scholarly journals Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

2018 ◽  
Vol 7 (4) ◽  
pp. e00577 ◽  
Author(s):  
Xin Liu ◽  
Anzhou Ma ◽  
Guoqiang Zhuang ◽  
Xuliang Zhuang
Keyword(s):  
Microbial Communities ◽  
Mercury Methylation ◽  
Rice Paddies ◽  
Mining Areas ◽  
Mercury Mining

scholarly journals Atmospheric Mercury in China Studied with Differential Absorption Lidar

2020 ◽  
Vol 237 ◽  
pp. 03003
Author(s):  
Guangyu Zhao ◽  
Zheng Duan ◽  
Ming Lian ◽  
Sune Svanberg
Keyword(s):  
Environmental Pollutant ◽  
Atmospheric Mercury ◽  
Guizhou Province ◽  
Differential Absorption ◽  
Differential Absorption Lidar ◽  
Mercury Emissions ◽  
Mining Areas ◽  
Main Producer ◽  
Mercury Mining ◽  
Atomic Mercury

Mercury is a very serious environmental pollutant which is intensely studied by many researchers. China is a main producer and consumer of mercury. We have pursued extensive monitoring of atomic mercury using the differential absorption lidar (DIAL) technique, based on a newly constructed mobile monitoring system. Mercury levels in major cities (Guangzhou, Zhengzhou, Xi´a n) were measured, as well as in mercury mining areas in Wanshan, Guizhou province. Further, mercury emissions from the Emperor Qin Mausoleum in Xi´an were investigated together with archaeologists.

Mercury methylation in rice paddies and its possible controlling factors in the Hg mining area, Guizhou province, Southwest China

2016 ◽  
Vol 215 ◽  
pp. 1-9 ◽  
Author(s):  
Lei Zhao ◽  
Guangle Qiu ◽  
Christopher W.N. Anderson ◽  
Bo Meng ◽  
Dingyong Wang ◽  
...  
Keyword(s):  
Southwest China ◽  
Mining Area ◽  
Controlling Factors ◽  
Guizhou Province ◽  
Mercury Methylation ◽  
Rice Paddies ◽  
Hg Mining

A method for measuring the response of sediment microbial communities to environmental perturbations

1984 ◽  
Vol 30 (11) ◽  
pp. 1408-1414 ◽  
Author(s):  
Akira Furutani ◽  
John W. M. Rudd ◽  
C. A. Kelly
Keyword(s):  
Organic Matter ◽  
Microbial Community ◽  
Microbial Communities ◽  
Nitrate Reduction ◽  
Microbial Processes ◽  
Mercury Methylation ◽  
Community Activity ◽  
Environmental Perturbations ◽  
Comprehensive Information

A method has been developed for studying direct and indirect responses of microbial processes in lake sediments to environmental perturbations. Responses of the entire microbial community as well as specific members of the community were studied using in vitro sediment systems for periods of weeks or months under control and experimentally perturbed conditions. Effects of perturbations at the community level were determined by comparing rates of organic matter decomposition (CO2 + CH4 production) in the control and test (acidified) systems. At the same time and under the same conditions, rates of specific processes such as mercury methylation and sulfate and nitrate reduction were assayed to see if these processes responded in the same manner as did the activity of the entire community. Acidification (lowering from pH 6.3 to 4.2) did not affect either community activity or nitrate reduction. However, decreases were observed in sulfate reduction and mercury methylation which were independent of community activity, suggesting that acidification may affect these two specific processes directly. Use of this method provides comprehensive information about the interaction of sediment microbial processes as they respond to environmental perturbations.

scholarly journals Evidence of Mercury Methylation and Demethylation by the Estuarine Microbial Communities Obtained in Stable Hg Isotope Studies

2018 ◽  
Vol 15 (10) ◽  
pp. 2141 ◽  
Author(s):  
Neusa Figueiredo ◽  
Maria Serralheiro ◽  
João Canário ◽  
Aida Duarte ◽  
Holger Hintelmann ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Critical Factor ◽  
High Rate ◽  
Mercury Removal ◽  
Tagus Estuary ◽  
Simultaneous Occurrence ◽  
Mercury Methylation ◽  
Aquatic Environments ◽  
Isotope Studies ◽  
Microbial Methylation

Microbial activity is a critical factor controlling methylmercury formation in aquatic environments. Microbial communities were isolated from sediments of two highly mercury-polluted areas of the Tagus Estuary (Barreiro and Cala do Norte) and differentiated according to their dependence on oxygen into three groups: aerobic, anaerobic, and sulphate-reducing microbial communities. Their potential to methylate mercury and demethylate methylmercury was evaluated through incubation with isotope-enriched Hg species (199HgCl and CH3201HgCl). The results showed that the isolated microbial communities are actively involved in methylation and demethylation processes. The production of CH3199Hg was positively correlated with sulphate-reducing microbial communities, methylating up to 0.07% of the added 199Hg within 48 h of incubation. A high rate of CH3201Hg degradation was observed and >20% of CH3201Hg was transformed. Mercury removal of inorganic forms was also observed. The results prove the simultaneous occurrence of microbial methylation and demethylation processes and indicate that microorganisms are mainly responsible for methylmercury formation and accumulation in the polluted Tagus Estuary.

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