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Table 5 Values of pH of a siderophore solution (DFOM) and a mixture of four organic acids: citric, oxalic, tartaric and ketoglutaric acids (Mix) at different concentrations

From: Potential alteration of iron–humate complexes by plant root exudates and microbial siderophores

Extractant Concentration
0.01 M 0.001 M 0.0001 M
DFOM 4.44 4.87 5.39
Mix 1.98 2.68 3.44