Analysis rain acidity in humid savannah of Lamto (Côte d'Ivoire) from 1995 to 2011
This study was initiated with the aim of analyzing the acidity of rainfall in the humid savannah region of Lamto in a context of rainfall variability. With this in mind, our analysis was based on rainfall data supplied by SODEXAM and 1441 rainwater samples collected between 1 January 1995 and 31 December 2011 as part of the INDAAF network. The results show that about 85% of the rainwater collected is acidic. This proportion depends very little on the number of rainy days in a year. In addition, it can be seen that years with low rainfall have rainwater that is more acidic than years with high rainfall. The mean pH of rainfall over our study period was 5.2. Seasonally, rainwater is more acidic in the dry season than in the wet season. This study also showed a trend towards a very slight decrease in the average pH of rainfall over the study period, indicating a slight acidification of the atmosphere in the Lamto region over the years, although a return of rain was observed at the end of our study period.