Health risks of the chemicals in drinking water in the city of Fez: Nitrate and nitrite ions [Risques sanitaires liés aux composés chimiques contenus dans l'eau de boisson dans la ville de Fès: Cas des ions nitrates et nitrites]

Most chemical pollutants are harmful to health and can cause various health complications such as irritation,allergies,cancer and chemical poisoning. this work is part of the health surveillance of water intended for human consumption produced by the hygiene services of the ministry of health under the rules in force in particular law 10-95. this is a retrospective study,covering the period between january and december of 2012 and 2013,distributed in six districts of the city of fez. two examples of chemical quality monitoring are discussed in this article: the case of nitrates and nitrites regulated morocco with a quality limit set respectively at 50 mg/l and 0.1 mg/l. the drinking water samples were collected by environmental health technicians through appropriate vials,stored and transported in a cooler at the regional diagnostic laboratory epidemiological and environmental hygiene fez (rdleehf) for analysis. for a total of 341 samples,the determination of nitrite and nitrate by spectrophotometry were performed according to the standards in force. to ensure the reliability of results,rdleehf adopt control procedures (internal and external) quality according to the requirements of the international standard iso / iec 17025. physicochemical results found in this study showed that the determination of nitrite and nitrate respectively recorded concentrations of 0.001 mg/l to 0.09 mg/l and 4.4 mg/l to 9.04 mg/l. the values found for the parameters analyzed are consistent with the standard 03.7.001 moroccan and international standards of who. these results for the studied parameters must reassure local authorities and inhabitants of the city of fes good chemical quality of the water provided against the health risks associated with situations that the limits and references drink quality of water intended for human consumption.