Department of Environmental Engineering, JiNan University, Guangzhou 510632, China.
J Hazard Mater. 2012 Aug 15;227-228:148-54. doi: 10.1016/j.jhazmat.2012.05.023. Epub 2012 May 14.
The health risks of heavy metals to local residents via consumption of food crops cultivated in the reclaimed soils of the Pearl River Estuary (PRE) were investigated. Soils in the river estuary were found to be significantly contaminated with heavy metals, with mean concentrations of Cd, 0.858; Pb, 48.7; Cr, 112.4; Cu, 57.3; Zn, 210.8; and Ni, 40.0 mg kg(-1). Rice and root vegetables were also polluted severely. The percentages of rice samples that exceeded the maximum allowable levels were 94.3, 91.4, 88.6, and 17.1% for Pb, Cr, Cd, and Cu, respectively. The accumulation factor (AF) of Cd was the highest compared with the other five metals. The total values of the health risk index (HRI) of Cd and Cu from all the crops were 3.683 and 1.665, respectively. They exceeded considerably the allowable level 1.0. The HRI values of all the metals were mostly from rice consumption. These results suggest that more attention should be directed to the potential health risks of heavy metals to residents living in the tidal flat reclaimed areas.
本研究调查了珠江口围填海土壤上种植的农作物被当地居民食用后，重金属对其健康造成的危害。研究发现，河口水体中的重金属污染严重，Cd、Pb、Cr、Cu、Zn 和 Ni 的平均浓度分别为 0.858、48.7、112.4、57.3、210.8 和 40.0mg/kg。水稻和根茎类蔬菜也受到了严重污染。Pb、Cr、Cd 和 Cu 的超标率分别为 94.3%、91.4%、88.6%和 17.1%。与其他五种金属相比，Cd 的积累因子（AF）最高。所有作物中 Cd 和 Cu 的健康风险指数（HRI）的总和分别为 3.683 和 1.665，均大大超过 1.0 的允许水平。所有金属的 HRI 值主要来自于水稻的食用。这些结果表明，对于居住在围填海区的居民，应更加关注重金属可能带来的健康风险。
