Investigation of Chemical Structure of Natural Organic Matters from Dried Figs

摘要

Humic substances(HS)are polyelectrolytes produced by the abiotic alteration of plant and animal tissue during the early decomposition of natural organic matter and are found in the soils,sediments,and surface waters on the earth(1).They are important components of soil refractory organic matter and play critical roles in sediment processes such as metal reduction and pollutant transport.Recently,Hatano has found that decomposing plant tissues,dried figs contains novel colored materials,P and B samples(2).They were revealed not to adsorb a column of CM-Sephadex under any condition,while they strongly adsorbed a DEAE-Sephadex.column.This indicates that these samples have a lot of strong negative charges,which is a representative characteristic of HS.It is worth noting that the UV-vis absorption and IR spectra of the P and B samples resemble those of HS(2),indicative of a kind of HS(2).