Accumulation, spatio-temporal distribution, and risk assessment of heavy metals in the soil-corn system around a polymetallic mining area from the Loess Plateau, northwest China

• Published in: Geoderma 2017-11, Vol.305, p.188-196
• Main Authors: Zang, Fei, Wang, Shengli, Nan, Zhongren, Ma, Jianmin, Zhang, Qian, Chen, Yazhou, Li, Yepu
• Format: Article
• Language: English
• Subjects: Corn grains; Heavy metals; Loess Plateau; Risk assessment; Soils; Spatio-temporal distribution
• ISSN: 0016-7061; 1872-6259
• DOI: 10.1016/j.geoderma.2017.06.008

To investigate the heavy metal concentrations in soil-corn system, 30 pairs of soil (0–20cm) and corn grain samples were collected from Baiyin City, China, a typical industrial oasis in Loess Plateau. The results indicated that the mean concentrations of Cu, Zn, Cd and Pb in agricultural soils from the Dongdagou and Xidagou stream valleys exceeded the soil background concentrations of Gansu Province, China. Correlation analysis showed that the correlation among the total Cu, Zn, Cd and Pb in soils were significant at PZn>Cu>Pb, and Cu, Zn, Cd and Pb belong to safe to heavy pollution. The results of hazard quotient (HQ) indicated that there was no obvious adverse health effect for children and adults. [Display omitted] •Heavy metal contents in corn grains and soils from Loess Plateau, northwest China•Spatial distribution pattern of Cd in corn grains was similar to that of soils.•Temporal distribution of heavy metals in corn grains different from that of soils•Risk assessment of heavy metals in soils was conducted using PI and NIPI.•Health risks of heavy metals in corn grains were assessed for children and adults.