Punjab Agricultural University, Ludhiana, 141004, Punjab
*Present address: Department of Soil Science and Agricultural Chemistry, Rajendra Agricultural University, Pusa 848125, Samastipur, Bihar
Molecularly homogeneous fractions of fulvic acid extracted from a Mollisol were obtained by gel permeation chromatography. These were charaterized by elemental and functional group analysis and UV and IR spectroscopy. The molecular weights of fulvic acids ranged between 509 and 6918. The presence of carboxyl, phenolic hydroxyl, alcoholic hydroxyl,ketonic carbonyl and amine groups was observed. The IR spectra of metal complexes of the fulvic acids indicated that both electrovalent and coordinate covalent bonds are involved in complex formations.
IR and UV spectroscopy, fulvic acid, metal complexes
