Oxidative Degradation of Humic Substances from Manila Bay Sediments by Thermochemolysis with Tetramethyl Ammonium Hydroxide (TMAH)


Aurea M Chu, Elma C Llaguno, Robert Helleur, Teofilo Abrajano
Vol 7 No 1 (2004), pp. 10-24

 

Abstract:

 

Tetramethylammonium hydroxide (TMAH) thermochemolysis with GC-MS analysis was used to characterize the organic matter and their humic (HA) and fulvic acid (FA) fractions in the sediments of eastern and western parts of Manila Bay. The TMAH degradation products of the sediment, and the HA and FA samples were correlated with probable precursors to determine the relative contributions of autochthonous and allochthonous inputs. The contribution of allochthonous materials was found to be higher in the FA than in HA fractions. The FAs, in general, produced greater number and the higher yields of lignin-derived compounds. The HAs, on the other hand, were found to be mainly autochthonous in origin based on the number as well as the relative amounts of fatty acids found in their degradation products. The sediments yielded more varied types of TMAH degradation products compared to their respective HA and FA fractions. There was no significant difference observed between the east and west bay sediments with regard to the mix of degradation products from the HA and Fa fractions.

 

Keywords: thermochemolysis, humic substances, oxidative degradation, Manila Bay


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