Table 1: Examples of different types of extractions with EDTA salts applied to soils and sediments.

Extractant Applied to t L/S [conc] Metals analyzed Reference (NH4)4-EDTA Sediments 1 h 10 mmol/L [38] Na2H2-EDTA Soils 2 h 5 10 mmol/L Cd, Zn, Pb, Cu, and Ni [37] Na2H2-EDTA Na4-EDTA Calcareous soils 22 h 10 250 mmol/L Cd, Pb, Zn, and As [39] H4-EDTA Urban soils 24 h 5 68.4, 13.7 and 27.4 mmol/L Cd, Pb, Zn, and Cu [41] Na2Ca-EDTA Calcareous soils Pb [42]