Analysis of the Physicochemical and Microbiological Parameters of the Water of the Amparihibe Lake Located in the District of Nosy-Be

摘要

Lake Amparihibe is a large lake among the 12 sacred lakes that exist in the district of Nosy-Be, Its exploitation by the JIRAMA for addiction in drinking water for the population of Nosy-Be, to begin in 1975. The purpose of this work to know the concentrations of each physical, chemical, microbiological parameters and quality control of this water. The results of water analysis of Lake Amparihibe in Nosy-Be district are given in the following line. For the physical parameters: the temperature is 21.8°C, the turbidity is 1.70 NTU, the pH is 7.97, the conductivity is 218 μS/cm. So these results show that the conditions required for drinking water are verified. For chemical parameters: organic matter 9.24 mg/L, salinity is 0, TAC is 10.98°F, total hardness is 132.73 mg/L, nitrates is 0.36 mg/L, ammonium is 0.48 mg/L, Sodium is 18.36 mg/L, Potassium is 10.39 mg/L, Calcium is 24.23 mg/L, Magnesium is 17.55 mg/L, Aluminum is 0 copper is 0.068 mg/L, Lead is 0, and chloride is 149.5 mg/L. The concentration of organic matter is in excess of the limit value for drinking water, the total hardness times 2.5 for the limit value required for drinking water that is to say water is too much to say, the remainders meet the standards required for water intended for human consumption. For microbiological parameters: microorganism at 22°C is 120 Ufc/mL, microorganism at 36°C is 25Ufc/mL, coliform bacteria is 1Ufc/100mL, Escherichia coli 1Ufc/100mL, Intestinal Enterococci is 0.05 Ufc/100mL and Spores of microorganisms is 0.5mg/L. the results show that the water is microbial. Disinfection by sodium hypochlorite is used to treat it's water before it is used.