Enhanced availability of mercury bound to dissolved organic matter for methylation in marine sediments

被引:103
作者
Mazrui, Nashaat M. [1 ,2 ]
Jonsson, Sofi [1 ,3 ]
Thota, Sravan [2 ]
Zhao, Jing [2 ]
Mason, Robert P. [1 ,2 ]
机构
[1] Univ Connecticut, Dept Marine Sci, 1080 Shennecossett Rd, Groton, CT 06340 USA
[2] Univ Connecticut, Dept Chem, 55 North Eagleville Rd, Storrs, CT 06269 USA
[3] Univ Gothenburg, Ctr Environm & Sustainabil, Box 170, SE-40530 Gothenburg, Sweden
基金
瑞典研究理事会; 美国国家卫生研究院;
关键词
Mercury; Methylation; DOM; Marine; Sediment; SULFATE-REDUCING BACTERIA; METHYLMERCURY PRODUCTION; SULFIDE NANOPARTICLES; RATES; BIOAVAILABILITY; FLUORESCENCE; DOM; COMPLEXATION; DISSOLUTION; ESTUARIES;
D O I
10.1016/j.gca.2016.08.019
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The forms of inorganic mercury (Hg-II) taken up and methylated by bacteria in sediments still remain largely unknown. From pure cultures studies, it has been suggested that dissolved organic matter (DOM) may facilitate the uptake either by acting as a shuttle molecule, transporting the Hg-II atom to divalent metal transporters, or by binding Hg-II and then being transported into the cell as a carbon source. Enhanced availability of Hg complexed to DOM has however not yet been demonstrated in natural systems. Here, we show that Hg-II complexed with DOM of marine origin was up to 2.7 times more available for methylation in sediments than Hg-II added as a dissolved inorganic complex (Hg-II (aq)). We argue that the DOM used to complex Hg-II directly facilitated the bacterial uptake of Hg-II whereas the inorganic dissolved Hg-II complex adsorbed to the sediment matrix before forming bioavailable dissolved Hg-II complexes. We further demonstrate that differences in net methylation in sediments with high and low organic carbon content may be explained by differences in the availability of carbon to stimulate the activity of Hg methylating bacteria rather than, as previously proposed, be due to differences in Hg-II binding capacities between sediments. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:153 / 162
页数:10
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