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Updated map 2009
In 2009 IGRAC updated the probability map of Fluoride occurrence in Africa with more recent findings. The EAWAG results by Winkel et al. (2008) were included. The results were published in the UNESCO/IHP book Fluoride in Africa groundwater: Occurrence and mitigation.
References:
Vasak SL, Griffioen J, Feenstra L. Fluoride in African groundwater: Occurrence and mitigation. In: Sustainable Groundwater resources in Africa: UNESCO, IHP; 2010:153-168.
Buy the book - full text article is coming
Winkel L, Berg M, Amini M, Hug SJ, Annette Johnson C. Predicting groundwater arsenic contamination in Southeast Asia from surface parameters. Nature Geosci 2008,1:536-542. Download from the EAWAG website, contact person is Lars Osterwalder