Does 1 ppm of an element in soil means 1 mg/Kg of the same element in soil?

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Ali R A Moursy

As the soil is a solid material, the concentration of an element will be measured and observed in ppm form which is the same as mg/kg.

Aristos Loucaides

Yes, it does. Just be aware of the basis on which results are expressed, e.g. "dry basis" or "as received basis" and/or "material passing the 2mm sieve" etc. , especially when it comes to interpretation of results and when comparing with regulatory limits.