Some approaches were suggested by Chakrabarti et al. to measure metal speciation in different matrices [13]. The determination of metal forms in water samples and the experimental determination of the interactions of the metal with
the different components of a sample matrix in simplified model systems are used for this purpose. Different compounds
which include the analyte can be separated by solvent extraction, solid phase extraction, adsorption, ion exchange,
filtration, or ultrafiltration steps followed by elemental determination in the different fractions.