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

Table 2

Percentage recovery test results of heavy metals in khat samples.

Heavy metal	Concentration in nonspiked khat sample (mg/kg)	Amount added (mg/kg)	Concentration in spiked khat sample (mg/kg)	Percentage recovery (%)^a
Cu	16.36	3.50	19.90 ± 0.08	101.1 ± 0.3
Cd	7.64	1.50	9.09 ± 0.11	96.7 ± 0.9
Pb	24.45	2.00	26.43 ± 0.07	99.0 ± 0.2
Fe	91.78	5.00	96.47 ± 0.80	93.8 ± 0.6
Ni	0.36	1.00	1.34 ± 0.01	98.0 ± 0.2
Cr	16.14	2.50	18.59 ± 0.20	98.0 ± 0.7

Average value of three measurements; values are mean ± SD of triplicate analyses. ^aValues are mean ± SD of triplicate.