**Utilizing Radioisotopes for Trace Metal Speciation Measurements in Seawater**

Croot, P.L.1,2, Heller, M.I.1, Schlosser C.1 and Wuttig, K.1 *1FB2: Marine Biogeochemistry, IFM-GEOMAR, Kiel, 2Plymouth Marine Laboratory, Plymouth, 1Germany 2United Kingdom* 
