Posted: Aug 20 2013 at 11:51am | IP Logged

As  a chemist and former chemistry prof, I can tell you that the amount of lead put into the environment during the years of leaded gas was enormous.  It could be found in wines as the lead oxides settled in the ssoil and were absorbed by the grape vines.  It was found in grains and other foods.  Only after a decade or so of non-use did the rain slowly push the lead far enough into the ground so that plant roots could not easily reach it.