Transferts réactifs et mobilité de la matière organique dissoute dans les sols

TL;DRAbstract

DOM is present in all soils, waters and organic wastes and can be important in binding and co-transporting metals and organic polluants, there fore endangering the quality of potable waters. Dom is higly variable over space and time, which complicates its characterization. A new approach to DOM, a bottom-up approach is presented that concentrates on the molecular composition of DOM. By the means of a thorough literature research, the importance of simple individual compounds in environmental processes is demonstrated. Dialysis of DOM from different sources revealed a great variability of DOM samples in respect of molecular composition and size. Eighty, 70, 50 and 40% of the total organic carbon (TOC) was found in the fractions with low molecular weight in vinasse, leaf compost, soil and chicken manure, respectively. More than 40% of the TOC in vinasse and leaf compost belonged to the fraction with a molecular weight <500 Da, revealing the abundance of small weight in vinasse, suggestin

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