Concentration is the key. The flyash I was around did get concentrated heavy metals mostly because of DEQ and EPA regulations dictated we recycle and reburn the flyash several times for air quality reasons. The only thing was, we emitted none of the heavy metals anyway because of an extensive filter bag system that captured the ash. In its supreme reasoning, each government regulatory body seemed to be in competition with the other to make life more miserable for power producers (and our production was for internal use not for public consumption). So we had to install very expensive redundant equipment just to satisfy a few bureaucrats sitting in offices a thousand miles away with no clue how a coal fired power plant works.
Too political? Sorry, go ahead and edit my rant ... even if all this happened fifteen years ago. I can only imagine how much worse it is now.
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