Distribution of Se and its species in Myriophyllum spicatum and Ceratophyllum demersum growing in water containing se (VI)

► Both species are capable to absorb significant amount of Se (212 and 492 μg Se g−1). ► Percentage of soluble Se compounds in M. spicatum was 48% and in C. demersum 36%. ► The main soluble species in both plants was selenate. ► SeMet and SeMeSeCys were detected at trace levels. ► Identification of SeMeSeCys shows to the same Se pathway as in accumulator plants.