Mercury methylation by Geobacter metallireducens GS-15 in the presence of Skeletonema costatum

Ding, Ling-Yun1; Zhang, Yao-Yu1; Zhang, Li-Juan1; Fang, Fang1; He, Ning-Ning1; Liang, Peng4; Wu, Sheng Chun4; Wong, Ming Hung2,3; Tao, Hu-Chun1

2019-06-25

10.1016/j.scitotenv.2019.03.222

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

In this study, bacterial mercury (Hg) methylation was investigated under the influence of red-tide algae of Skeletonema costatum (S. costatum). The distribution and speciation of total mercury (THg) and methylmercury (MeHg) were profiled by employing Geobacter metallireducens (G. metallireducens GS-15) as the methylating bacteria. G. metallireducens GS-15 showed different capabilities in methylating different inorganic forms of Hg(II) (HgCl2) and Hg(II)-Algae (HgCl2 captured by S. costatum) to MeHg. In the absence of S. costatum, a maximum methylation efficiency of 4.31 +/- 0.47% was achieved with Hg(II) of 1-100 mu g L-1, while accelerated MeHg formation rate was detected at a higher initial Hg(II) concentration. In the presence of S. costatum, there were distinct changes in the distribution of THg and MeHg by altering the bioavailability of Hg(II) and Hg(II)-Algae. A larger proportion of THg tended to be retained by a higher algal biomass, resulting in decreased methylation efficiencies. The methylation efficiency of Hg(II) decreased from 3.01 +/- 0.10% to 1.01 +/- 0.01% with 10-mL and 250-mL algal media, and that of Hg(II)-Algae decreased from 0.83 +/- 0.13% to 0.22 +/- 0.01% with 10-mL and 250-mL Hg(II)-Algae media. Fourier transform infrared spectrometry, surface charge properties and elemental compositions of S. costatum were used to infer that amine, carboxyl and sulfonate functional groups were most likely to interact with Hg(II) through complexation and/or electrostatic attraction. These results suggest that red-tide algae may be an influencing factor on bacterial Hg methylation in eutrophic water bodies. (C) 2019 Elsevier B.V. All rights reserved.

Mercury Methylmercury Bacteria Algae

SCI ; EI

英语

其他

China Postdoctoral Science Foundation[2018M631267]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000466090500023

ELSEVIER SCIENCE BV

20191306699756

Algae ; Alkylation ; Bacteria ; Biochemistry ; Chlorine compounds ; Efficiency ; Fourier transform infrared spectroscopy ; Mercury (metal) ; Metals ; Methylation

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Chemistry:801 ; Biochemistry:801.2 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Production Engineering:913.1

ENVIRONMENT/ECOLOGY

Web of Science

1.Peking Univ, Shenzhen Grad Sch, Sch Environm & Energy, Key Lab Heavy Met Pollut Control & Reutilizat, Shenzhen 518055, Guangdong, Peoples R China
2.Southern Univ Sci & Technol, State Environm Protect Key Lab Integrated Water G, Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen 518055, Guangdong, Peoples R China
3.Educ Univ Hong Kong, Dept Sci & Environm Studies, CHEER, Tai Po, Hong Kong, Peoples R China
4.Zhejiang Agr & Forestry Univ, Sch Environm & Resource Sci, Linan 311300, Zhejiang, Peoples R China

Ding, Ling-Yun,Zhang, Yao-Yu,Zhang, Li-Juan,et al. Mercury methylation by Geobacter metallireducens GS-15 in the presence of Skeletonema costatum[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,671:208-214.

Ding, Ling-Yun.,Zhang, Yao-Yu.,Zhang, Li-Juan.,Fang, Fang.,He, Ning-Ning.,...&Tao, Hu-Chun.(2019).Mercury methylation by Geobacter metallireducens GS-15 in the presence of Skeletonema costatum.SCIENCE OF THE TOTAL ENVIRONMENT,671,208-214.

Ding, Ling-Yun,et al."Mercury methylation by Geobacter metallireducens GS-15 in the presence of Skeletonema costatum".SCIENCE OF THE TOTAL ENVIRONMENT 671(2019):208-214.