气候变化领域集成服务门户(CCPortal): Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province; Northeast China

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DOI	10.1016/j.marpolbul.2019.03.066
	Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province; Northeast China
	Li H.; Zheng D.; Yang J.; Wu C.; Zhang S.; Li H.; Ma H.
发表日期	2019
ISSN	0025326X
起始页码	537
结束页码	543
卷号	142
英文摘要	Using a laboratory simulation experiment, we studied the trend of change in methylmercury (MeHg) content of sediments in response to the changing salinity of flooding water (deionized water, 0.5%, 1.0%, 1.5%, and 2.0%) and sulfate-reducing bacteria (SRB) content for both the surface layer (0–10 cm) and the bottom layer (10–20 cm) of Suaeda heteroptera wetland sediments in the Liaohe estuary under anaerobic and aerobic conditions, respectively. The results showed that under AAC (anaerobic conditions), the MeHg content in the surface and bottom sediment layers increased first and then decreased over time and was highest at the 14th day. In contrast, under AC (aerobic conditions), the MeHg content in sediments of both layers increased slowly with increasing test time. The MeHg content in sediments increased first and then decreased with rising salinity and was highest at a salinity of 1.0%. Among the samples collected at different experimental stages, the SRB content in the sediments showed a decreasing trend with rising flooding salinity under AAC and AC. The MeHg and SRB contents were higher under anaerobic conditions than under aerobic conditions. Linear fitting results showed that there was no linear correlation between MeHg contents and SRB quantities in surface and bottom sediments under AAC and AC (R2 < 0.1). Collectively, these results suggest an important role for flooding salinity and anaerobic-aerobic conditions in the production of MeHg in S. heteroptera wetlands of the Liaohe estuary, and may predict the ecological risk of methylmercury according to the change of salinity. © 2019
英文关键词	Methylmercury; Salinity; Sulfate-reducing bacteria; Wetland sediments
语种	英语
scopus关键词	Aerobic bacteria; Deionized water; Floods; Mercury (metal); Mercury compounds; Oxic sediments; Sulfur compounds; Wetlands; Aerobic condition; Anaerobic conditions; Laboratory simulation; Linear correlation; Methyl mercury; Salinity; Sulfate reducing bacteria; Wetland sediments; Anoxic sediments; deionized water; methylmercury; sea water; methylmercury derivative; experimental study; methylmercury; redox conditions; salinity; sediment chemistry; sulfate-reducing bacterium; wetland; aerobic capacity; Amaranthaceae; anaerobic capacity; Article; chemical composition; China; concentration (parameter); environmental exposure; estuary; flooding; Gram negative anaerobic bacteria; oxidation reduction potential; physical chemistry; risk factor; salinity; sediment; Suaeda heteroptera; surface area; analysis; animal; chemistry; environmental monitoring; microbiology; oxidation reduction reaction; salinity; sediment; water pollutant; wetland; China; Liaohe Estuary; Liaoning; Suaeda heteroptera; Animals; Chenopodiaceae; China; Environmental Monitoring; Estuaries; Floods; Geologic Sediments; Methylmercury Compounds; Oxidation-Reduction; Salinity; Water Pollutants, Chemical; Wetlands
来源期刊	Marine Pollution Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/149918
作者单位	Environmental College, Shenyang University, Shenyang, 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang, 110044, China
推荐引用方式 GB/T 7714	Li H.,Zheng D.,Yang J.,et al. Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province; Northeast China[J],2019,142.
APA	Li H..,Zheng D..,Yang J..,Wu C..,Zhang S..,...&Ma H..(2019).Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province; Northeast China.Marine Pollution Bulletin,142.
MLA	Li H.,et al."Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province; Northeast China".Marine Pollution Bulletin 142(2019).