There's mercury in high-fructose corn syrup too

Reuters - Studies find mercury in much US corn syrup

One study took 20 samples of straight high-fructose corn syrup (HFCS) and tested for mercury, finding detectable levels in 9. Another study took food off the shelves at the supermarket and tested 55 different samples where HFCS was the 1st or 2nd ingredient on the label. About 1/3 had detectable mercury. The theory is that HFCS gets contaminated when it is processed at the industrial level. Food processing companies and corn growers contest the methodology of the study.