Characterization of natural organic matter from four Victorian freshwater systems

摘要: The natural organic matter (NOM) from three streams (Redwater Creek, Slip Myrtle Creek) and one small lake (the Inkpot) in Victoria, Australia, was fractionated by a simplified version of Leenheer's method which the NOM is separated into two fractions-hydrophobic acid (HFo-A) compounds total hydrophilic (HE-T) compounds-on basis association with XAD-8 resin. Subsequently, HFo-A fraction further humic fulvic fractions. One sample also six different fractions full Leenheer scheme. Considerable variation found ratio substances (or fraction) to nonhumic HFi-T between four samples, ratios ranging high 77:23% for Inkpot low 20:80% Creek. Samples higher concentrations had percentages substances. major differences proportions observed Creek (20:80%) (52:48%) support hypothesis that residence time water catchment (or, more specifically, contact this sediments, soil, vegetation microbial community) may control concentration nature aquatic NOM. Within HFo-A, or fraction, acids fairly constant each samples investigated, being dominated (>80%) acids.