Thermal analyses (TG-DTA), elemental composition and isotope analyses (13C and 15N) were performed on humic acids (HA) from peats (P), leonardites (Le) and lignites (L), in order to investigate their structure and the changes taking place during the humification process. Thermal analyses showed structural differences between HA samples in relation to their coalification rank. In particular the lignite HA were characterized by a more stable chemical composition at high temperatures. The delta 13C and delta 15N values can provide information on the biogeochemical processes involved in HA formation. In particular, peat HA were linked to anoxic environments that enable plant residues to persist in their structure. In contrast, leonardite and lignite HA formation seems to be governed by different biogeochemical processes from those responsible for peat diagenesis. However, the isotopic analyses did not provide any distinction between leonardite and lignite HA. On the basis of the data presented in this study, it may be concluded that TG-DTA and isotope ratio measurements are powerful tools for investigating the formation pathway of humic substances from
FRANCIOSO O., MONTECCHIO D., GIOACCHINI P., CIAVATTA C. (2005). Thermal analysis (TG-DTA) and isotopic characterization (13C and 15N) of humic acids from different origins. Applied Geochemistry. APPLIED GEOCHEMISTRY, 20/3, 537-544.
Thermal analysis (TG-DTA) and isotopic characterization (13C and 15N) of humic acids from different origins. Applied Geochemistry
FRANCIOSO, ORNELLA;MONTECCHIO, DANIELA;GIOACCHINI, PAOLA;CIAVATTA, CLAUDIO
2005
Abstract
Thermal analyses (TG-DTA), elemental composition and isotope analyses (13C and 15N) were performed on humic acids (HA) from peats (P), leonardites (Le) and lignites (L), in order to investigate their structure and the changes taking place during the humification process. Thermal analyses showed structural differences between HA samples in relation to their coalification rank. In particular the lignite HA were characterized by a more stable chemical composition at high temperatures. The delta 13C and delta 15N values can provide information on the biogeochemical processes involved in HA formation. In particular, peat HA were linked to anoxic environments that enable plant residues to persist in their structure. In contrast, leonardite and lignite HA formation seems to be governed by different biogeochemical processes from those responsible for peat diagenesis. However, the isotopic analyses did not provide any distinction between leonardite and lignite HA. On the basis of the data presented in this study, it may be concluded that TG-DTA and isotope ratio measurements are powerful tools for investigating the formation pathway of humic substances fromI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.