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, L. E. , Nelson , D. W. and West , D. X. ( 1981 ): The mechanism of copper (II) binding by humic acid: an electron spin resonance study of a copper (II)-humic acid complex and some adducts with nitrogen donors . Soil Sci. Soc. Am. J. 45 , 745
. X. ( 1981 ): The mechanism of copper (II) binding by humic acid: an electron spin resonance study of a copper (II)-humic acid complex and some adducts with nitrogen donors . Soil Sci. Soc. Am. J. 45 , 745 – 749
. Immunopathol. 114 , 209 – 223 . doi: http://dx.doi.org/10.1016/j.vetimm.2006.07.007 Islam , K. M. S. , Schumacher , A. and Gropp , J. ( 2005 ): Humic acid substances in animal