scholarly journals Assessment of PCB trajectories along French river corridors between 1945 and 2018

2020 ◽  
Author(s):  
André-Marie Dendievel ◽  
Brice Mourier ◽  
Alexandra Coynel ◽  
Olivier Evrard ◽  
Pierre Labadie ◽  
...  
Keyword(s):  
Anthropogenic Activities ◽  
Sediment Cores ◽  
Sediment Quality ◽  
Temporal Trends ◽  
Seine River ◽  
Degradation Rates ◽  
Accidental Releases ◽  
Spatio Temporal ◽  
High Concentrations ◽  
Chemical Valley

<p>The reconstruction and modelling of contamination trajectories in rivers is a key concern to investigate spatio-temporal impacts of long-term anthropogenic activities. This issue is highly significant for persistent organic pollutants, such as polychlorinated biphenyls (PCBs), known for their toxicity, their low degradation rates and their hydrophobic properties leading to their accumulation in sediments and biota. Increasingly produced and released worldwide from the 1930s to the 1970-1980s, PCBs were analysed in numerous studies dealing with river sediment quality. However, data syntheses are uncommon at the scale of large hydrosystems, and source-to-estuary approaches along rivers are still needed. Accordingly, we propose an original work integrating PCBs analyses on different solid matrices (sediment cores, bed and flood deposits, suspended particulate matters, and dredged sediments) originating from both research programmes and monitoring. Based on more than 1400 validated analyses, temporal trends of the PCB contamination were reconstructed since 1945 along the four main fluvial corridors in France (Rhône, Seine, Loire and Garonne Rivers). The relationships with socio-environmental factors were also deciphered by integrating hydrological and human spatio-temporal data (cumulative river discharge, population hot spots, urban and industrial surfaces). This work highlighted that the main contaminant trends were driven by regulation, but also by sediment transport and accidental releases (especially since the 1990s). In general, urban and industrial areas were the main contributors to the PCB contamination of rivers: around and downstream of Paris and Rouen (Seine River), Lyon and its “Chemical Valley” (Rhône River), Saint-Etienne and Nantes conurbations (Loire River), and probably downstream of Toulouse and Bordeaux (Garonne River). Relatively high concentrations persisted after the end of the PCB production due to chronic diffuse inputs and accidental releases, particularly on the Rhône River. Moreover, the estimation of specific fluxes revealed that up to 12 µg/m²/yr (i.e. 0.9 t/yr on average) of PCBs were brought by French rivers, especially by the Rhône, Seine and Loire Rivers (ranked in order of importance) to Western European seas since the 1970s.</p>

Temporal trends reconstruction, current and past fluxes estimation and source identification of an industrial lead (Pb) contamination

2020 ◽  
Author(s):  
Thomas Gardes ◽  
Maxime Debret ◽  
Yoann Copard ◽  
Alexandra Coynel ◽  
Matthieu Fournier ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Anthropogenic Impacts ◽  
Sediment Cores ◽  
Temporal Trends ◽  
Geochemical Background ◽  
Recent Sediment ◽  
Seine Estuary ◽  
River Watershed ◽  
Trace Metal Elements ◽  
High Concentrations

