Table 2.
Mean concentrations (mg kg−1) of potentially toxic elements in different wastewater irrigated crops.
| Metals | Corn | Rice | Wheat | Sugarcane | Millet | FAO/WHO 2001 Limits* mg kg−1 |
|---|---|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | ||
| Cu | 2.23 ± 0.13 | 2.09 ± 0.11 | 2.25 ± 0.53 | 9.94 ± 1.03 | 10.51 ± 0.9 | 40 |
| Range | 2.1–2.35 | 1.97–2.19 | 1.84–2.85 | 9.06–11.08 | 9.69–11.47 | |
| Zn | 59.04 ± 6.2 | 55.18 ± 6.06 | 55.41 ± 18.7 | 79.63 ± 22.6 | 89.52 ± 17.5 | 60 |
| Range | 51.6–63.7 | 48.25–59.5 | 40.2–76.32 | 61.01–104.8 | 73.07–108 | |
| Mn | 25.9 ± 5.63 | 24.2 ± 5.25 | 20.2 ± 8.04 | 5.56 ± 2.71 | 6.63 ± 2.15 | 500 |
| Range | 21.7–32.3 | 20.3–30.2 | 14.93–29.5 | 3.42–8.61 | 4.65–8.91 | |
| Cr | 3.89 ± 0.5 | 3.63 ± 0.47 | 4.01 ± 1.40 | 9.86 ± 2.96 | 8.50 ± 1.65 | 2.3 |
| Range | 3.32–4.24 | 3.1–3.97 | 2.4–4.9 | 6.72–12.6 | 6.96–10.25 | |
| Pb | 2.49 ± 0.31 | 2.33 ± 0.29 | 2.97 ± 1.01 | 0.70 ± 0.01 | 0.71 ± 0.02 | 0.3 |
| Range | 2.31–2.85 | 2.16–2.67 | 2.15–4.1 | 0.7–0.71 | 0.7–0.73 | |
| Fe | 99.8 ± 10 | 93.3 ± 9.3 | 87.3 ± 8.81 | 73.3 ± 7.6 | 77.4 ± 6.6 | – |
| Range | 89–108.8 | 83.23–101.7 | 77.8–95.2 | 66.8–81.73 | 71.4–84.5 | |
| Ni | 2.01 ± 0.49 | 1.88 ± 0.45 | 1.54 ± 0.88 | 0.2 ± 0.15 | 0.26 ± 0.12 | 66.9 |
| Range | 1.63–2.56 | 1.52–2.39 | 0.97–2.55 | 0.09–0.37 | 0.15–0.38 |