Research Article
Analysis of the Concentration of Heavy Metals in Khat Grown in Meru County and the Assessment of Their Associated Health Risks
Table 4
Concentration of heavy metal content in khat samples collected from Meru County.
| Region in Meru County | Farm code | Metal concentration (mg/kg) | Cr | Cd | Cu | Pb | Fe | Ni |
| Kangeta | A | 16.40 ± 0.23 | 5.51 ± 0.11 | 17.00 ± 0.42 | 24.14 ± 1.26 | 92.90 ± 3.12 | 0.378 ± 0.03 | B | 19.10 ± 0.12 | 5.58 ± 0.10 | 21.18 ± 0.61 | 31.11 ± 1.52 | 139.0 ± 3.64 | 0.386 ± 0.02 |
| Laare | C | 13.90 ± 0.14 | 9.72 ± 0.08 | 16.79 ± 0.32 | 36.29 ± 1.02 | 83.30 ± 2.11 | 0.361 ± 0.03 | D | 17.60 ± 0.25 | 8.88 ± 0.13 | 14.67 ± 0.35 | 42.55 ± 2.45 | 180.5 ± 3.02 | 0.392 ± 0.02 |
| Mutuati | E | 14.60 ± 0.18 | 5.48 ± 0.05 | 13.03 ± 0.26 | 15.53 ± 0.33 | 86.80 ± 2.50 | 0.373 ± 0.01 | F | 19.00 ± 0.31 | 8.53 ± 0.06 | 13.70 ± 0.18 | 25.92 ± 1.92 | 83.40 ± 2.10 | 0.367 ± 0.02 |
| Maua | G | 12.30 ± 0.15 | 9.23 ± 0.05 | 17.23 ± 0.43 | 48.10 ± 2.82 | 72.10 ± 2.13 | 0.352 ± 0.02 | H | 18.00 ± 0.27 | 8.74 ± 0.12 | 14.06 ± 0.32 | <0.001 ± 0.00 | 78.50 ± 2.13 | 0.399 ± 0.04 | I | 15.60 ± 0.16 | 8.32 ± 0.23 | 14.43 ± 0.36 | <0.001 ± 0.00 | 88.50 ± 2.09 | 0.371 ± 0.03 |
| Kianjai | J | 15.00 ± 0.13 | 7.67 ± 0.04 | 19.70 ± 0.52 | 30.10 ± 2.21 | 80.40 ± 1.89 | 0.349 ± 0.02 | K | 14.30 ± 0.11 | 8.28 ± 0.05 | 12.08 ± 0.64 | 37.47 ± 2.02 | 85.50 ± 2.05 | 0.365 ± 0.03 |
| Mean ± SD | | 15.98 ± 2.22 | 7.81 ± 1.56 | 15.81 ± 2.84 | 32.35 ± 9.95 | 97.35 ± 32.67 | 0.372 ± 0.016 |
| RSD (%) | | 13.9 | 20.0 | 18.0 | 30.8 | 33.6 | 4.2 |
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SD, standard deviation; RSD, relative standard deviation.
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