<p>The majority of rivers worldwide are contaminated by various trace metal elements (TME) from different anthropogenic origins. Even if anthropogenic impacts are sometimes very old (e.g. Roman era), many studies agree that these impacts have been much more significant since 150 years and the beginning of industrial revolution. Anthropogenic inputs in particulate form, TME being adsorbed on Suspended Particulate Matter (SPM), from various sources can be transported through the watershed depending on hydraulic conditions, which can be lead to storage of these SPM in depositional zones (e.g. reservoirs behind dams, flood plains, ponds). These stored sediments, defined as legacy sediments, are considered as testimonies of past anthropogenic activities and reflect the trajectory of the studied watershed.</p><p>In major European watersheds Pb levels generally exhibit a similar temporal trends (with high concentrations during the 1940-1970s). The temporal trends of Pb in the Eure River Watershed (Normandie, France), the main tributary of the Seine Estuary, was reconstructed from sediment cores sampled in ponds located downstream of the watershed. Pb concentrations variations along the sediment cores were not correlated with grain size and Total Organic Carbon (TOC) variations. Unlike the major European watersheds, the Eure River, showed stable levels until the 1990-2000s, when Pb concentrations have increased significantly and reached a maximum of 859 mg kg<sup>-1</sup>. Despite a decrease in concentrations during the 2010s, Pb contents for recent sediments deposits showed concentrations significantly higher (> 200 mg kg<sup>-1</sup>) than the local geochemical background, estimated at 10.6 mg kg<sup>-1</sup>.</p><p>Lead concentrations on SPM collected monthly with a Time-Integrated Mass-flux Sediments Samplers (TIMS Sampler) in 2017-2018 also showed high concentrations, whose monthly variations were not correlated with the hydro-sedimentary behaviour of the river resulting of non-natural inputs. </p><p>The current particular Pb fluxes estimated for the year 2017 would be the equivalent of 16 % of the total Pb inputs to the Seine Estuary. Theoretical past Pb fluxes have been estimated annually from the Pb concentrations in sediment cores. These estimations showed that during the 1990s, Pb fluxes represented more than 50 % of the total Pb inputs to the estuary and therefore the Eure River watershed was the main Pb contributor to the estuary.</p><p>Lead isotopes ratios confirmed the existence of an additional anthropogenic source, whose signature were more significant during the 1990-2000s. Three-isotope diagram (<sup>208</sup>Pb/<sup>206</sup>Pb vs <sup>206</sup>Pb/<sup>207</sup>Pb) showed that the main source of Pb releases presented an industrial signature. The Pb additional releases have thus been linked with a cathode-ray tubes factory which started operating in 1956 and whose the production has been increased from 1990 to 2000s. The end of industrial activity in the late 2000s did not allow to a return to low concentrations, as evidenced by Pb concentrations in recent sediment deposits and SPM, and this likely related to Pb contaminated soils surroundings this factory and Pb contaminated sediments stored in the riverbanks and channel, which fed the river in Pb during erosion processes.</p>

CONCENTRATION OF Hg, Cd, Cu, Pb AND Zn IN SEDIMENT OF GRESIK WATERS

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Lestari Lestari ◽  
Fitri Budiyanto
Keyword(s):  
Heavy Metal ◽  
Coastal Waters ◽  
Anthropogenic Activities ◽  
Sediment Quality ◽  
The Other ◽  
Environmental Damage ◽  
Sediment Samples ◽  
Water And Sediment ◽  
High Concentrations ◽  
Water And Sediment Samples

Gresik coastal waters is one of the areas that have a potential risk for environmental damage due to anthropogenic activities. Water and sediment samples were collected to determin  metals concentration and to identify sediment quality in February 2012. Twelve samples were collected for analysis of mercury (Hg) and four other metals (Cd, Cu, Pb, and Zn). Mercury was analyzed using USEPA method 7471B with Flameless-AAS (Atomic Absorption Spectrophotometer) varian type SpectarAA VGA 20-76 and the other metals were analyzed using USEPA 30050B with Flame-AAS. Results showed that ranges and average concentrations of Hg were 0.04-0.33 (0.13) mg/kg, Cd 0.08-3.05 (0.64) mg/kg, Cu 23.7-234.0 (85.5) mg/kg, Pb 1.74-12.7 (4.29) mg/kg, and Zn 77.0-405.0 (133.0) mg/kg. Metals with high concentrations were detected in some places and by SQG-Q, surface sediment showed a moderate impact level of biological adverse effects in aquatic sediments. Keywords: mercury, heavy metal, sediment, Gresik.

scholarly journals CONCENTRATION OF Hg, Cd, Cu, Pb AND Zn IN SEDIMENT OF GRESIK WATERS

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Lestari Lestari ◽  
Fitri Budiyanto
Keyword(s):  
Heavy Metal ◽  
Coastal Waters ◽  
Anthropogenic Activities ◽  
Sediment Quality ◽  
The Other ◽  
Environmental Damage ◽  
Sediment Samples ◽  
Water And Sediment ◽  
High Concentrations ◽  
Water And Sediment Samples

<p>Gresik coastal waters is one of the areas that have a potential risk for environmental damage due to anthropogenic activities. Water and sediment samples were collected to determin  metals concentration and to identify sediment quality in February 2012. Twelve samples were collected for analysis of mercury (Hg) and four other metals (Cd, Cu, Pb, and Zn). Mercury was analyzed using USEPA method 7471B with Flameless-AAS (Atomic Absorption Spectrophotometer) varian type SpectarAA VGA 20-76 and the other metals were analyzed using USEPA 30050B with Flame-AAS. Results showed that ranges and average concentrations of Hg were 0.04-0.33 (0.13) mg/kg, Cd 0.08-3.05 (0.64) mg/kg, Cu 23.7-234.0 (85.5) mg/kg, Pb 1.74-12.7 (4.29) mg/kg, and Zn 77.0-405.0 (133.0) mg/kg. Metals with high concentrations were detected in some places and by SQG-Q, surface sediment showed a moderate impact level of biological adverse effects in aquatic sediments.</p> <p>Keywords: mercury, heavy metal, sediment, Gresik.</p>

scholarly journals Spatio-temporal assessment of the polychlorinated biphenyl (PCB) sediment contamination in four major French river corridors (1945–2018)

