I HAVE PROVIDED THIS LIST OF DANGEROUS CONCENTRATION FOUND IN JUST MY COUNTY
    LOCATED IN A RURAL COMMUNITY IN MISSOURI

Regional Heavy Metal Report

The information below is current as of January 5, 2007 and was derived from the USGS website based on samples taken by the National Geochemical Survey. 

Average concentrations of elements in Lafayette County, Missouri 

Element Symbol Mean Minimum Maximum

Dangerous concentrations are highlighted in (red). 

Aluminum Al (wt%) 4.857 4.121 5.947
Arsenic As (ppm) 19.128 12.313 33.216 
Calcium Ca (wt%) 0.665 0.368 1.361
      Copper Cu (ppm) 16.326 14.003 18.967
      Iron Fe (wt%) 3.200 2.564 3.974
      Mercury Hg (ppm) 0.012 0.010 0.022
      Magnesium Mg (wt%) 0.412 0.331 0.706
Manganese Mn (ppm) 2140.500 898.177 3193.180
Sodium Na (wt%) 0.744 0.403 0.939
      Phosphorus P (wt%) 0.104 0.076 0.188
Lead Pb (ppm) 33.107 22.020 50.239
Selenium Se (ppm) 0.435 0.300 0.740
      Titanium Ti (wt%) 0.263 0.220 0.322
      Zinc Zn (ppm) 72.733 51.029 116.053 

How to read the heavy metal report. 

Each heavy metal report is based on USGS readings from soil samples taken from within the county at different points.

The minimum and maximum are the low and high readings from all the samples taken and the mean is the average.

The symbol represents the periodic table symbol of the particular metal and in the parentheses is the unit of measure used when  measuring each soil

sample (ppm is parts per million and wt% is weight as a percentage of the whole). There is no set standard of how many soil samples are

 taken to soil samples are taken to ascertain the mean, however the mean is a fairly accurate representation of the particular county’s metal content. 

 

Please note, these are soil samples only and do not reflect the metals in aerosol form found in air pollution, 

nor is this a report of water samples, which is yet another source of heavy metals.