keywords: Characterization, dissolved organic matter, FTIR, GC-MS, wetlands
The molecular composition of dissolved organic matter (DOM), collected from Baturiya, Nguru, Matara-Uku, Jebba and Lokoja wetlands of the Northern Nigeria were characterized using Fourier Transform Infra–Red (FTIR) and Gas Chromatography-Mass Spectrometry (GC-MS). FTIR results indicated that the DOM of these wetlands contain the phenolic hydroxyl groups, hydroxyl group, conjugated double bond of aromatic family (C=C), amino, amide and free carboxyl groups. The major components identified in all DOM samples analyzed using GC-MS were phenol, 2,4-Bis(1,1-dimethylethyl)phenol, 1-Methyl-4-propan-2-ylbenzene, methyl esters, 2-Myristynoyl pantetheine, 2,2,4-Trimethyl-3-carboxyisopropyl, isobutyl ester, 1,1-Bis(dodecyloxy) hexadecane, Stearic acid hydrizide, 3-Trifluoroacetoxytetradecane, Rhodopin, 2-hydroxy-2-octylsebacic acid, alkenes, alcohols, amines and cyclocompounds. The large carbonyl, phenyl hydroxyl and amine functional groups could explain that DOM from these wetlands might have a strong reactive potential with inorganic and organic pollutants. Phenol hydroxyl groups, conjugated double bonds, amino and carboxylic groups have been implicated for the formation of disinfection by-products like trihalomethane and trihaloacetic acids which are carcinogenic.
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