2020 ◽  
Vol 12 (2) ◽  
pp. 1153-1170 ◽  
Author(s):  
André-Marie Dendievel ◽  
Brice Mourier ◽  
Alexandra Coynel ◽  
Olivier Evrard ◽  
Pierre Labadie ◽  
...  
Keyword(s):  
Western Europe ◽  
Polychlorinated Biphenyl ◽  
Sediment Cores ◽  
Sharp Decrease ◽  
Dry Weight ◽  
Port Authorities ◽  
Suspended Particulate ◽  
Degradation Rates ◽  
Spatio Temporal ◽  
Living Organisms

Abstract. Environmental pollution by polychlorinated biphenyls (PCBs) is a key cause for concern about river quality because of their low degradation rates leading to their accumulation in sediments and living organisms. An original interdisciplinary work was conducted along the four main French rivers (Seine, Rhône, Loire and Garonne rivers), which flow into major European seas. We completed a dataset based on sediment analyses provided by monitoring agencies, port authorities and research teams on different solid matrices (sediment cores, bed and flood deposits, suspended particulate matter and dredged sediments). This dataset focused on the seven indicator PCBs and their sum (ΣPCBi) from 1945 to 2018 (nΣPCBi =1416). Special effort was put into the quality control to provide robust spatio-temporal information. Taking into account hydrological and human drivers, we outlined two main pollution trends: (1) from 1945 to 1975, a quick increase in ΣPCBi (up to 4 mg kg−1 dry weight, dw) and a sharp decrease in the 1980s on the Seine and Loire rivers and (2) increasing but moderate ΣPCBi levels (50 to 150 µg kg−1 dw) followed by a decline after the 1990s on the Rhône and Garonne rivers. In addition to these patterns, PCB emissions from urban and industrial areas or accidental events were significant in each river. Finally, when calculating specific flux, the Rhône exhibited the uppermost ΣPCBi load (up to 12 µgm-2yr-1 in 1977–1987), at least 25 % higher than those of the Seine and Loire rivers, while the Garonne showed a very low flux. In western Europe, we confirmed that the Rhône, Seine and Loire rivers contribute significantly to the PCB contamination of the seas, while French specific ΣPCBi fluxes are 2 orders of magnitude lower than those found in American or Asian rivers. The dataset is available at https://doi.org/10.1594/PANGAEA.904277 (Dendievel et al., 2019).

scholarly journals Environmental DNA preserved in marine sediment for detecting jellyfish blooms after a tsunami

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mizuki Ogata ◽  
Reiji Masuda ◽  
Hiroya Harino ◽  
Masayuki K. Sakata ◽  
Makoto Hatakeyama ◽  
...  
Keyword(s):  
Marine Sediment ◽  
Oil Spills ◽  
Sediment Cores ◽  
Environmental Dna ◽  
Target Species ◽  
Tank Experiment ◽  
Polycyclic Aromatic ◽  
Flow Through ◽  
High Concentrations ◽  
One Year

AbstractEnvironmental DNA (eDNA) can be a powerful tool for detecting the distribution and abundance of target species. This study aimed to test the longevity of eDNA in marine sediment through a tank experiment and to use this information to reconstruct past faunal occurrence. In the tank experiment, juvenile jack mackerel (Trachurus japonicus) were kept in flow-through tanks with marine sediment for two weeks. Water and sediment samples from the tanks were collected after the removal of fish. In the field trial, sediment cores were collected in Moune Bay, northeast Japan, where unusual blooms of jellyfish (Aurelia sp.) occurred after a tsunami. The samples were analyzed by layers to detect the eDNA of jellyfish. The tank experiment revealed that after fish were removed, eDNA was not present in the water the next day, or subsequently, whereas eDNA was detectable in the sediment for 12 months. In the sediment core samples, jellyfish eDNA was detected at high concentrations above the layer with the highest content of polycyclic aromatic hydrocarbons, reflecting tsunami-induced oil spills. Thus, marine sediment eDNA preserves a record of target species for at least one year and can be used to reconstruct past faunal occurrence.

