Elemental and Proximate Compositions of Sesame Seeds and the Underlying Soil from Tsegede, Ethiopia

Table 6

Concentration of standard solutions, coefficient of determination (r²), limit of detection (LOD), recovery, and the associated relative standard deviation (RSD) values of the method used for the determination of metallic elements in the soil samples.

Elements	Concentration (mg/L)	r^2	LOD (mg/kg)	%Recovery	RSD
Zn	0.1, 0.4, 0.8, 1.2, 1.6	0.9985	0.26	90.7 ± 15	6.7
Cu	0.5, 1, 1.5, 2, 3	0.9986	0.23	94.0 ± 1.8	0.5
Fe	0.5, 1, 1.5, 2, 3, 4	0.9986	0.15	89.7 ± 5.3	1.2
Ca	0.5, 1, 2, 4, 8, 10	0.9991	0.09	90.6 ± 2.6	12.0
Mg	0.5, 1, 2, 4, 8, 10	0.9987	0.38	94.2 ± 9.8	2.7