4USEPA. 1999. Human health and ecological risk assessment support to the development of teehnieal standards for emissions from combustion units burning hazardous wastes; Background document [R]. Washington D. C. : Office of Solid Waste and Emergency Response.
5USEPA. 2000. Risk-based concentration table. Philadelphia PA [ R ]. Washington D. C. : United States Environmental Protection Agency.
7Watanabe T, Nakatsuka H, Ikedam M. 1989. Cadmium and lead contents in rice available in various areas of Asia [ J ]. The Science of the Total Environment, 80 : 175-184.
8Williams P N, Price A H, Raab A, et al. 2005. Variation in arsenic speciation and concentration in paddy rice related to dietary exposure [ J]. Environment Science & Technology, 39:5531-5540.
9Williams P N, Villada A, Raab A, et al. 2007. Greatly enhanced arsenic shoot assimilation in rice leads to elevated grain export; comparison with wheat and barley [ J ]. Environment Science & Technology, 41 : 6854-6859.
10Stone R. 2008. Arsenic and paddy rice: A neglected cancer risk? [ J]. Science, 321 : 184-185.