| Summary: | The proximate composition and the iron uptake from an iron-rich resin of first year leachates showed variations with species, season and dilution, while these properties of leaf extracts varied only with species. Extracts took up considerably more iron than leachates. The mechanism of iron uptake was investigated by reaction with dipyridyl, potentiometric and conductometric titrations, and electrophoresis on filter paper. These investigations indicated that the ferric iron taken up was converted, by both leachates and extracts, largely into an anionic ferrous complex stable to oxidation by air or by oxygen, and to high alkalinity.
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