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 2

The limits of detection, regression equations, correlation coefficient, preconcentration factor, recovery, and relative standard deviation for extraction method.

Analyte	Regression equation	R ^2	LOD (𝜇g/L)	PF	Recovery (%)	RSD (%)
Cd ion	Y = 0.368X + 0.126	0.9905	5.0	200	98.0 ± 0.5	≤2