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).

AreaCuZnNiPbCrHgAsCdReferences

Zhengding21.2269.9625.0418.8057.770.086.160.15This study
Background value21.762.028.820.063.90.02312.10.075Yang et al. (2009) [18]
Grade II100300603502501.0250.6SEPA (1995) [24]
Beijing26.0861.1824.0118.8167.770.0797.680.24 Hu et al. (2004)
Beijing, Tianjin28.271.0NA18.752.30.0927.90.145Qiao et al. (2011) [15]
Alicante22.552.820.922.826.5NANA0.34 Mic et al. (2006) [6]
Ebro17.357.520.517.520.30.036NA0.42 Rodriguez et al. (2006)
Huizhou21.8266.1520.5265.3843.010.2412.760.12Cai et al. (2012) [9]

Grade II (the value for protection of agricultural production and human health).