Research Article
Multivariate-Statistical Assessment of Heavy Metals for Agricultural Soils in Northern China
Table 2
A summary of heavy metal concentrations in agricultural soil for various areas (mg/kg).
| Area | Cu | Zn | Ni | Pb | Cr | Hg | As | Cd | References |
| Zhengding | 21.22 | 69.96 | 25.04 | 18.80 | 57.77 | 0.08 | 6.16 | 0.15 | This study | Background value | 21.7 | 62.0 | 28.8 | 20.0 | 63.9 | 0.023 | 12.1 | 0.075 | Yang et al. (2009) [18] | Grade II | 100 | 300 | 60 | 350 | 250 | 1.0 | 25 | 0.6 | SEPA (1995) [24] | Beijing | 26.08 | 61.18 | 24.01 | 18.81 | 67.77 | 0.079 | 7.68 | 0.24 |
Hu et al. (2004) | Beijing, Tianjin | 28.2 | 71.0 | NA | 18.7 | 52.3 | 0.092 | 7.9 | 0.145 | Qiao et al. (2011) [15] | Alicante | 22.5 | 52.8 | 20.9 | 22.8 | 26.5 | NA | NA | 0.34 |
Mic et al. (2006) [6] | Ebro | 17.3 | 57.5 | 20.5 | 17.5 | 20.3 | 0.036 | NA | 0.42 |
Rodriguez et al. (2006) | Huizhou | 21.82 | 66.15 | 20.52 | 65.38 | 43.01 | 0.24 | 12.76 | 0.12 | Cai et al. (2012) [9] |
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Grade II (the value for protection of agricultural production and human health).
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