Détermination des polluants organiques et de certains paramètres physico-chimiques
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R�SUM� Des �chantillons d'eau pr�lev�s le long de la rivi�re Jakara et de ses affluents (rivi�res Getsi, Jakara, Gwagwarwa et Rafin Malam) dans l'�tat de Kano ont �t� analys�s afin de d�terminer leurs param�tres physico-chimiques et la pr�sence de certains polluants organiques. Les param�tres physico-chimiques ont �t� d�termin�s � l'aide des m�thodes standard de l'Agence am�ricaine de sant� publique (APHA), tandis que les polluants organiques ont �t� extraits et analys�s par chromatographie en phase gazeuse coupl�e � la spectrom�trie de masse (GC-MS). Les r�sultats sont les suivants: pH (7,8 - 8,4); temp�rature (31 - 31,1) C; conductivit� (2759-4862) s/cm; turbidit� (21 - 190) mg/l; MTS (0 - 73,5) mg/l; TDS (1 379 - 2 431) mg/l; COT (53,6 - 326,7) mg/l; COD (32 - 57,3) mg/l; DBO (6,3 - 10,6) mg/l; sulfate (44,3 - 83,3) mg/l et nitrate (24,5 - 50,6) mg/l. � l'exception de la temp�rature, du pH et du SO4,2-, les valeurs des autres param�tres d�termin�s sont sup�rieures � la limite admissible fix�e par les normes de l'OMS et de la NESREA. Treize compos�s organiques diff�rents ont �t� d�tect�s � des pourcentages variables dans les quatre stations d'�chantillonnage. Les compos�s organiques d�tect�s dans les �chantillons et leurs fourchettes de pourcentage sont les suivants: acide dod�cano�que (1,76 - 2,31 %); acide t�trad�cano�que (2,06 - 2,33 %); acide palmitique (7,36 - 10,21 %); octad�canoate de m�thyle.
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