Hi,

Investigation of heavy metals bioavailability from soil focused on releasable, potentially mobilizable and mobile forms. A single-step extraction procedure was used to isolate the individual forms of metals. The releasable forms were determined in a 2M HNO3 using the present relevant method. The potentially mobilizable forms were extracted with 0.05M EDTA and the mobile forms with 0.1M CaCl2.

I am sending to you some useful literature in attachments. I hope it will be helpful for you.

Best of luck

Thank you very much, Zenon. Best of luck, Krystyna

Extraction of soil using EDTA can extract dissolved/soluble and some exchangeable fraction of metals. 

EDTA does not target any specific pool of metals in soil/sediments, however, because of its chelating nature it makes soluble complexes with metals and don't let them re-adsorb or precipitate.

In plant sciences, EDTA extractable fraction of metals is generally considered plant available pool of metals. 

Hope it will help.

Exchangeable fractions can be extracted with EDTA

EDTA can extract soluble , exchangeable , associate with carbonate fractions from soil , so I thank the best method to extract bio-available heavy metal in soil is AB-DTPA. please take a look

Thank you very much, Fathy Elbehiry. Best of luck, Krystyna