Premium
Forms of soluble aluminium in acidic topsoils estimated by ion chromatography and 8‐hydroxyquinoline and their correlation with growth of subterranean clover
Author(s) -
WHITTEN M G.,
RITCHIE G. S. P.,
WILLETT I. R.
Publication year - 1992
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.1365-2389.1992.tb00136.x
Subject(s) - chemistry , citric acid , ion chromatography , oxalic acid , aluminium , nuclear chemistry , soil water , inorganic chemistry , chromatography , biochemistry , organic chemistry , geology , soil science
SUMMARY Labile Al in the soil solution measured by 8‐hydroxyquinoline (Al HQ ) was a better predictor of plant growth than trivalent Al (Al IC 3+ ) measured by ion chromatography (IC). HQ reacted with some organic Al complexes which did not separate during chromatography. In the presence of oxalic acid, Al HQ was greater than Al IC 3+ , which was the same as the greater than Al 3+ (Al 3+ Calc ), whereas in the presence of citric acid, Al HQ was greater than Al IC 3+ , and both were greater than Al +3 Calc , In extracts of soils that had been acidified, Al 3+ IC was less than Al HQ , which was similar to Al 3+ Calc , when it was assumed that the only complexing ligands were OH − and F − . The proportion of Al 3+ IC in the soil solutions decreased more than Al HQ as the pH increased. Organic ligands appeared to form complexes with Al at the expense of AIF complexes. Forms of Al detected by IC differed in CaCl 2 extracts and soil solutions. Al HQ in the CaCl 2 extracts and soil solution were closely correlated, although the proportion of Al HQ was higher in the CaCl 2 extracts. And soil solutions. Al HQ in the CaCl 2 extracts and soil solution were closely correlated, although the proportion of Al HQ was higher in the CaCl 2 extracts.