Elham A. Ghabbour

Isolation of humic acid from the brown algaPilayella littoralis

A standard humic acid extraction procedure has been used to isolate dark brown organic residues from samples of the macroscopic marine brown algaPilayella littoralis. The residues are insoluble in water, but soluble at high pH, and are similar in elemental composition, ash content, UV-visible, IR, PMR and X-Ray fluorescence spectra, X-Ray diffractograms and scanning electron micrographs to residues of a humic acid isolated from municipal compost. These results indicate thatPilayella produces humic acids.

18:The stability of humic acids in alkaline media

Humic materials play an important role in nature and therefore they are intensively studied. Recently, it was confirmed that humic substances represent a complex mixture of many compounds of rather low molecular weight [1-6]. Humic materials have been found to be complex, negatively charged polymers, containing many various functionalities associated into the aliphatic aromatic backbone structure [7]. This can explain the presence of both hydrophilic and hydrophobic sites in their structure.

17:Are there humic acids in antarctica?

Soil is the earths thin coat. It is reservoir of water andnnutrients and is a participant in the cycling of carbon andnother elements through the global ecosystem. Soil formationnprocesses are influenced by several factors as topography,nclimate, organisms, time, etc. Humic substances (HSs) andnparticularly humic acids (HAs) represent major part of organicnmatter in soil. HSs are wide spread and can be found in soilsnof all continents.

Humic Acids are Versatile Natural Polymers

Life depends on exquisitely designed enzymes, nucleic acids, polysaccharides and structural proteins. These materials return to the earth, where they are humified to make organic polymers called humic substances. These living polymers interact with air, earth and water and have many environmental functions. Natural humification makes efficient use of life’s waste.

23:Models and theories

An agricultural muck soil from Orange County,NY was extracted with hot water in a Soxhlet Models andTheories An agricultural muck soil from Orange County,NY was extracted with hot water in a Soxhlet

5:History, philosophy and spectroscopy

An agricultural muck soil from Orange County, NY was extracted with hot water in a Soxhlet system to produce several kilograms of lyophilized organic matter. After concentration, electrodialysis and ultrafiltration, a low-charged polysaccharide was isolated using convection as well as continuous flo...