Determination of Trace Amount of Cadmium by Atomic Absorption Spectrometry in Table Salt after Solid Phase Preconcentration Using Octadecyl Silica Membrane Disk Modified by a New Derivative of Pyridine

Table 1

Extraction of Cd ion from binary mixtures.

Interference ion	Concentration (mg/L)	Recovery of Cd (II) (%)
Mg^+2	300	96.0 ± 0.5
Ca^+2	1500	95.0 ± 1.0
K^+	100	94.0 ± 1.0
Hg^+2	100	94.0 ± 1.0
As^+3	100	95.0 ± 0.5
Pb^+2	100	89.0 ± 1.0