Wind surge influence on flows of heavy metals and polycyclic aromatic hydrocarbons in the Don River delta

2021 ◽  
Author(s):  
Anna Tkachenko ◽  
Veronika Piskareva ◽  
Timur Koshovsky ◽  
Alexander Gennadiev ◽  
Mikhail Lychagin
Keyword(s):  
Heavy Metals ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Bottom Sediments ◽  
Aromatic Hydrocarbons ◽  
Suspended Matter ◽  
Average Concentration ◽  
River Delta ◽  
Low Flow ◽  
Don River ◽  
Polycyclic Aromatic

<p>The Don River Delta is densely populated and subjected to the significant anthropogenic impact caused by agriculture, shipping, recreation and fishing activities. One of the major problems in the delta is wind surges, which cause catastrophic consequences due to the sharp water rise (up to 3,2 meter in 2014). Increasing technogenic pressure coupled with the unstable hydrological regime determines great interest of scientists in its study. Research of aquatic systems of the Don River delta carried out by the authors since 2012. Since that, a great data on heavy metals (HM) and polycyclic aromatic hydrocarbons (PAH) content in water, suspended matter and bottom sediments has been received. The data characterize different hydrological conditions including spring flood, summer and winter low water periods, and water surges of 2014 and 2019.</p><p>The content of HMs and PAHs in water and suspended matter of the Don delta is usually below the world average. There is a significant seasonal and spatial variability in the concentration of pollutants in suspended matter. In general, the majority of heavy metals are characterized by an increase in contents from the top of the delta to the estuary seaside. Deltaic waters were found polluted Cu with the maximum value in the mouth of the main shipping channel. Increased concentrations of HMs and PAHs are observed near or downstream of settlements and industrial facilities. According to seasonal changes the heavy metals in the Don delta can be divided into 2 groups. The first group includes Fe, Mn and Pb, which maximum concentrations are characteristic of the winter low-water period. The second group includes Cu, Ni, Zn and Mo, with the highest content during floods.</p><p>The average concentration of PAHs in the summer-autumn low-water period (300 ng/g) is almost 10 times lower than in the winter low-water period (3000 ng/g). The composition of PAHs in suspended matters is dominated by light compounds: diphenyl-phenanthrene-naphthalene association in the summer-autumn low-water period and phenanthrene-naphthalene-anthracene association during the winter low-water period. Small low-flow channels have a low content of polyarenes.</p><p>Surge events significantly affect the spatial distribution of HMs and polyarenes in suspended matter and bottom sediments, mainly due to an increase in flow turbulence. During the surge the content of HMs and PAHs in upper part of the sediments was found decreased, since in suspended matter increased.</p><p>This work was carried out with the financial support of the RFBR grant 18-05-80094.</p>

scholarly journals Potential Risks of PM2.5-Bound Polycyclic Aromatic Hydrocarbons and Heavy Metals from Inland and Marine Directions for a Marine Background Site in North China

Toxics ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 32
Author(s):  
Qianqian Xue ◽  
Yingze Tian ◽  
Xinyi Liu ◽  
Xiaojun Wang ◽  
Bo Huang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
North China ◽  
Hazard Quotient ◽  
Industrial Process ◽  
Average Concentration ◽  
Diagnostic Ratios ◽  
Lifetime Cancer Risk ◽  
Polycyclic Aromatic

Ambient PM2.5-bound ions, OC, EC, heavy metals (HMs), 18 polycyclic aromatic hydrocarbons (PAHs), 7 hopanes, and 29 n-alkanes were detected at Tuoji Island (TI), the only marine background atmospheric monitoring station in North China. The annual PM2.5 average concentration was 47 ± 31 μg m−3, and the average concentrations of the compositions in PM2.5 were higher in cold seasons than in warm seasons. The cancer and non-cancer risks of HMs and PAHs in cold seasons were also higher than in warm seasons. BaP, Ni, and As dominated the ∑HQ (hazard quotient) in cold seasons, while the non-carcinogenic risk in warm seasons was mainly dominated by Ni, Mn, and As. The ILCR (incremental lifetime cancer risk) values associated with Cr and As were higher in the cold season, while ILCR-Ni values were higher in the warm season. The backward trajectory was calculated to identify the potential directions of air mass at TI. Through the diagnostic ratios of organic and inorganic tracers, the sources of particulate matter in different directions were judged. It was found that ship emissions and sea salt were the main sources from marine directions, while coal combustion, vehicles emissions, industrial process, and secondary aerosols were the main source categories for inland directions. In addition, potential HM and PAH risks from inland and marine directions were explored. The non-cancerous effects of TI were mainly affected by inland transport, especially from the southeast, northwest, and west-northwest. The cancerous effects of TI were mainly simultaneously affected by the inland direction and marine direction of transport.

scholarly journals B-Cyclodextrin Polyurethanes Copolymerised with Beetroot Fibers (Bio-Polymer), for the Removal of Organic and Inorganic Contaminants from Water

2013 ◽  
Vol 2 (1) ◽  
pp. 150 ◽  
Author(s):  
Jamil Rima ◽  
Karine Assaker
Keyword(s):  
Heavy Metals ◽  
Methylene Blue ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Water Treatment ◽  
Aromatic Hydrocarbons ◽  
Rhodamine B ◽  
Industrial Wastewater ◽  
Contaminated Groundwater ◽  
Inorganic Contaminants ◽  
Polycyclic Aromatic