Spatio-temporal trends and climatology of atmospheric chlorinated hydrocarbons over Pakistan

2021 ◽  
Vol 14 (15) ◽  
Author(s):  
Ahmad Hasnain ◽  
Yong Zha ◽  
Muhammad Zaffar Hashmi ◽  
Fatima Rahim ◽  
Yufeng He ◽  
...  
Keyword(s):  
Temporal Trends ◽  
Chlorinated Hydrocarbons ◽  
Spatio Temporal

scholarly journals Spatio-temporal impacts of aerial adulticide applications on populations of West Nile virus vector mosquitoes

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Karen M. Holcomb ◽  
Robert C. Reiner ◽  
Christopher M. Barker
Keyword(s):  
West Nile Virus ◽  
Temporal Trends ◽  
Larval Habitat ◽  
Post Treatment ◽  
Additive Models ◽  
Dispersal Ability ◽  
Stochastic Variation ◽  
West Nile ◽  
Spatial Coverage ◽  
Spatio Temporal

Abstract Background Aerial applications of insecticides that target adult mosquitoes are widely used to reduce transmission of West Nile virus to humans during periods of epidemic risk. However, estimates of the reduction in abundance following these treatments typically focus on single events, rely on pre-defined, untreated control sites and can vary widely due to stochastic variation in population dynamics and trapping success unrelated to the treatment. Methods To overcome these limitations, we developed generalized additive models fitted to mosquito surveillance data collected from CO2-baited traps in Sacramento and Yolo counties, California from 2006 to 2017. The models accounted for the expected spatial and temporal trends in the abundance of adult female Culex (Cx.) tarsalis and Cx. pipiens in the absence of aerial spraying. Estimates for the magnitude of deviation from baseline abundance following aerial spray events were obtained from the models. Results At 1-week post-treatment with full spatial coverage of the trapping area by pyrethroid or pyrethrin products, Cx. pipiens abundance was reduced by a mean of 52.4% (95% confidence intrval [CI] − 65.6, − 36.5%) while the use of at least one organophosphate pesticide resulted in a mean reduction of 76.2% (95% CI − 82.8, − 67.9%). For Cx. tarsalis, at 1-week post-treatment with full coverage there was a reduction in abundance of 30.7% (95% CI − 54.5, 2.5%). Pesticide class was not a significant factor contributing to the reduction. In comparison, repetition of spraying over three to four consecutive weeks resulted in similar estimates for Cx. pipiens and estimates of somewhat smaller magnitude for Cx. tarsalis. Conclusions Aerial adulticides are effective for achieving a rapid short-term reduction of the abundance of the primary West Nile virus vectors, Cx. tarsalis and Cx. pipiens. A larger magnitude of reduction was estimated in Cx. pipiens, possibly due to the species’ focal distribution. Effects of aerial sprays on Cx. tarsalis populations are likely modulated by the species’ large dispersal ability, population sizes and vast productive larval habitat present in the study area. Our modeling approach provides a new way to estimate effects of public health pesticides on vector populations using routinely collected observational data and accounting for spatio-temporal trends and contextual factors like weather and habitat. This approach does not require pre-selected control sites and expands upon past studies that have focused on the effects of individual aerial treatment events.

scholarly journals Recessive Transition Mechanism of Arable Land Use Based on the Perspective of Coupling Coordination of Input–Output: A Case Study of 31 Provinces in China

Land ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 41
Author(s):  
Yi Lou ◽  
Guanyi Yin ◽  
Yue Xin ◽  
Shuai Xie ◽  
Guanghao Li ◽  
...  
Keyword(s):  
Land Use ◽  
Evaluation Model ◽  
Arable Land ◽  
Temporal Trends ◽  
Mainland China ◽  
Input Output ◽  
Transition Mechanism ◽  
Input And Output ◽  
Spatio Temporal ◽  
Arable Land Use

In the rapid process of urbanization in China, arable land resources are faced with dual challenges in terms of quantity and quality. Starting with the change in the coupling coordination relationship between the input and output on arable land, this study applies an evaluation model of the degree of coupling coordination between the input and output (D_CCIO) on arable land and deeply analyzes the recessive transition mechanism and internal differences in arable land use modes in 31 provinces on mainland China. The results show that the total amount and the amount per unit area of the input and output on arable land in China have presented different spatio-temporal trends, along with the mismatched movement of the spatial barycenter. Although the D_CCIO on arable land increases slowly as a whole, 31 provinces show different recessive transition mechanisms of arable land use, which is hidden in the internal changes in the input–output structure. The results of this study highlight the different recessive transition patterns of arable land use in different provinces of China, which points to the outlook for higher technical input, optimized planting structure, and the coordination of human-land relationships.

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