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• W2326897445 abstract "Predicting the bioavailability of inorganic mercury (Hg) to bacteria that produce the potent bioaccumulative neurotoxin monomethylmercury remains one of the greatest challenges in predicting the environmental fate and transport of Hg. Dissolved organic matter (DOM) affects mercury methylation due to its influence on cell physiology (as a potential nutrient) and its influence on HgII speciation in solution (as a complexing agent), therefore controlling Hg bioavailability. We assessed the role of DOM on HgII bioavailability to a gram-negative bacterium bioreporter under oxic pseudo- and nonequilibrium conditions, using defined media and field samples spanning a wide range of DOM levels. Our results showed that HgII was considerably more bioavailable under nonequilibrium conditions than when DOM was absent or when HgII and DOM had reached pseudoequilibrium (24 h) prior to cell exposure. Under these enhanced uptake conditions, HgII bioavailability followed a bell shaped curve as DOM concentrations increased, both for defined media and natural water samples, consistent with bioaccumulation results in a companion paper (this issue) observed for amphipods. Experiments also suggest that DOM may not only provide shuttle molecules facilitating Hg uptake, but also alter cell wall properties to facilitate the first steps toward HgII internalization. We propose the existence of a short-lived yet critical time window (<24 h) during which DOM facilitates the entry of newly deposited HgII into aquatic food webs, suggesting that the bulk of mercury incorporation in aquatic food webs would occur within hours following its deposition from the atmosphere." @default.
• W2326897445 created "2016-06-24" @default.
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• W2326897445 date "2014-02-28" @default.
• W2326897445 modified "2023-10-06" @default.
• W2326897445 title "Dissolved Organic Matter Kinetically Controls Mercury Bioavailability to Bacteria" @default.
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• W2326897445 doi "https://doi.org/10.1021/es4038484" @default.
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