[Default] On Mon, 10 Jun 2013 09:16:41 -0400,"Crispin Pemberton-Pigott" <[email protected]> wrote:
> >Don't deep mined coals have elevated concentrations of everything? Hardly, they are likely over 90% carbon, depending on how hot they have been cooked. The thing is that many of the heavy metal salts are not very soluble, so when the coal was formed in a wet environment then super heated the superheated water was able to dissolve them, as it then flashed off as steam the heavy metals were deposited in the coal seam. Interestingly I just read today that the fungi that can attack lignin hadn't evolved at the time the plant precursors to coal existed, so now it is unlikely coal would be formed from plant residues. > >As to what comes out in a fire I leave that to Prof Lodoysamba who watches >the elements floating around Ulaanbaatar better than anyone. Some metals can >be evaporated and some cannot. Yes and it is the conditions in the fire that determine whether it is oxides, carbonates or other species of heavy metal derivatives are formed. Presumably it's their volatility in the fire which determines if they end up as a solid ash or a vapour. >He expressed a concern about the sudden and >quite dramatic increase in cadmium this past winter for the first time, the >root cause of which is still unknown. There is a lot of salt in the air. Do you mean common salt? It doesn't look like one could get much further from a sea. AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
