The recoveries of arsenic species varied from 48% to 160% for different CHMs samples from fields and markets or pharmacies (Tables 2 and 3). The mean recovery of As species from shoot of T. kirilowii was 158% and the recovery from root of S. miltiorrhiza was around 50%. The variation of recoveries for arsenic species has been reported in rice samples by Heitkemper et al. (2001) from 31 to 75% and in bran and flour of wheat by Zhao et al. (2010) from 57% rice from European, Bangladeshi, and Indian being inorganic
arsenic but DMA being a main component in rice from the USA. Although Zavala et al. (2008) indicated that genetic differences lead to arsenic speciation variation finally, processing and cultivating conditions are also reasons for the diversity of arsenic speciation in edible plants