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Natural Resources: depletion, pollution and toxicology

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Concentrations of metals in sludge

Element

Range

 Typical value
  (mg/kg) (mg/kg ds)
     
Cd 2 - 1,500 20
Cu 200 - 8,000 650
Ni 20 - 5,000 100
Zn 600 - 2,000 1,500
Pb 50 - 3,600 400
Hg 0.2 - 18 5
Cr 40 - 14,000 400
Mo 1 - 40 6
As 3 - 30 20
Se 1 - 10 3
B 15 - 1,000 50
F 60 - 4,000 250

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