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Blood lead levels (BLLs) were determined by Total Reflection X-ray Fluorescence in a randomly sampled population living in the metropolitan zone of Mexico Valley (MZMV) at the beginning of 2001. Blood was digested and iron extracted by methyl-isobutyl-ketone, the latter in order to improve the detection limit. The geometric mean was 2.00 μgdl -1 , 91% lower than the one obtained in 1980...
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