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Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province, Northeast China.
Mar Pollut Bull. 2019 May; 142:537-543.MP

Abstract

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.

Authors+Show Affiliations

Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China.Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China. Electronic address: zhengdm@syu.edu.cn.Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China.Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China.Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China.Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China.Environmental College, Shenyang University, Shenyang 110044, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31232335

Citation

Li, Hang, 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, vol. 142, 2019, pp. 537-543.
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. Mar Pollut Bull. 2019;142:537-543.
Li, H., Zheng, D., Yang, J., Wu, C., Zhang, S., Li, H., & 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, 537-543. https://doi.org/10.1016/j.marpolbul.2019.03.066
Li H, et al. Salinity and Redox Conditions Affect the Methyl Mercury Formation in Sediment of Suaeda Heteroptera Wetlands of Liaoning Province, Northeast China. Mar Pollut Bull. 2019;142:537-543. PubMed PMID: 31232335.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Salinity and redox conditions affect the methyl mercury formation in sediment of Suaeda heteroptera wetlands of Liaoning province, Northeast China. AU - Li,Hang, AU - Zheng,Dongmei, AU - Yang,Jisong, AU - Wu,Chenghao, AU - Zhang,Shiwei, AU - Li,Huiying, AU - Ma,Huanchi, Y1 - 2019/04/10/ PY - 2019/01/10/received PY - 2019/03/28/revised PY - 2019/03/31/accepted PY - 2019/6/25/entrez PY - 2019/6/25/pubmed PY - 2019/8/28/medline KW - Methylmercury KW - Salinity KW - Sulfate-reducing bacteria KW - Wetland sediments SP - 537 EP - 543 JF - Marine pollution bulletin JO - Mar Pollut Bull VL - 142 N2 - 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. SN - 1879-3363 UR - https://www.unboundmedicine.com/medline/citation/31232335/Salinity_and_redox_conditions_affect_the_methyl_mercury_formation_in_sediment_of_Suaeda_heteroptera_wetlands_of_Liaoning_province_Northeast_China_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0025-326X(19)30251-6 DB - PRIME DP - Unbound Medicine ER -