Abstract
Results of a preliminary study of filterable size fractions of iron, in four rivers in the South West of England, indicate that a significant proportion (6 to 53% w/w) of sub‐micron material may be recovered in a non‐dialyzable, macromolecular form (>10,000 molecular weight) using ultrafiltration. Mössbauer measurements of fulvic acid peat extracts and a molecular weight fraction (500 molecular weight) of iron, recovered from moorland drainage, demonstrate that a wide range of molecular environments are occupied by an iron nucleus in these macromolecules.

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