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Diffusion of Iron and Iron Chelates in Soil
Author(s) -
O'Connor G. A.,
Lindsay W. L.,
Olsen S. R.
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500030024x
Subject(s) - diffusion , sorghum , aqueous solution , analytical chemistry (journal) , chemistry , chelation , diffusive gradients in thin films , materials science , nuclear chemistry , inorganic chemistry , environmental chemistry , thermodynamics , physics , metal , agronomy , biology , organic chemistry
The importance of diffusion in moving Fe to plant roots was estimated by theoretical calculations. In plant studies chelates increased the diffusion and uptake of Fe by increasing the concentration gradient of diffusible Fe to sorghum roots ( Sorghum vulgare ). Uptake of Fe increased linearly with the concentration of Fe in solution. Self‐diffusion coefficients of Fe and Fe chelates were determined in both aqueous media and soil. In aqueous media, the diffusion coefficients were 6.2 × 10 ‐6 cm 2 sec ‐1 for Fe, 5.4 × 10 ‐6 cm 2 sec ‐1 for FeEDDHA, 4.2 × 10 ‐6 cm 2 sec ‐1 for FeDTPA, and 3.9 × 10 ‐6 cm 2 sec ‐1 for FeEDTA. In soil, a correction factor was used to adjust the apparent porous system self‐diffusion coefficients. The corrected diffusion coefficients in soil were 1.5 × 10 ‐7 cm 2 sec ‐1 for Fe and 1.85 × 10 ‐7 cm 2 sec ‐1 for FeEDDHA.