PMID: 16519317Mar 8, 2006Paper

Speciation of aqueous methylmercury influences uptake by a freshwater alga (Selenastrum capricornutum)

Environmental Toxicology and Chemistry
P R GorskiM M Shafer

Abstract

Uptake of methylmercury (MeHg) by the alga Selenastrum capricornutum was measured in freshwater batch culture bioassays. The concentration of MeHg in the alga increased rapidly (within 15 min), reached a maximum by 6 h, and then declined because of growth dilution. The alga's rapid growth rate (doubling time, approximately 10 h) contributed to the importance of growth dilution. Conditional first-order rate constants were calculated for uptake (k1 = 6.95 x 10(-9) L/cell/h) and growth (kG = 0.07/h). A competitive synthetic ligand, disodium ethylenediaminetetra-acetate, formed strong complexes with MeHg and reduced MeHg uptake, consistent with the biotic ligand model. A conditional equilibrium formation constant (K) for the MeHg-algae complex was estimated to be approximately 10(16) and was used to model the influence of natural ligands on MeHg bioavailability. Model results suggested MeHg would be most bioavailable at concentrations of dissolved organic matter (DOM) less than 10 mg/L and increasingly unavailable at higher DOM concentrations for the specific humic acid modeled. Similarly, at molar concentrations of sulfide (and, possibly, metal-sulfide clusters) equal to approximately half the MeHg concentration, MeHg was predicte...Continue Reading

Citations

Aug 31, 2011·Environmental Science & Technology·Stéphanie HamelinDolors Planas
May 30, 2009·Ecological Applications : a Publication of the Ecological Society of America·James G Wiener, Thomas H Suchanek
Dec 1, 2011·Food Additives & Contaminants. Part B, Surveillance·Ju-Sung ParkMin-Young Kim
Oct 24, 2009·The Science of the Total Environment·Jonathan R HillDavid R S Lean
May 31, 2015·The Science of the Total Environment·Jonatan ValEnrique Navarro
Oct 16, 2013·Environmental Toxicology and Chemistry·Séverine Le FaucheurVera I Slaveykova
Sep 9, 2008·Environmental Pollution·Patricia Bi FaiBrian J Reid
Jul 19, 2014·The Science of the Total Environment·Marc BeutelEd Shallenberger
Oct 19, 2016·Ecological Applications : a Publication of the Ecological Society of America·Ramsa Chaves-UlloaCelia Y Chen
Nov 9, 2016·Archives of Environmental Contamination and Toxicology·William G LanzaXavier Lazzaro
Sep 1, 2016·Limnology and Oceanography·Cheng-Shiuan Lee, Nicholas S Fisher
Sep 22, 2019·Environmental Pollution·Valerio ZupoKarl J Wittmann
Dec 1, 2009·Environmental Science & Technology·Huan Zhong, Wen-Xiong Wang
Sep 10, 2020·Ecotoxicology and Environmental Safety·Yao SuHuan Zhong
Feb 3, 2007·Environmental Science & Technology·Paul C Pickhardt, Nicholas S Fisher

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