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The potentiometric measurement of stability constants of soil polycar boxy late‐Cu 2+ chelates
Author(s) -
YOUNG S. D.,
BACHE B. W.,
LINEMAN D. J.
Publication year - 1982
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1982.tb01781.x
Subject(s) - potentiometric titration , copper , chemistry , chelation , stability constants of complexes , ligand (biochemistry) , analytical chemistry (journal) , polymer , inorganic chemistry , metal , electrode , ion , chromatography , organic chemistry , biochemistry , receptor
Summary Stability constants describing Cu 2+ combination with three natural and one synthetic polycarboxylates were calculated from pH measurements alone, and using a Cu 2+ ion selective electrode. Good agreement between the two methods justified the theory for polymer‐cation association. The results were consistent with the formation of a single complex CuL 2 over a fairly wide range of metal‐ligand (L) ratios. The stability constant (β H Cu ) that was independent of polymer charge allowed the prediction of copper speciation in soil solution as a function of pH and soluble organic matter.