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SUMMARY Data are presented for samples obtained to extend previous results which indicated that gum arabic from Uganda differed in several respects from typical Sudanese commercial samples. Differences in terms of fine structural features (13C-NMR spectroscopy), amino acid compositions, and high contents of aluminium and iron (but not of chromium and copper) are confirmed. Data for soil samples taken from beneath gum- bearing trees indicate strong preferential uptakes of potassium, calcium and magnesium, and that there is a relationship between the acid-leachable amounts of aluminium, barium, chromium, copper, iron, lead, titanium and zinc in a soil and their content in the gum produced by the tree growing thereon.
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D.M.W. Anderson (1992) studied this question.
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