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Organic ligands control the concentrations of dissolved iron in Antarctic sea ice
Publication date: Available online 3 June 2015 Source:Marine Chemistry Author(s): Delphine Lannuzel , Marco Grotti , Marie Luisa Abelmoschi , Pier van der Merwe The organic complexation of dissolved iron (DFe) was assessed in 5 snow, 34 sea ice, 12 brine and 24 under-ice seawater samples collected during a 22day time series in the East Antarctic sector in austral summer 2009. Similar to seawater, over 99% of DFe was bound to organic ligands in snow, sea ice and brines throughout the study. Dissolved organic ligand and Fe concentrations were higher in the brines and sea ice than in snow and seawater samples. In sea ice, [...
Source: Marine Chemistry - June 5, 2015 Category: Chemistry Source Type: research
Carbonate parameters in high and low productivity areas of the Sulu Sea, Philippines
This study suggests that the upwelling area within the Sulu Sea, albeit limited in size, could be a source of CO2 to the atmosphere especially during the stronger northeast monsoon periods. Other processes such as dissolution of CaCO3 in the sediments and possible organic acidity should be considered in understanding the Sulu Sea's CO2 sink capacity for the coming years.
Source: Marine Chemistry - August 12, 2017 Category: Chemistry Source Type: research
Organic ultraviolet (UV) filters in the South China sea coastal region: Environmental occurrence, toxicological effects and risk assessment.
This study reports the occurrence, toxicological effects and risk assessment of eleven commonly consumed UV filters in marine surface water collected from the South China Sea (SCS) coastal region. The concentrations of UV filters ranged from <MDL to 145 ng/L in the SCS, in which benzophenone-3, octocrylene and butyl methoxydibenzoylmethane were the most dominant compounds with their detection frequencies over 97%. Relatively higher levels of total UV filters were found near the highly industrialized and urbanized Pearl River Estuary (PRE) and the concentrations gradually decreased towards the SCS. In general, the envi...
Source: Ecotoxicology and Environmental Safety - May 29, 2019 Category: Environmental Health Authors: Tsui MMP, Chen L, He T, Wang Q, Hu C, Lam JCW, Lam PKS Tags: Ecotoxicol Environ Saf Source Type: research
Effect of altitude and distance from the sea on fractionation processes of Persistent Organic Pollutants (POPs) associated to atmospheric aerosol from Ross Sea to Dome C, Antarctica
Publication date: September 2019Source: Microchemical Journal, Volume 149Author(s): Stefania Giannarelli, Massimo Onor, Carlo Abete, Marco Termine, Roger FuocoAbstractThis paper deals with both the transport processes of several classes of organic pollutants in a large area of Victoria Land and Ross Sea (Antarctica) and the role played by marine aerosol which involves the exchange process between the sea surface and the atmosphere.The mechanisms of transfer process from the seawater to the atmosphere and aerosol of three major classes of pollutants (Polycyclic Aromatic Hydrocarbons, PAHs, Polychlorobiphenyls, PCBs, and Org...
Source: Microchemical Journal - June 6, 2019 Category: Chemistry Source Type: research
Accumulation and ecological risk of heavy metals in soils along the coastal areas of the Bohai Sea and the Yellow Sea: A comparative study of China and South Korea.
This study is the first comprehensive work in the YSLME encompassing 122 coastal locations along the Bohai Sea (BS), Yellow Sea of China (YSC), and Yellow Sea of South Korea (YSK). Soil HM pollution showed great spatial variations cross the regions and countries. Accumulations of As, Cu, Pb, and Zn in the YSK were significantly higher than those in the BS and YSC (p < 0.05). Whilst the elevated Cd, Hg, and Ni in soils were found in the BS and YSC compared to those in the YSK (p < 0.05). Meantime, the assessment of ecological risk posed by HMs indicated higher potential risk in the BS than other coastal areas. In ...
