- Dec 6, 2006
Benzene became a concern in gasoline relatively recentlyCalum,
The difference is that benzene is just carbon and hydrogen, so it's not dangerous after combustion and degradation. Tetra-ethyl lead contains, well, lead, and you can't get rid of it.
Once the TEL goes through combustion, the lead is carried into the atmosphere by by the hot exhaust gasses and can be inhaled; it also ends up in soil and water where it can be directly ingested or take up by plants and then concentrated as it passes up the food chain.
So the difference is danger to people handling it vs. widespread environmental contamination no matter what. A gross simplification, but a good starting point.
Reducing benzene â€¨in gasoline
Cost-effective solutions for the reduction of benzene in gasoline, particularly with regard to MSAT II requirement