Wang Shiyu, Wu Wenyong, Liu Fei, Liao Renkuan, Hu Yaqi
China University of Geosciences (Beijing), Beijing, 100083, China.
State Key Laboratory of Simulation and Regulation of the Water Cycle in the River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100048, China.
Environ Sci Pollut Res Int. 2017 Jun;24(18):15209-15225. doi: 10.1007/s11356-017-8909-5. Epub 2017 Apr 29.
The health risks arising from heavy metal pollution (HMP) in agricultural soils have attracted global attention, and research on the accumulation of heavy metals in soil-plant systems is the basis for human health risk assessments. This review studied the accumulation of seven typical heavy metals-Cd, Cr, As, Pb, Hg, Cu, and Zn-in soil-corn and soil-wheat systems. The findings indicated that, in general, wheat was more likely to accumulate heavy metals than corn. Bioconcentration factor (BCF) of the seven heavy metals in wheat and corn grains decreased exponentially with their average concentrations in soil. The seven heavy metals were ranked as follows, in ascending order of accumulation in corn grains: Pb < Cr < Zn < As < Cu < Cd <Hg. As for the order of accumulation in wheat grains, their ranking was as follows: Zn < Pb < Cr < Cu < As < Hg <Cd. The minimum BCFs of Cd, Cr, As, Pb, Hg, Cu, and Zn in corn grains were 0.054, 6.65 × 10, 7.94 × 10, 0.0044, 0.028, 0.13, and 0.19, respectively. The corresponding BCFs values for wheat grains were 0.25, 0.0045, 5.42 × 10, 0.009, 4.03 × 10, 0.11, and 0.054, respectively.
农业土壤中重金属污染（HMP）引发的健康风险已引起全球关注，而研究土壤-植物系统中重金属的积累是人类健康风险评估的基础。本综述研究了七种典型重金属——镉、铬、砷、铅、汞、铜和锌——在土壤-玉米和土壤-小麦系统中的积累情况。研究结果表明，总体而言，小麦比玉米更易积累重金属。小麦和玉米籽粒中七种重金属的生物富集系数（BCF）随其在土壤中的平均浓度呈指数下降。七种重金属在玉米籽粒中的积累量由低到高排序如下：铅＜铬＜锌＜砷＜铜＜镉＜汞。至于在小麦籽粒中的积累顺序，其排序如下：锌＜铅＜铬＜铜＜砷＜汞＜镉。玉米籽粒中镉、铬、砷、铅、汞、铜和锌的最小生物富集系数分别为0.054、6.65×10、7.94×10、0.0044、0.028、0.13和0.19。小麦籽粒的相应生物富集系数分别为0.25、0.0045、5.42×10、0.009、4.03×10、0.11和0.054。
