Factors that cause deviations from Beer and Lambert’s law:

The intense red colour produced on addition of thiocyanate ion to Fe(III) ions is due to the charge transfer complex formed between them.

 Some of the factors responsible for the deviation from Beer and Lambert's law are as follows.

• Presence of Electrolytes
• Hydrogen Ion Concentration
• Complexation, Association or Dissociation
• Non monochromatic nature of the radiation
• Concentration of the Analyte
• Temperature