Science and Engineering, The Nelson Mandela- African Institution of Science and Technology, Arusha, Tanzania
Alfred Nzibavuga Nyarubakula Muzuka, Department of Water, Environmental Science and Engineering, The Nelson Mandela- African Institution of Science and Technology, Arusha, Tanzania
Predicting fluoride levels in water within fluoride endemic areas is an issue of high significance. As a result several methods including mathematical models have been reported to suit the task. However, most of these methods have limited practicality to low income communities. This study presents the potentials of employing soil characteristics to predict the level of fluoride in groundwater. The study is based at the areas around Mount Meru in Northern Tanzania. The volcanic sediments around this mountain had been segregated by geological studies into various lithologies. In this study water and soil samples were collected at springs in volcanic sediments categorized as main cone group, mantling ash, Tengeru lahar, Ongadongishu lahar and Ngarenanyuki lahar. Fluoride levels in water were then correlated to elemental composition of the soil. Water samples showed that fluoride was low in the main cone group, mantling ash and Tengeru lahar whereby the median concentration was 1mg/l but it was high in Ngarenanyuki and Ongadongishu lahars whereby the median concentrations were 4mg/l and 9mg/l respectively. Soil analyses indicated that high levels of aluminium do coincide along with low sodium levels, and vice versa. In addition high levels of sodium in soil are accompanied by high levels of calcium. Correlation studies indicated a strong negative relationship between aluminium in soil and fluoride in spring water with r2 = 0.847. On the other hand, a positive correlation was obtained between calcium in soil and fluoride in water with correlation coefficient, r2= 0.765. Likewise, sodium indicated a positive correlation with fluoride in water (r2= 0.458). So long as high levels of Na and Ca in soil or water normally result to formation of salts on the banks of water sources after prolonged evaporation during dry seasons, the correlation established between fluoride and such elements in soil can enable people within volcanic areas to identify water sources with unacceptable levels of fluoride in their areas hence reducing the risks of fluorosis.
Revocatus Lazaro Machunda,
Alfred Nzibavuga Nyarubakula Muzuka,
Application of Soil Composition for Inferring Fluoride Variability in Volcanic Areas of Mt. Meru, Tanzania, International Journal of Environmental Monitoring and Analysis.
Vol. 2, No. 5,
2014, pp. 231-238.
L. H. Weinstein and A. Davison, Fluorides in the environment: effects on plants and animals: CABI, 2004.
J. M. Ten Cate and J. D. B. Featherstone, "Mechanistic aspects of the interactions between fluoride and dental enamel," Critical Reviews in Oral Biology & Medicine, vol. 2, no. 3. pp.283-296, 1991.
J. D. Featherstone, "The science and practice of caries prevention," Journal-American Dental Association, vol. 131, no. 7. pp.887-900, 2000.
World Health Organization, Fluorine and fluorides: World Health Organization, 1984.
M. E. Kaseva, "Contribution of trona (magadi) into excessive fluorosis-a case study in Maji ya Chai ward, northern Tanzania," Science of the Total Environment, vol. 366, no. 1. pp.92-100, 2006.
A. Hardisson, M. I. Rodriguez, A. Burgos et al., "Fluoride," Encyclopedia of food sciences and nutrition, 2nd edn.Elsevier Science, London. pp.2555-2559, 2003.
D. V. Reddy, P. Nagabhushanam, B. S. Sukhija et al., "Fluoride dynamics in the granitic aquifer of the Wailapally watershed, Nalgonda District, India," Chemical Geology, vol. 269, no. 3. pp.278-289, 2010.
J. T. Nanyaro, U. Aswathanarayana, J. S. Mungure et al., "A geochemical model for the abnormal fluoride concentrations in waters in parts of northern Tanzania," Journal of African Earth Sciences (1983), vol. 2, no. 2. pp.129-140, 1984.
M. Amini, K. Mueller, K. C. Abbaspour et al., "Statistical modeling of global geogenic fluoride contamination in groundwaters," Environmental science & technology, vol. 42, no. 10. pp.3662-3668, 2008.
M. I. Letnic and B. J. Fox, "The impact of industrial fluoride fallout on faunal succession following sand mining of dry sclerophyll forest at Tomago, NSW - I. Lizard recolonisation," Biological Conservation, vol. 80, no. 1. pp.63-81, 1997.
M. Ando, M. Tadano, S. Yamamoto et al., "Health effects of fluoride pollution caused by coal burning," Science of the Total Environment, vol. 271, no. 1. pp.107-116, 2001.
S. Gupta, D. Mondal, and A. Bardhan, "Geochemical provenance and spatial distribution of fluoride in Groundwater in parts of Raniganj coal field, West Bengal, India," Archives of Applied Science Research, vol. 4, no. 1. pp.292-306, 2012.
N. J. Barrow and A. S. Ellis, "Testing a mechanistic model. III. The effects of pH on fluoride retention by a soil," Journal of soil science, vol. 37, no. 2. pp.287-293, 1986.
P. J. Jackson, P. W. Harvey, and W. F. Young, "Chemistry and bioavailability aspects of fluoride in drinking water," Marlow, Buckinghamshire: WRc-NSF, 2002.
J. K. Gikunju, "Fluoride in water and fish from Kenyan rift valley lakes,", University of Nairobi, 1990.
C. J. Bardecki, "Fluoride probability in Tanzania waters," Maji Review, vol. 1. pp.55-61, 1974.
F. J. Gumbo and G. Mkongo, "Water defluoridation for rural fluoride affected communities in Tanzania," Ngurdoto, Tanzania October 18-21, 1995. pp.109, 1995.
URT, "The United Republic of Tanzania. Strategy for Scaling up Defluoridation Activities and Piloting Research Findings. Ministry of Water." . 2013.
G. Ghiglieri, D. Pittalis, G. Cerri et al., "Hydrogeology and hydrogeochemistry of an alkaline volcanic area: The NE Mt. Meru slope (East African Rift-Northern Tanzania)," Hydrology and Earth System Sciences, vol. 16, no. 2. pp.529-541, 2012.
P. Wilkinson, C. Downie, P. J. Cattermole et al., " Arusha. Geological Survey of Tanzania, Quarter Degree Sheet 143. " . 1983.
F. Mashingia, F. Mtalo, and M. Bruen, "Validation of remotely sensed rainfall over major climatic regions in Northeast Tanzania," Physics and Chemistry of the Earth, Parts A/B/C, 2013.
L. K. Munishi and P. C. Sawere, "Climate change and decline in water resources in Kikuletwa Catchment, Pangani, Northern Tanzania," African Journal of Environmental Science and Technology, vol. 8, no. 1. pp.58-65, 2014.
G. Ghiglieri, R. Balia, G. Oggiano et al., "Prospecting for safe (low fluoride) groundwater in the Eastern African Rift: the Arumeru District (Northern Tanzania)," Hydrology and Earth System Sciences Discussions, vol. 14, no. 6. pp.1081-1091, 2010.
S. J. Cronin, V. E. Neall, J. A. Lecointre et al., "Environmental hazards of fluoride in volcanic ash: a case study from Ruapehu volcano, New Zealand," Journal of Volcanology and Geothermal Research, vol. 121, no. 3. pp.271-291, 2003.
V. Saxena and S. Ahmed, "Dissolution of fluoride in groundwater: a water-rock interaction study," Environmental geology, vol. 40, no. 9. pp.1084-1087, 2001.