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sunflower /straw

Cu, ash analysis of heavy metals

 value                  literature
----------------------------------
   38.00 ppm                 1
   53.00 ppm                 1
   62.00 ppm                 1
   84.00 ppm                 1
----------------------------------
count                        4
average                  59.25 ppm
standard deviation       16.66 ppm(28 %)

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Austria