Lead Isotope Tracing Of Major Sources Of Lead Pollution In The Atmosphere Of Chengdu City

Lead isotope tracing of major sources of lead pollution in the atmosphere of Chengdu cityThe mass of lead isotope is heavy and the deference of mass number is small. The factors of environment hardly change the composition of lead isotope, for example temperature, stress, Ph, Eh and so on. Based on the geochemical characteristics of lead isotope, the theory base of lead isotope for environmental pollution tracing is analyzed. After measuring and comparing the deference of composition of lead isotope in gasoline, diesel oil and coal, we discover the characteristic that the content of radiogenic lead in gasoline and diesel oil is lower than that in coal and the value of 207Pb/206Pb of gasoline and diesel oil are higher than coal's in Chengdu, Sichuan. The characteristic of lead isotopic composition is used as a indicator to tracing the source of lead pollution on the atmosphere in Chengdu. We conclude that lead in atmosphere mostly originate from the exhaust of automobile. In addition, we discover a sort of experimental method on measuring the ratio of lead isotope in floating dust by a lot of experiment.