Reversed-Phase Liquid Chromatographic Separation and Determination of Ni(II), Cu(II), Pd(II), and Ag(I) Using 2-Pyrrolecarboxaldehyde-4-phenylsemicarbazone as a Complexing Reagent

Table 3

Analysis of Ni(II), in hydrogenated oil (ghee), and Pd(II), in palladium charcoal.

S. no.	Sample	Metal ion	Amount found with HPLC	Amount found with AAS	Std. Error (%)
1	Pak. ghee oil mills	Ni(II)	2.40 𝜇g/20 g	2.31 𝜇g/20 g	3.8
2	Tullow oil mills	Ni(II)	3.04 𝜇g/20 g	2.96 𝜇g/20 g	2.7
3	Palladium charcoal	Pd(II)	9.80%	*10%	2.0

∗Palladium was not analyzed by AAS; The result was compared with the standard value provided by E. Merck.