[Retracted] Ternary Complexation Process for New Spectrophotometric Assay of Levodopa using Ni(II) and 2,3-Diaminopyridine

Table 2

Order of addition.

Order number	Order of addition	Absorbance
I	LD + DAP + Ni(II)	0.187
II	DAP + Ni(II) + LD	0.193
III	LD + Ni(II) + DAP	0.231