Dissolved organic matter kinetically controls mercury bioavailability to bacteria.

摘要: Predicting the bioavailability of inorganic mercury (Hg) to bacteria that produce potent bioaccumulative neurotoxin monomethylmercury remains one greatest challenges in predicting environmental fate and transport Hg. Dissolved organic matter (DOM) affects methylation due its influence on cell physiology (as a potential nutrient) HgII speciation solution complexing agent), therefore controlling Hg bioavailability. We assessed role DOM gram-negative bacterium bioreporter under oxic pseudo- nonequilibrium conditions, using defined media field samples spanning wide range levels. Our results showed was considerably more bioavailable conditions than when absent or had reached pseudoequilibrium (24 h) prior exposure. Under these enhanced uptake followed bell shaped curve as concentrations increased, ...