<p>In this study, B-Cyclodextrinn polymerized with beetroot fibers (Bio-polymer), was prepared and applied to the removal of organic and inorganic contaminants from wastewater. An investigation into the use of cross-linked cyclodextrin polyurethanes copolymerised with beetroot fibers as adsorbents for organic pollutants and heavy metals has yielded very useful results which may have an impact in future water treatment applications.</p> The Biopolymer was tested in water contaminated by dyes, polycyclic aromatic hydrocarbons (PAH) and heavy metals. The effectiveness to eliminate dyes such as methylene blue and Rhodamine B with concentrations around 100 ppm was more than 99%, while the pyrene,which was chosen as an example among PAHs, showed a potential of elimination exceeding the 97% for solutions of 10 ppm. Also, heavy metals, such as Lead, Zn, and Cu, were tested and showed an efficacy exceeding the 99.8%. The results indicated that the biopolymer developed in this study has the potential to be a promising material for the removal of mixed pollutants from industrial wastewater or from contaminated groundwater.

scholarly journals Identification and quantification of organic pollutants in the air of the city of Astana using solid phase microextraction

2017 ◽  
pp. 14-17
Author(s):  
Dina Orazbayeva ◽  
Ulzhalgas Karatayeva ◽  
Kulzhan Beysembayeva ◽  
Kulyash Meyramkulova
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Ambient Air ◽  
Average Concentration ◽  
Polycyclic Aromatic ◽  
Benzene Toluene ◽  
The City

Solid-phase microextraction in combination with gas chromatography and mass-spectrometry (GC-MS) was used for determination of benzene, toluene, ethylbenzene and o-xylene (BTEX), polycyclic aromatic hydrocarbons (PAH), and for identification of volatile organic compounds (VOCs) in ambient air of the city of Astana, Kazakhstan. The screening of the samples showed the presence of mono- and polycyclic aromatic hydrocarbons, alkanes, alkenes, phenols, and benzaldehydes. The concentrations of naphthalene were 5-7 times higher than the permissible value, it was detected in all studied air samples. Average concentration of naphthalene was 18.4 μg/m3, acenaphthylene – 0.54 μg/m3, acenaphthene – 1.63 μg/m3, fluorene – 0.79 μg/m3, anthracene – 3.27 μg/m3, phenanthrene – 0.22 μg/m3, fluorantene – 0.74 μg/m3, pyrene – 0.73 μg/m3. Average concentrations of BTEX in the studied samples were 31.1, 84.9, 10.8 and 11.6 μg/m3, respectively. Based on the statistical analysis of the concentrations of BTEX and PAH, the main source of city air pollution with them was assumed to be vehicle emissions.

scholarly journals Isolation and characterization of bacteria with multiple traits: Hydrocarbon degradation, antibiotic-resistant and metal tolerant

2019 ◽  
Vol 10 (4) ◽  
pp. 3789-3795 ◽  
Author(s):  
Neeta Bhagat ◽  
Pranita Roy ◽  
Sohini Singh ◽  
Tanu Allen
Keyword(s):  
Heavy Metals ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Soil Pollution ◽  
Aromatic Hydrocarbons ◽  
Well Being ◽  
Antibiotic Resistant ◽  
Morphological Studies ◽  
Isolation And Characterization ◽  
Degrading Bacteria ◽  
Polycyclic Aromatic

Increasing soil pollution all over the world has instigated global concerns as enormous quantities of toxic chemicals and heavy metals like cadmium, lead, mercury, petrochemicals, insecticides, polycyclic aromatic hydrocarbons (PAHs) and chlorophenols are finding their way into the environment, affecting the land and soil, causing soil pollution and thus posing a threat and menace to health and well- being of people and ecosystem. The ubiquitous dissemination, low bioavailability, high perseverance of contaminants like poly-hydrocarbon and metals in soil have the potentially destructive effects to human health, envisages to study the biodegradation of PAHs (polycyclic aromatic hydrocarbons) and PACs (polycyclic aromatic compounds). The diversity of micro-organisms that diminish the PAHs/PACs can be utilized in the advancement of bioremediation techniques. The role of metal-tolerant, (PAH)-degrading bacteria helps in the biodegradation of organic compounds at miscellaneous polluted sites. The isolation of (PAHs)-degrading bacteria from contaminated soil samples collected from garages and petrol pumps of Delhi and NCR region was carried out in the present study.  Also, the bacterial samples were tested for the tolerance towards 4 heavy metals- arsenic (As), lead (Pb), cadmium (Cd), and mercury (Hg). Morphological studies and biochemical tests were conducted to find the genera of the bacterial samples. The study indicates that hydrocarbons were degraded by the isolates P1, P2, P4, P5, P5*, G1, G3. These isolates were also found to be tolerant at a high concentration of metals (Arsenic, Cadmium, Mercury, and Lead) as minimum inhibitory concentration (MIC) was also calculated. Antibiotic susceptibility of the isolates was tested against various antibiotics. Thus the study suggests that the isolates identified as Pseudomonas aeruginosa, Acinetobacter baumanii, and Klebsiella pneumoniae are not only PAH-degrading but metal-tolerant and antibiotic-resistant too and are of immense potential for bioremediation of contaminated soils.

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