In my sample,i got results as Fe- 0.64 ppm , Al-0.64ppm and Mg-0.23 ppm.Is the level of concentration is enough for soil washing by EDTA?? Or do I need more concentration for removal?
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.
What is the matrix and how extracted?
Fe and Al are natural constituents of the minerals in many soils.
Following the guidelines of CPCB and BIS
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