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  1. Soil Arsenic

    https://dirt.osu.edu/soil-arsenic

    soil As minerals. Average U.S. background soil As ranges from 140 mg kg-1 As and average around 5 mg ... kg-1 As. In central Ohio the maximum background As concentration is around 21 mg kg-1[2], and soils ...

  2. Soil Contaminant Myths and Facts

    https://dirt.osu.edu/myths-and-facts

    screening limit of 400 mg/kg, which is used to identify soils safe for residential use. However, the only ... Facts: Soils with very low lead levels below 100 mg/kg can be used without concern. Soils with low to ... moderate lead levels (100 mg/kg- 800 mg/kg) can be gardened when best practices and soil treatments are ...

  3. Cadmium

    https://dirt.osu.edu/soil-cadmium

    plants, while lead and arsenic are not. Average U.S. background soil Cd 0.1-1.0 mg kg-1 Cd [1]. In central ... Ohio the maximum background Cd concentration is around 0.8 mg kg-1 [2], and soils with Cd ...

  4. Soil Lead

    https://dirt.osu.edu/soil-lead

    naturally occurring soil lead minerals. Average U.S. background soil Pb  22 mg kg-1 Pb [1]. In central Ohio ... the maximum background Pb concentration is around 41 mg kg-1 [2], and soils with Pb concentrations ...

  5. Interpreting Heavy Metal Test Results

    https://dirt.osu.edu/interpretation

      Total  Lead  (ppm or mg ...

  6. Myths and Facts: Lead

    https://dirt.osu.edu/urban-agriculture-outreach/myths-and-facts-lead

    residential soil screening limit of 400 mg/kg, which is used to identify soils safe for residential ...