Surface Activity of Humic Substances within Peat Profile
Humic substances are able to reduce the surface tension of their solutions and thus can act as surfaceactive substances in natural environment and possibly also for industrial applications.The ability to influence the surface tension of humic substance solutions depends on their origin.The objective of this study is a comparison of the ability of humic substances from peat profile to influence the surface tension of their solutions and identification of the structural characteristics of peat humic acids,determining their surfactant properties.Humic acids isolated from peat demonstrated significant impact of the surface tension of their solutions-they act as weak surfactants.The surface tension of humic acid solutions decreased with increasing concentration,and it depends on the solution pH.The ability to influence the surface tension of peat humic acids isolated from a well-characterized bog profile demonstrates dependence on age and humification degree.With increase of the humification degree and age of humic acids,their molecular complexity and ability to influence surface tension decreases; even so,the impact of the biological precursor (peat-forming bryophytes and plants) can be identified.
Surface tension Humic substances Humification degree Peat
Oskars Purmalis Maris Klavins
Department of Environmental Sciences,University of Latvia,Raina Blvd.19,LV 1586,Riga,Latvia
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
190-192
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）