Effects of heat on the alkali extraction of humic substances from peat

References

• Butler , J.H.A and Ladd , J.N. 1969 . Effect of extractant and molecular size on the optical and physical properties of soil humic acids . Aust. J. Soil Res. , 7 : 229
   Google Scholar
• Cegarra , J. , Reverte , L. , Lax , A. and Costa , F. 1974 . Factores que influyen en la extraccion y fraccionamiento de la materia organlca del suelo . Anal. Edafol. Agrobiol. , 33 : 575 – 590 .
   Google Scholar
• Garcia , D. , Cegarra , J. , Bernal , M.P. and Navarro , A. 1993 . Comparative evaluation of methods employing alkali and sodium pyrophosphate to extract humic substances from peat . Commun. Soil Sci. Plant Anal. , 24 (13–14) : 1481 – 1494 .
   Web of Science ®Google Scholar
• Kairy , A.H. and Ziechmann , W. 1989 . Effect of temperature on the fragmentation of humic acids in alkaline solutions . Zeitschrift fur Pflanzenernahrung und Bodenkunde , 152 (4) : 313 – 317 .
   Web of Science ®Google Scholar
• Mathur , S.P. and Farnham , R.S. 1985 . “ Geochemistry of humic substances in natural and cultivated peatlands ” . In Humic Substances in Soil, Sediment and Water , Edited by: Alken , G.R. , Mcknight , D.M. , Wershaw , R.L. and MacCarthy , P. 53 – 85 . New York , NY : Wiley‐Interscience .
   Google Scholar
• Perdue , E.M. 1985 . “ Acidic functional groups of humic substances ” . In Humic Substances in Soil, Sediment and Water , Edited by: Alken , G.R. , McKnight , D.M. , Wershaw , R.L. and MacCarthy , P. 493 – 526 . New York , NY : Wiley‐Interscience .
   Google Scholar
• Schnitzer , M. and Khan , S.U. 1972 . “ Characterization of humic substances by chemical methods ” . In Humic Substances in the Environment , Edited by: McLaren , A.D. 29 – 51 . New Yprk , NY : Marcel Dekker, Inc. .
   Google Scholar
• Swift , R.S. and Posner , A.M. 1971 . Gel chromatography of humic acids . J. Soil Sci. , 2 : 237 – 249 .
   Google Scholar
• Tsutsuki , K. and Kuwatsuka , S. 1984 . Molecular size distribution of humic acids as affected by the ionic strength and the degree of humification . Soil Sci. Plant Nutr. , 30 : 151 – 152 .
   Web of Science ®Google Scholar
• Yamamoto , S. , Honna , T. , Miyata , O. and Takata , H. 1989 . Alteration of humus characteristics on the extraction by heating with alkaline solvent . Bulletin Faculty of Agriculture, Agricultural University , 42 : 1 – 6 .
   Google Scholar
• Yefimov , V.N. and Vasil'kova , M.G. 1970 . Method of extracting humic substances from peat soils . Soviet Soil Sci. , 2 : 335 – 345 .
   Web of Science ®Google Scholar