The presence of trace elements in gasoline can lead to a number of detrimental effects both on the automobile engine using the fuel as well as the environment. The analysis of trace elements is therefore essential to ensure the performance of the engine is not affected by the fuel and that environmental damage does not occur when trace elements are transported from the engine to the environment via emissions. A common example is lead, which will not only affect the performance of an engine by poisoning the catalytic converter but will also be transported to the environment via exhaust emissions. Once in the environment, lead can enter the food chain of many animals via different pathways (soil, water, plants etc.) and bio-accumulate, causing adverse effects or even death, due to its toxicity.