Comparison of arsenic geochemical evolution in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), China

► Comparative studies of As geochemistry in the Datong Basin and Hetao Basin, China. ► Positive correlations between concentrations of As and Fe/Mn in the Datong Basin. ► No correlation of As and Fe/Mn in the Hetao Basin. ► High concentrations of As, Fe, and Mn occurred in the pe range −2 to −4.