Simultaneous Determination of Mineral Nutrients and Toxic Metals in M. stenopetala from Southern Ethiopia: A Comparative Study of Three Cultivating Areas Using MP-AES

Table 4

Wavelength, LOD, LOQ, correlation coefficient, and calibration curve equation to determine the metals by MP-AES.

Metals	Wavelength (nm)	LOD (mg L^−1)	LOQ (mg L^−1)	Correlation curve
K	766.5	0.036	0.12	y = 0.718x – 4.72 × 10^−6	0.9996
Na	589.0	0.034	0.114	y = 0.689x + 1.46 × 10^−3	0.9981
Ca	393.4	0.026	0.087	y = 0.346x – 6.25 × 10^−5	0.9953
Mg	285.2	0.024	0.08	y = 0.177x + 2.58 × 10^−3	0.9994
Fe	372.0	0.008	0.027	y = 0.322x + 8.45 × 10^−5	0.9987
Co	240.7	0.006	0.02	y = 0.541x + 5.46 × 10^−5	0.9954
Ni	352.5	0.005	0.017	y = 0.451x + 5.35 × 10^−5	0.9976
Mn	403.1	0.005	0.017	y = 0.368x – 3.17 × 10^−4	0.9988
Zn	213.9	0.001	0.004	y = 0.226x – 2.31 × 10^−5	0.9992
Cr	425.4	0.006	0.02	y = 0.212x + 3.16 × 10^−4	0.9994
Cu	324.8	0.003	0.01	y = 0.223x – 5.68 × 10^−5	0.9952
Cd	228.8	0.001	0.004	y = 0.541x + 4.37 × 10^−4	0.9962
Pb	283.2	0.005	0.017	y = 0.541x + 4.37 × 10^−4	0.9997