BevNET.com: Study finds mercury in HFCS, findings questioned
So, it looks like mercury is in many forms of HFCS found in common household foods. While the objective levels are pretty small it could be a significant source of mercury that was unknown. Considering how harmful even small quantities of mercury are to kids, this could be something the FDA will look in to in the near future.
Another reason not to eat products with HFCS!