Is there any standards for heavy metals permissible limit?

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C.A. (Kees) Kan

Permissible levels of heavy metals depend on the matrix in which you determined it.

See guidelines of FAO/WHO, EPA/FDA or EU. Other countries or organizations will also have published their limits.

Paul Milham

What is the matrix and how extracted?

Fe and Al are natural constituents of the minerals in many soils.

Prakash Mallappa Munnoli

Following the guidelines of CPCB and BIS