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Properties of poultry litter humic acid fractions and their metal-complexes

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Summary

Molecularly homogenous fractions of humic acid extracted from poultry litter were characterized by elemental and functional group analysis, molecular weight determination, U.V. and infrared spectroscopy. The divalent and trivalent metal complexes prepared from different fractions of humic acid were characterized by infrared spectroscopy. The molecular weight of molecularly homogenous fractions of poultry litter humic acid ranged from 2545 to 40219.

High amounts of functional groups in low molecular weight of humic acid fraction has been indicated by infrared spectra and by chemical analysis. The presence of chromophores C=C and C=O and auxochromes C−OH, C−NH were indicated by infrared and U.V. spectra of these humic acid fractions. Stable complex formation of Fe3+, Cu2+, and Zn2+ with −OH, −NH2 and −COOH ligands of humic acid fractions involved electrovalent and coordinate-covalent bonds. Intensity of absorption bands of molecularly homogenous fractions of humic acid in I.R. spectra is differing depending upon the functional groups content of humic acid fractions.

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Author notes

  1. M. K. Sinha (Associate Professor and University Professor and Head)

    Present address: Department of Soil Science Agricultural Chemistry, R.A.U., Bihar, Pusa, 848125, Samastipur, Bihar, India

Authors and Affiliations

  1. Punjab Agricultural University, 141004, Ludhiana, Punjab

    B. Prasad & M. K. Sinha (Associate Professor and University Professor and Head)

Authors
  1. B. Prasad
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  2. M. K. Sinha
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Additional information

Journal paper No. 5. Department of Soil Science, R.A.U., T.C.A., Pusa-Dholi Campus, Dholi-843121, Muzaffarpur, Bihar, India.

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Prasad, B., Sinha, M.K. Properties of poultry litter humic acid fractions and their metal-complexes. Plant Soil 63, 439–448 (1981). https://doi.org/10.1007/BF02370043

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  • DOI: https://doi.org/10.1007/BF02370043

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