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The major reservoir for lead is the crust and mantle with a concentration of 11–14.8 ppm. [1] The natural sources (green arrows) of lead in the atmosphere are volcanic eruptions, plant exudates, forest fires, extraterrestrial particles, radioactive decay, and physical and chemical weathering of rocks. [2]
Reduction in the average blood lead level is believed to have been a major cause for falling violent crime rates in the United States. [125] A statistically significant correlation has been found between the usage rate of leaded gasoline and violent crime: the violent crime curve virtually tracks the lead exposure curve with a 22-year time lag.
Atmospheric lead pollution likely caused cognitive decline among citizens of the Roman Empire, according to research published Monday in the Proceedings of the National Academy of Sciences.
Thus EP levels in conjunction with blood lead levels can suggest the time period of exposure; if blood lead levels are high but EP is still normal, this finding suggests exposure was recent. [31] [40] However, the EP level alone is not sensitive enough to identify elevated blood lead levels below about 35 μg/dL. [37] [unreliable medical source?
In 2023, the FDA recalled cinnamon-flavored applesauce pouches from brands like WanaBana, Schnucks, and Weis after detecting lead levels over 5,000 parts per million — more than 2,000 times ...
Exposure to lead in gasoline during childhood resulted in many millions of excess cases of psychiatric disorders over the last 75 years, a new study estimates. ... childhood blood lead levels from ...
[18] [19] One of the theories is a magmatic super plume inducing a high level of CO 2 into the atmosphere. [18] Carbon dioxide levels in the Cretaceous could have been as high as 3.7 to 14.7 times their present amounts today causing an average 2.8 to 7.7 degrees Celsius. [18] Tectonically, movements of the plates and a sea level fall could ...
Clair Cameron Patterson (June 2, 1922 – December 5, 1995) [1] was an American geochemist.Born in Mitchellville, Iowa, Patterson graduated from Grinnell College.He later received his Ph.D. from the University of Chicago and spent his entire professional career at the California Institute of Technology (Caltech).