Abstract
The reactive iron contents of fresh water samples filtered with membrane and ultrafiltration filters were determined by an isotope dilution method using the solvent extraction of 4, 7-diphenyl-1, 10-phenanthroline(bathophenanthroline)- Fe complex into 3-methyl-1-butanol (isoamyl alcohol). The total iron contents were determined in the same manner after digestion and dissolution with perchloric acid and hydrofluoric acid. Only small amounts of reactive iron were found in water samples collected upstream, at the reservoir and underground. It is noted that almost all iron in these water samples is present as stable forms. Considerable amounts of reactive iron were found in downstream water, especially as surface species on particulates larger than 5μm.
