scholarly journals Organic sulfur compositions and their relationships with iron sulfides in Antarctic lake sediments

2022 ◽  
Vol 34 (1) ◽  
pp. 142-150
Author(s):  
Shen Lili ◽  
◽  
Sun Tingting ◽  
Guo Xiaoyu ◽  
Huang Tao
Keyword(s):  
Lake Sediments ◽  
Organic Sulfur ◽  
Iron Sulfides ◽  
Antarctic Lake

The Distribution of Mercury in the Surficial Sediments of Lake Huron

1973 ◽  
Vol 10 (2) ◽  
pp. 194-204 ◽  
Author(s):  
R. L. Thomas
Keyword(s):  
Lake Sediments ◽  
Total Mercury ◽  
Inorganic Phosphorus ◽  
Lake Huron ◽  
Iron Sulfides ◽  
Saginaw Bay ◽  
Fine Grained ◽  
Hydrated Iron Oxide ◽  
Sediment Deposits ◽  
Circulation Patterns

Total mercury has been determined in 163 samples of the topmost 3 cm of sediment taken from Lake Huron during 1969. Total mercury values range from 54 to 805 p.p.b. with a mean of 222 p.p.b. and a standard deviation of 162 p.p.b. The mercury distribution in the lake sediments shows a trend for increasing concentration from nearshore and mid-lake shallow water, coarse sediment deposits outwards into the fine-grained sediments in the deeper water basins. The application of a quartz correction to compensate for the dilution by an inert constituent reveals two major anomalies of higher mercury concentration. The Saginaw anomaly occurs in the southern basins of the lake and is believed to be due to the input of industrial mercury from Saginaw Bay; the Bruce anomaly in the northeastern part of Manitoulin basin is believed to be due to the weathering of sulfide deposits with subsequent concentration in the lake sediments being related to major water circulation patterns in the lake. From statistical analysis the mercury is believed to be bound in the sediments predominantly adsorbed or complexed by organic matter with subsidiary adsorption by the surfaces of iron sulfides and hydrated iron oxide – inorganic phosphorus complexes.

Hydroxy acids in Antarctic lake sediments and their geochemical significance

1988 ◽  
Vol 13 (4-6) ◽  
pp. 785-790 ◽  
Author(s):  
Genki I. Matsumoto ◽  
Kunihiko Watanuki ◽  
Tetsuya Torii
Keyword(s):  
Lake Sediments ◽  
Hydroxy Acids ◽  
Antarctic Lake ◽  
Geochemical Significance

Restriction of sulfate reduction on the bioavailability and toxicity of trace metals in Antarctic lake sediments

2020 ◽  
Vol 151 ◽  
pp. 110807 ◽  
Author(s):  
Yuanqing Chen ◽  
Jingwen Ge ◽  
Tao Huang ◽  
Lili Shen ◽  
Zhuding Chu ◽  
...  
Keyword(s):  
Trace Metals ◽  
Lake Sediments ◽  
Sulfate Reduction ◽  
Antarctic Lake

scholarly journals Diverse Biotransformation of Sulfur in Antarctic Lake Sediments

2021 ◽  
Author(s):  
Lili Shen ◽  
Tao Huang ◽  
Yuanqing Chen ◽  
Zhuding Chu ◽  
Zhouqing Xie
Keyword(s):  
Microbial Communities ◽  
Sulfate Reduction ◽  
Sulfur Oxidation ◽  
Freshwater Ecosystems ◽  
Organic Sulfur ◽  
Antarctic Lake ◽  
Fildes Peninsula ◽  
Degrading Bacteria ◽  
Sulfur Oxidizing ◽  
High Level

Abstract Microbial communities, sulfur isotope of sulfides (δ34SAVS and δ34SCRS) and sulfur and oxygen isotopes of sulfate (δ34SSO4 and δ18OSO4) in sediments were analyzed to study the biotransformation of sulfur in a penguin-affected lake Y2 and a pristine YO from Fildes Peninsula, Antarctic Peninsula. The microbial communities in Y2 were mainly associated with penguin activities, while those in YO were limited by nutrients. The much enriched δ34SSO4 recorded at depth of 30, 41 and 52 cm in Y2 indicates very strong sulfate reduction therein. The sulfur-degrading bacteria Pseudomonas in 0–23 cm of Y2 was 3.5 times as abundant as that of sulfur oxidizing bacteria (SOB), indicating remarkable remineralization of organic sulfur. While abundant SOB and 34S-depleted sulfate indicate considerable sulfur oxidation in 34–56 cm layer in Y2. In YO sediments, the highest abundance of Desulfotalea and the most enriched δ34SSO4 (35.2‰) and δ34SCRS (2.5‰) indicate strongest sulfate reduction in 28 cm layer. High abundance of Pseudomonas indicates active remineralization of organic sulfur in 3–5 cm layer in YO. While the medium δ34SSO4 and considerable abundance of SOB and SRB indicate concurrence of sulfur oxidation and sulfate reduction in other layers in YO. Our results show that high level of organic matter inputs from penguin populations support the diverse microbial community and biotransformation of sulfur in freshwater ecosystems in Antarctica.

scholarly journals Tardigrade eggs and exuviae in Antarctic lake sediments: insights into Holocene dynamics and origins of the fauna

2007 ◽  
Vol 66 (1s) ◽  
pp. 65 ◽  
Author(s):  
John A.E. GIBSON ◽  
Louise CROMER ◽  
Janelle T. AGIUS ◽  
Sandra J. MCINNES ◽  
Nigel J. MARLEY
Keyword(s):  
Lake Sediments ◽  
Antarctic Lake

Holocene environmental changes inferred from Antarctic lake sediments

2020 ◽  
pp. 51-66
Author(s):  
Santiago Giralt ◽  
Armand Hernández ◽  
Sergi Pla-Rabes ◽  
Dermot Antoniades ◽  
Manuel Toro ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Environmental Changes ◽  
Antarctic Lake
Sign in / Sign up

Export Citation Format

Share Document