[1] Sekabira K, Origa H, Basamba T A, et al. International Journal of Environment Science and Technology, 2010, 7(4): 435.
[4] Hawa WaBi M, Faruque Ahmed, Hiroaki Ishiga. Environment Geology, 2007, 52: 625.
[5] Stead-Dexter K, Ward N I. Sci. Total. Enviro., 2004, 11: 334.
[6] Brekhovskikh V F, Volkova Z V, Kocharyan A G. Water Research, 2001, 28: 278.
[7] Akcay H, Oguz A, Karapire C. Water Research, 2003, 37: 813.
[11] Burgos P, Madejón M, Pérez-de-Mora A, et al. International Journal of Applied Earth Observation and Geoinformation, 2008, 10: 11.
[12] Nriagu J O, Pacyna J M. Nature, 1988, 333: 134.
[14] Muller G. Geography Journal, 1969, 2(3): 108.