Dioxins have been repeatedly detected in clays from Europe and USA since 1996, with contamination of clay assumed to be the result of ancient forest fires or similar natural events with concentration of the PCDD/F during clay sedimentation.
Dioxins have been repeatedly detected in clays from Europe and USA since 1996. This was with contamination of clay. This clay is assumed to be the result of ancient forest fires during clay sedimentation. This clay is assumed to be similar natural events with concentration of the PCDD/F during clay sedimentation.