Table 4 Concentrations (mg/kg) of heavy metals in tea samples.
Heavy metals | Detection rate (%) | Concentration (mg/kg) | Mean concentration (mg/kg) | Median (mg/kg) |
|---|---|---|---|---|
Al | 100.0 | 126.00-975.00 | 276.50 ± 148.50 | 227.00 |
As | 100.0 | 0.013–0.17 | 0.054 ± 0.030 | 0.047 |
Ba | 100.0 | 4.01–103.00 | 21.40 ± 15.92 | 16.75 |
Cd | 100.0 | 0.0093-0.17 | 0.040 ± 0.024 | 0.034 |
Cr | 100.0 | 0.044–3.52 | 0.62 ± 0.55 | 0.42 |
Cu | 100.0 | 7.48-31.00 | 13.80 ± 3.68 | 13.25 |
Hg | 69.2 | ND-0.017 | 0.0033 ± 0.0034 | 0.0028 |
Li | 100.0 | 0.025–1.02 | 0.18 ± 0.15 | 0.15 |
Mn | 100.0 | 202.00-2010.00 | 836.00 ± 274.76 | 814.50 |
Ni | 100.0 | 2.03–29.90 | 10.70 ± 4.37 | 10.35 |
Pb | 100.0 | 0.051–1.71 | 0.45 ± 0.30 | 0.37 |
Sb | 98.3 | ND-0.22 | 0.022 ± 0.022 | 0.018 |
Se | 93.3 | ND-0.18 | 0.076 ± 0.040 | 0.076 |
Sn | 94.2 | ND-12.80 | 0.18 ± 1.22 | 0.022 |
V | 100.0 | 0.016–0.71 | 0.11 ± 0.11 | 0.083 |
