AI Article Synopsis
- Mercury levels in Atlantic cod from the Inner Oslofjord have been monitored since 1984 and showed significant increases until 2014.
- The rise in mercury concentrations correlated with an increase in the size of the sampled cod, likely due to low recruitment of younger fish since the early 2000s.
- When adjusting the mercury data to account for cod length, no significant short-term trend in mercury levels was found, suggesting that the earlier increases were largely due to sampling larger fish rather than a general rise in mercury levels.
Article Abstract
Mercury (Hg) in Atlantic cod (Gadus morhua) is one of many parameters that are monitored through OSPAR's Joint Assessment and Monitoring Programme. Time series for cod in the Inner Oslofjord (Norway) go back to 1984. Until 2014, annual median Hg-concentrations in cod from the Inner Oslofjord showed both significant upward long-term (whole time series) and short-term (recent 10 years) trends (when 2015 was included, the short-term trend was not significant). However, the median length of the cod sampled also showed upward trends. This may have been caused by low cod recruitment in the area since the start of the 2000s, as indicated by beach seine surveys. To investigate how length would impact the trend analysis, the Hg-concentrations in the cod were normalised to 50 cm. No significant short-term trend in Hg-concentrations could be detected for length-normalised concentrations. The results indicated that most of the upward trend in Hg-concentrations could be attributed to the sampling of larger fish. The reasons for the apparent change in the cod population demography are not conclusive, however, sampling bias must also be considered.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.marenvres.2017.07.018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
An integrated paper-based microfluidic platform for screening of early-stage Alzheimer's disease by detecting Aβ42.
Lab Chip
January 2025
School of Advanced Technology, Xi'an Jiaotong-Liverpool University, Suzhou, 215000, China.
Alzheimer's disease (AD) is the leading cause of dementia worldwide, and the development of early screening methods can address its significant health and social consequences. In this paper, we present a rotary-valve assisted paper-based immunoassay device (RAPID) for early screening of AD, featuring a highly integrated on-chip rotary micro-valve that enables fully automated and efficient detection of the AD biomarker (amyloid beta 42, Aβ42) in artificial plasma. The microfluidic paper-based analytical device (μPAD) of the RAPID pre-stores the required assay reagents on a μPAD and automatically controls the liquid flow through a single valve.
View Article and Find Full Text PDFSimultaneous nitrogen removal and phosphorus recovery in granular sludge-based partial denitrification/anammox-hydroxyapatite precipitation (PD/A-HAP) process under low C/N ratio and dissolved oxygen limitation.
Bioresour Technol
January 2025
School of Environmental Engineering, Henan University of Technology, Zhengzhou 450001, China; Zhengzhou Key Laboratory of Water Safety and Water Ecology Technology, Zhengzhou 450001, China; Henan International Joint Laboratory of Environmental Pollution Remediation and Grain Quality Security, Zhengzhou 450001, China.
This study integrates partial denitrification/Anammox (PD/A) with hydroxyapatite (HAP) crystallization in a single reactor, achieving simultaneous nitrogen and phosphorus removal along with phosphorus recovery. By adjusting pH, sludge concentration, low COD/TN ratio, and applying moderate dissolved oxygen stress, the system operated stably and promoted the synergistic growth of HAP and biomass. Results showed a nitrogen removal efficiency (NRE) of 94.
View Article and Find Full Text PDFCombinations of substances contributing to death among overdose decedents in Maryland (2020-2021).
Inj Prev
January 2025
Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.
Background: In 2020, Maryland had the fourth-highest opioid overdose mortality rate in the USA. We describe substances identified in postmortem toxicology screening and designated as cause of death (COD) for overdose decedents in Maryland, including specific combinations of substances designated as COD.
Methods: We performed a retrospective analysis of N=5442 adult overdose decedents (ie, manner of death unintentional or undetermined) in Maryland between January 2020 and December 2021.
Leveraging almost hydrophobic PVDF membrane and in-situ ozonation in O/UF/BAC system for superior anti-fouling and rejection performance in drinking water treatment.
Water Res
January 2025
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address:
The almost hydrophobic PVDF membrane (PVDF matrix) commonly exhibited excellent performance in pollutant rejection but with poor anti-fouling performance. This study intended to develop the rejection performance and enhance anti-fouling of the PVDF membrane in an O/UF/BAC system for high quality water production through leveraging the advantages of in-situ ozonation and the nature of the PVDF membrane. Reduced density gradient (RDG) analysis demonstrated that the PVDF membrane exhibited excellent ozone resistance by reducing hydrogen bonds and electrostatic interactions between the membrane surface and ozone.
View Article and Find Full Text PDFDevelopment, analysis, and effectiveness of an F-C-MgO/rGOP catalyst for the degradation of atrazine using ozonation process: Synergistic effect, mechanism, and toxicity assessment.
J Environ Manage
January 2025
Department of Chemistry, College of Science and Humanites at Al-Quway'iyahl, Shaqra University, Saudi Arabia. Electronic address:
This study considered the effects of fluoride, MgO, sucrose, and rGO on the characteristics of the fluoride-carbon-MgO/rGO predicted (F-C-MgO/rGOP) catalyst and its effectiveness in the catalytic ozonation process (COP) for atrazine elimination from aqueous solutions. Using a mixture design, the catalyst composition was optimized to 13.6% sucrose, 50% Mg (OH)2, 25% NaF, and 11.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!