Use of Ethylenediaminetetraacetic Acid as a Scavenger for Chromium from “Wet Blue” Leather Waste: Thermodynamic and Kinetics Parameters

Table 2

Relative Gibbs free energy values for the complexation reaction in solution ().

Complex	Chromium load	kcal·mol^−1
Cr(EDTA)	+6	0.00
Cr(NTA)(H2O)2	+6	11.73
Cr(collagen)	+6	33.50
Cr(EDTA)	+3	5.76
Cr(NTA)(H2O)2	+3	16.82
Cr(collagen)	+3	36.09