Source: Environment International - January 30, 2020 Category: Environmental Health Authors: Liu P, Hu W, Tian K, Huang B, Zhao Y, Wang X, Zhou Y, Shi B, Kwon BO, Choi K, Ryu J, Chen Y, Wang T, Khim JS Tags: Environ Int Source Type: research
Legacy and emerging per- and polyfluoroalkyl substances (PFAS) in sediments from the East China Sea and the Yellow Sea: Occurrence, source apportionment and environmental risk assessment
In this study, the concentration of legacy and emerging per- and polyfluoroalkyl substances (PFAS) in marine sediments from the YS and ECS were investigated. Nineteen PFAS were identified, ranging in concentration from 0.21 ng/g to 4.74 ng/g (mean: 1.60 ng/g). Legacy long-chain PFAS [e.g., perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), and perfluorooctane sulfonate (PFOS)] were the dominant contaminants. Alternative PFAS such as 6:2 chlorinated polyfluorinated ether sulfonate (6:2 Cl-PFESA) and 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy) propanoic acid (HFPO-DA) were identified within the detect...
Source: Chemosphere - June 10, 2021 Category: Chemistry Authors: Huifang Zhong Minggang Zheng Yong Liang Yingjun Wang Wei Gao Yawei Wang Guibin Jiang Source Type: research
Trace elements in the shoreline and seabed sediments of the southern Caspian Sea: investigation of contamination level, distribution, ecological and human health risks, and elemental partition coefficient
This study assesses the occurrence of trace elements (TEs) in sediments of the southern Caspian Sea. A total of 16 shoreline sediment samples and 15 seabed sediment samples along five coastal transects were studied. The mean concentration of TEs follows the order of Zn > V > Cr > Ni > Cu > Pb > Co > As > Sb > Mo > Cd. The TEs had an uneven, heterogeneous distribution within the shoreline and seabed sampling sites. This is due to that the study area comprises a large number of different pollution sources, also different sediment physicochemical characteristics. Levels of individual TEs within t...
Source: Environmental Science and Pollution Research International - June 24, 2021 Category: Environmental Health Authors: Mohammad Javad Nematollahi Behnam Keshavarzi Farid Moore Rolf David Vogt Hassan Nasrollahzadeh Saravi Source Type: research
Molecules, Vol. 26, Pages 5889: Analysis of Volatile Compounds in Sea Bass (Lateolabrax japonicus) Resulting from Different Slaughter Methods Using Electronic-Nose (E-Nose) and Gas Chromatography-Ion Mobility Spectrometry
In this study, the influence of slaughter methods on the volatile compounds (VOCs) in sea bass was investigated using electronic nose (E-nose) technology and gas chromatography-ion mobility spectrometry (GC-IMS). VOCs in raw and cooked sea bass resulting from different slaughter methods were effectively distinguished using both techniques. Aldehydes, ketones, and alcohols were associated with the basic flavor of sea bass, whereas esters, organic acids, and furans enriched the aroma. In raw sea bass, the fishy odor was the strongest in the HSD group (head shot control death), followed by that in the IFD (ice faint to death)...
Source: Molecules - September 28, 2021 Category: Chemistry Authors: Yueqi Wang Jinxing Li Yanyan Wu Shengyuan Yang Di Wang Qiang Liu Tags: Article Source Type: research
Sea Ice Dynamics Drive Benthic Microbial Communities in McMurdo Sound, Antarctica
This study provides the first assessment of how legacy sea ice conditions influence benthic microbial communities in Antarctica, contributing insight into sea ice–benthic coupling and ecosystem functioning in a polar environment.
Source: Frontiers in Microbiology - October 28, 2021 Category: Microbiology Source Type: research
Multispecies populations of methanotrophic < em > Methyloprofundus < /em > and cultivation of a likely dominant species from the Iheya North deep-sea hydrothermal field
This study reveals the existence of free-living Methyloprofundus variants in the Iheya North deep-sea hydrothermal field in the mid-Okinawa Trough. A clade-targeted amplicon analysis of the particulate methane monooxygenase gene (pmoA) detected 647 amplicon sequence variants (ASVs) of the Methyloprofundus clade in microbial communities newly formed in in situ colonization systems. Such systems were deployed at colonies of bathymodiolin mussels and a galatheoid crab. These ASVs were classified into 161 species-like groups. The proportion of the species-like groups representing endosymbionts of mussels was unexpectedly low. ...
Source: Applied and Environmental Microbiology - November 17, 2021 Category: Microbiology Authors: Hisako Hirayama Yoshihiro Takaki Mariko Abe Hiroyuki Imachi Tetsuro Ikuta Junichi Miyazaki Eiji Tasumi Katsuyuki Uematsu Akihiro Tame Miwako Tsuda Keiko Tanaka Yohei Matsui Hiromi Watanabe Hiroyuki Yamamoto Ken Takai Source Type: research
