Coal ash is known to contain dangerous elements including arsenic, lead, and selenium, yet the TVA refused at first to issue any health warnings about contamination from the spill.
Coal ash contains toxic heavy metals, including arsenic, cadmium, mercury and lead, which leach into water systems and get blown into the air during windy days.
煤灰含有有毒的重金属，包括砷、镉、水银和铅，这些会从供水系统中过滤处理，在有风的时候吹到空中。
3
Small porous bowl made of bone ash used in assaying to separate precious metals from e. g. lead.