Dear Tom
Thanks for that: http://www.bacatec.de/dl/Ge09_Glaser-Steiner_engl.pdf "A further criterion for the quality of biochar is the lack of contamination with both inorganic (e.g. heavy metals) and organic contaminants (e.g. polycyclic aromatic hydrocarbons (PAH), dioxins etc.). In this study, we could only evaluate polycyclic aromatic hydrocarbons (PAH, Fig. 4). Although chars from wood gasification are within the elemental composition and the black carbon thresholds, they exhibit extremely high PAH contents (Fig. 4). Therefore, they are not suited for soil amendment and thus, they cannot be classified as biochar. Surprisingly high PAH contents were also measured in the barbeque charcoals (Fig. 4) while all other investigated chars had low PAH contents (Fig. 4)." Well, there's a kick in the head. Why not? Because of chemicals manufactured in the process that were not there in the original fuel. That may explain a lot to some experimenters. Regards Crispin
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