4. Effect of K3[Fe(CN)6] concentration
The influence of potassium ferricynide concentration on the
resultant product and hence the absorbance of sedimented phase
after DLLME procedure was studied. The obtained results showed
that the absorbance is increased by increasing the concentration of
potassium ferricynide up to 16 mmol L1 and above this value it is
decreased again. Therefore, 16 mmol L1 of potassium ferricynide
was selected as optimum concentration.