CONSIDERABLEinterest attaches to the heavy metals present in small amounts in sea water. Of these, iron is particularly important, for there is little doubt but that it may be a limiting factor in the growth of certain organisms. Thompson, Bremner, and Jamieson (g) reviewed the literature -on this subject and proposed a method for the determination of total iron in the water.Any study of the availability of iron must involve its separation into the several possible forms of comtynation. Thompson and Bremner later (1) modified their method and determined both "soluble'' and "total" iron in a number of samples of water. The present paper describes an attempt to determine the concentration of "free dissolved ferrous and ferric ions-," and since a somewhat different method of analysis is used the results are not strictly comparable with those of Thompson and Bremner, who evaporated filtered samples with sulfuric acid to eliminate interfering substances such as fluoride and organic matter, and then determined iron eolorimetrically with thiocyanate, extracting the color with isoamyl alcohol.

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