Research Article
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 |
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Average value of three measurements; values are mean ± SD of triplicate analyses. aValues are mean ± SD of triplicate. |