Fig. 1.
Arsenic K-edge XAS spectra of traditional medicines containing arsenic around 10 mg.kg−1 or higher (product name is followed by ID in parentheses). Medicines are ordered from top to bottom from most % As(V)–O to least, and dotted lines indicate best fit. Solid vertical lines indicate locations of As–S, As(III)–O, and the usual position of As (V)–O white line. Samples marked with an * contained As(V)–O partially as As(V)–glycerol.