Analysis of the Concentration of Heavy Metals in Khat Grown in Meru County and the Assessment of Their Associated Health Risks

Table 3

Calibration curves, LODs, and LOQs of the developed ICP-AES method.

Element	Emission line (nm)	Equation	Slope		LOD (mg/kg)	LOQ (mg/kg)
Cd	226.502	Y = 1.7402x − 371	1.7402	0.9855	0.979	2.966
Ni	232.003	Y = 1.1564x + 24	1.1564	0.9994	0.195	0.296
Pb	217.000	Y = 1.6231x − 199	1.6231	0.9967	0.072	0.220
Cr	357.869	Y = 1.3688x − 67	1.3688	0.9953	0.552	1.673
Fe	238.204	Y = 1.3819x − 74	1.3819	0.9930	1.193	3.616
Cu	324.752	Y = 1.4488x − 32	1.4488	0.9958	0.924	2.801