Table 2: Comparison of sensitivity of some spectrophotometric methods for the determination of dopamine.

Method Molar absorptivity (L·mol−1·cm−1) Reference Reaction with 1,2-naphthoquinone-4-sulfonate 2.78 × 103 [14] Diazotised with sulphamic acid 4.2 × 103 [16] Isoniazid in the presence of -bromosuccinimide 6.47 × 103 [15] Thiosemicarbazide 2.4 × 104 [20] Potassium ferricyanide-Fe(III) 3.2 × 104 [19] Diazotised sulphanilamide in the presence of molybdate 5.39 × 104 [17] Proposed method (solid phase spectrophotometry) 1.78 × 105 This work