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 3

Determination of Cd ions in the salt samples.

Sample	𝐶added	𝐶found	Recovery	RSD (%)
	(𝜇g L^−1)	(𝜇g L^−1)	(%)
Rahrahak sample	100.0	93.7	93.7	1.7
Commercial sample	100.0	95.4	95.4	1.4