The concentrations of Arsenic(As), Cadmium(Cd), Mercury(Hg) and Lead (Pb) in soil, Chinese herbal medicines and Chinese patent medicines were investigated respectively. Furthermore, an In Vitro gastrointestinal digestion test was used to assess the bioaccessibility of arsenic and mercury in some Chinese herbal medicines which accumumate higher concentrations of arsenic and Hg and each patent medicine. After gastrointestinal digestion, preliminary Health Risk Assessment (HRA) of arsenic and mercury wa...