tetraetyllead

Tetraethyllead, often abbreviated as TEL, is an organometallic compound with the chemical formula Pb(C2H5)4. It is a colorless liquid with a faint odor. Historically, its primary application was as an additive to gasoline to increase its octane rating, thereby preventing engine knocking and allowing for higher compression ratios. This use began in the 1920s and continued for several decades in many parts of the world.

The addition of TEL to gasoline was a significant development in internal combustion engine technology, enabling the production of more powerful and efficient engines. However, concerns about its toxicity and environmental impact grew over time. Lead compounds, including tetraethyllead, are known neurotoxins and can accumulate in the environment. The combustion of leaded gasoline released lead into the atmosphere, leading to widespread contamination of soil, water, and air.

In response to these environmental and health concerns, many countries began phasing out leaded gasoline. Regulations and the development of unleaded fuel alternatives led to a dramatic decline in the production and use of tetraethyllead. Today, its use as a gasoline additive is largely prohibited globally, with the exception of a few remaining applications in aviation gasoline and some specific industrial processes. The legacy of leaded gasoline continues to be addressed through environmental remediation efforts.