Engineering360: "Polymer prepared to enhance uranium extraction from seawater"

I'd be interested in the documentation for the claim that the oceans contain 1000 times the uranium as all the land masses. I have known about the presence of uranium in ocean water for many years, and applaud this research as a possible way to extract it. This approach probably reduces the health hazards associated with conventional mining, but makes it (in its native or unenriched isotope composition) much more available to various nations.

If the documentation for the claim is based on recent and limited water samples, the actual concentration may be skewed to falsely high readings because of the substantial usage of DU (depleted uranium) in weapons--probably thousands of tons used this way in the last 15 years. That possibility of falsely high readings can be easily checked by analysis of the isotope ratios in the samples taken and comparing them to the ratios for mined ore.