Geochemistry, origin and recharge mechanisms of groundwaters from the Garoua Sandstone aquifer, northen Cameroon

Variation in stable isotope ratios of monthly rainfall in the Douala and Yaounde cities, Cameroon: local meteoric lines and relationship to regional precipitation cycle

“…7b) in the semi-arid region suggests the dominance of evapotranspiration over rainfall. Evapotranspiration doubles the mean annual precipitation as reported by Njitchoua et al (1997) in Garoua, which is along this segment.…”

Use of Hydrochemistry and Stable Isotopes as Tools for Groundwater Evolution and Contamination Investigations

“…The increase in pH is explained by the consumption of dissolved CO 2 gas by organisms and aquatic plants (Njitchoua et al, 1997) whereas the decrease of this parameter is primarily due to oxidation of organic matter and also due to human induced pollution ( According to TDS classification 84% of the samples belonged to brackish type (TDS > 1000 mg/l) and the remaining 14% represented fresh water (TDS < 1000 mg/l). The electrical conductivity values range from 763.0 to 5,376 µs/cm at 25 o C, averaging 2336 µs/cm.…”

δ18O and δD variations in some volcanic lakes on the Cameroon Volcanic Line (West-Africa): generating isotopic baseline data for volcano monitoring and surveillance in Cameroon

“…Consequently, this study attempts to establish a more representative CMWL for Cameroon by using data that covers more territory. Accordingly, in addition to the data obtained in this work, we incorporated literature data (Fontes and Olivry, 1976;Njitchoua et al, 1995;Njitchoua and Ngounou Ngatcha, 1997;Gonfiantini et al, 2001;Ako et al, 2009;Ako, 2011;Garcin et al, 2012). Because the areas are climatologically similar, the weighted averages of the isotopic ratios from Ndjamena in Chad (IAEA, 2007) and data from Mbonu and Travir (1994) in the Joss Plateau of Nigeria were used to supplement the limited data from the northern semi-arid region and the Adamaua Plateau (where we had only 2 samples), respectively.…”