Effects of Extracellular Polymeric Substances on the Formation and Methylation of Mercury Sulfide Nanoparticles

doi:10.1021/acs.est.0c01456

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Effects of Extracellular Polymeric Substances on the Formation and Methylation of Mercury Sulfide Nanoparticles
	Zhang, ZH ; Si, R ; Lv, JT ; Ji, YY ; Chen, WS ; Guan, WY ; Cui, YX ; Zhang, T
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2020
卷号	54 期号:13 页码:8061-8071
关键词	DISSOLVED ORGANIC-MATTER MOLECULAR-WEIGHT CDS NANOPARTICLES ACTIVATED-SLUDGE AGGREGATION BACTERIA BIOFILM IMPACTS IRON TRANSFORMATIONS
ISSN号	0013-936X
DOI	10.1021/acs.est.0c01456
文献子类	期刊论文
英文摘要	Growing evidence has suggested that microbial biofilms are potential environmental "hotspots" for the production and accumulation of a bioaccumulative neurotoxin, methylmercury. Here, we demonstrate that extracellular polymeric substances (EPS), the main components of biofilm matrices, significantly interfere with mercury sulfide precipitation and lead to the formation of nanoparticulate metacinnabar available for microbial methylation, a natural process predominantly responsible for the environmental occurrence of methylmercury. EPS derived from mercury methylating bacteria, particularly Desulfovibrio desulfuricans ND132, substantially increase the methylation potential of nanoparticulate mercury. This is likely due to the abundant aromatic biomolecules in EPS that strongly interact with mercury sulfide via inner-sphere complexation and consequently enhance the short-range structural disorder while mitigating the aggregation of nanoparticulate mercury. The EPS-elevated bioavailability of nanoparticulate mercury to D. desulfuricans ND132 is not induced by dissolution of these nanoparticles in aqueous phase, and may be dictated by cell-nanoparticle interfacial reactions. Our discovery is the first step of mechanistically understanding methylmercury production in biofilms. These new mechanistic insights will help incorporate microbial EPS and particulate-phase mercury into mercury methylation models, and may facilitate the assessment of biogeochemical cycling of other nutrient or toxic elements driven by EPS-producing microorganisms that are prevalent in nature.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/32830]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Nankai Univ, Tianjin Key Lab Environm Remediat & Pollut Contro, Coll Environm Sci & Engn, Minist Educ,Key Lab Pollut Proc & Environm Criter, Tianjin 300350, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China 3.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
推荐引用方式 GB/T 7714	Zhang, ZH,Si, R,Lv, JT,et al. Effects of Extracellular Polymeric Substances on the Formation and Methylation of Mercury Sulfide Nanoparticles[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(13):8061-8071.
APA	Zhang, ZH.,Si, R.,Lv, JT.,Ji, YY.,Chen, WS.,...&Zhang, T.(2020).Effects of Extracellular Polymeric Substances on the Formation and Methylation of Mercury Sulfide Nanoparticles.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(13),8061-8071.
MLA	Zhang, ZH,et al."Effects of Extracellular Polymeric Substances on the Formation and Methylation of Mercury Sulfide Nanoparticles".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.13(2020):8061-8071.