Environmental Context. Town and Leeuwen’s paper (Environ. Chem. 2005, 2, 80) challenges interpretations of the role of organic matter binding iron in the ocean. This challenge is based on the theory behind a commonly used electrochemical technique, CLE-AdSV. Consistent experimental measurements for iron and other metals and the use of other techniques suggests that their interpretation of iron(III) being non-bioavailable is incorrect and, rather, the use of CLE-AdSV needs to be modified.