Sediment-bound inorganic Hg extraction mechanisms in the gut fluids of marine deposit feeders.

摘要: The contributions of different free amino acids and proteins to the overall extraction sediment-bound inorganic mercury (Hg) by gut fluids collected from deposit-feeding sipunculans sea cucumbers were evaluated. organic content Hg concentration in sediment modified investigate their effects on extraction. Cysteine was key acid complexing while also contributed significantly Different size fractions had bindings with at concentrations. first bound 100 kD fraction when increased. Removing matter (OM) sediments enhanced extraction, indicating that competition for binding between strong sites (the matter) (cysteine) may control However, complexation weak (e.g., Fe/Mn oxides)...