XU Xianju, ZHANG Yongchun, SHEN Rui, CHEN Danyan, WANG Jidong, NING Yunwang, HU Yonghong. Fractionation, distribution and bioavailability of arsenic in soils polluted by combined heavy metals at different growth stages of rice[J]. Ecology and Environment, 2010, 19(8): 1983-1987.