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 1

Quantitative spectrophotometric data of color reaction of PPS with metal ions.

S. no.	Metal ions	Solvent	pH	𝜆max (nm)	𝜀 = 10^3L mol^−1 cm^−1	Solution stability
1	Ni(II)	Methanol : Water	8.0	380	45.0	>24 hr
2	Cu(II)	Methanol : Water	8.0	370	30.0	>24 hr
3	Pd(II)	Methanol : Water	5.0	370	20.0	>24 hr
4	Ag(I)	Methanol : Water	6.0	385	8.5	>6 hr