Qualitative source analyzing method for lead exposure source in human blood
A source analysis and blood technology, applied in the field of exposure source analysis and determination, can solve the problems of effective identification of multi-source systems of heavy metals that cannot be deposited, qualitative evaluation of difficult pollution contributions, and large workload, and achieves good operability and practicability. , the effect of small error and simple method
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[0035] There are four stable isotopes of lead in nature, which are 204 Pb, 206 Pb, 207 Pb and 208 Pb, the latter three are 238 U 235 U 232The final product of Th decay, the abundance of these three isotopes (the abundance of isotopes in nature, also known as the natural occurrence ratio, refers to the proportion of this isotope in all natural isotopes of this element, and the abundance is generally expressed in The percentage indicates that the abundance of man-made isotopes is zero. Because various isotopes are often distributed evenly in nature, the calculation of the average value is more accurate, so the atomic weights listed on the periodic table are actually weighted by the abundance of various isotopes mean) increases with time, while 204 Pb has not yet been found to be related to which radioactive isotope parent, and its absolute content does not change with time. because 238 U 235 U and 232 The decay constants of Th are different, which determines the corres...
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