scholarly journals Air pollution from gas refinery through contamination with various elements disrupts semiarid Zagros oak (Quercus brantii Lindl.) forests, Iran

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Hamed Dadkhah-Aghdash ◽  
Hassan Zare-Maivan ◽  
Mehdi Heydari ◽  
Mohsen Sharifi ◽  
Manuel Esteban Lucas-Borja ◽  
...  
Keyword(s):  
Air Pollution ◽  
Pollution Source ◽  
Contamination Level ◽  
Factors Affecting ◽  
Oak Trees ◽  
Accumulation Index ◽  
Different Seasons ◽  
Quercus Brantii ◽  
Load Indices ◽  
Gas Refinery

AbstractSoils and oak trees (Quercus brantii Lindl.) in Zagros forests are suffering from the air pollution caused by the Ilam Gas Refinery. Thus, for the first time, we investigated the contamination level of sulfur and trace elements in these ecosystems. Sampling of soil and tree leaves was carried out in different seasons of 2019 and at different distances from the gas refinery. The results showed that soils and leaves at the various distances compared with control distance (10,000 m) were more affected by the gas refinery. Distance from the pollution source and physicochemical properties of soils were the main factors affecting contamination of soil elements contents. The soils with pollution load indices (PLI) of 4.54 were in the highly polluted category. Sulfur was at highly polluted category in soils and were highly enriched in trees. The trees mainly absorbed studied elements via their aerial organs. Our findings indicated that oak trees with the highest value of metal accumulation index are influence tools for monitoring various elements in the polluted air produced by the gas refinery. It is recommended that the ecosystem components near the refinery be studied to accurately evaluate disorders in the food chain.

scholarly journals Meteorological Variables and Synoptic Patterns Associated with Air Pollutions in Eastern China during 2013–2018

2020 ◽  
Vol 17 (7) ◽  
pp. 2528 ◽  
Author(s):  
Zhujun Dai ◽  
Duanyang Liu ◽  
Kun Yu ◽  
Lu Cao ◽  
Youshan Jiang
Keyword(s):  
Air Pollution ◽  
Eastern China ◽  
Meteorological Condition ◽  
Temperature Inversion ◽  
Meteorological Conditions ◽  
Meteorological Variables ◽  
Synoptic Situation ◽  
Factors Affecting ◽  
Air Pollutions ◽  
Meteorological Elements

Steady meteorological conditions are important external factors affecting air pollution. In order to analyze how adverse meteorological variables affect air pollution, surface synoptic situation patterns and meteorological conditions during heavy pollution episodes are discussed. The results showed that there were 78 RPHPDs (regional PM2.5 pollution days) in Jiangsu, with a decreasing trend year by year. Winter had the most stable meteorological conditions, thus most RPHPDs appeared in winter, followed by autumn and summer, with the least days in spring. RPHPDs were classified into three patterns, respectively, as equalized pressure (EQP), advancing edge of a cold front (ACF) and inverted trough of low pressure (INT) according to the SLP (sea level pressure). RPHPDs under EQP were the most (51%), followed by ACF (37%); INT was the minimum (12%). Using statistical methods and meteorological condition data on RPHPDs from 2013 to 2017 to deduce the thresholds and 2018 as an independent dataset to validate the proposed thresholds, the threshold values of meteorological elements are summarized as follows. The probability of RPHPDs without rain was above 92% with the daily and hourly precipitation of all RPHPDs below 2.1 mm and 0.8 mm. Wind speed, RHs, inversion intensity(ITI), height difference in the temperature inversion(ITK), the lower height of temperature inversion (LHTI) and mixed-layer height (MLH) in terms of 25%–75% high probability range were respectively within 0.5–3.6 m s−1, 55%–92%, 0.7–4.0 °C 100 m −1, 42–576 m, 3–570 m, 200–1200 m. Two conditions should be considered: whether the pattern was EQP, ACF or INT and whether the eight meteorological elements are within the thresholds. If both criteria are met, PM2.5 particles tend to accumulate and air pollution diffusion conditions are poor. Unfavorable meteorological conditions are the necessary, but not sufficient condition for RPHPDs.

An Approach to Air Pollution Source–Receptor Solution by Angular Distances

2007 ◽  
Vol 188 (1-4) ◽  
pp. 235-245 ◽  
Author(s):  
Jorge F Magallanes ◽  
Leonardo Murruni ◽  
Darío Gomez ◽  
Patricia Smichowski ◽  
Raquel Gettar
Keyword(s):  
Air Pollution ◽  
Pollution Source

ASSESSMENT OF STRONTIUM, RUBIDIUM AND SCANDIUM STATUS IN SOILS AFFECTED BY SOLID WASTE DEPOSITS

2021 ◽  
Author(s):  
Luminita Pirvulescu ◽  
Despina-Maria Bordean ◽  
Loredana Copacean ◽  
Narcis Gheorghe Baghina
Keyword(s):  
Solid Waste ◽  
Soil Analysis ◽  
Reference Sample ◽  
Control Sample ◽  
Pollution Index ◽  
Random Pattern ◽  
Contamination Level ◽  
Accumulation Index ◽  
Waste Deposit ◽  
Waste Deposits

The aim of the study was to assess the level of contamination of soil with strontium, rubidium and scandium in the solid waste deposits. The study was performed on soil samples collected from Moldova Noua, southwest of Romania, an area with historical anthropogenic history. The soil analysis was performed using X-ray fluorescence (XRF). The samples were collected from five collection points using a random pattern from around the illegal waste deposit and all analyses were performed in triplicate. To assess the influence of wastes on the soils concentration levels of strontium (Sr), rubidium (Rb) and scandium (Sc), were calculated contamination factors (CF), and pollution index (PIL) by reporting the concentration of the investigated elements of the upper earth crust concentrations and geo-accumulation index (Igeo) calculated by reporting the elements concentration values to a control sample, used as reference. The reference sample was collected from an area close to the waste deposit but located in a protected green area. The results show that from the investigated elements, scandium is the element of concern, the soil presenting a moderate contamination level with this element.

scholarly journals Natural Productivity, Morphometrics and Seasonal Distribution of Caulerva Racemosa

2021 ◽  
Vol 324 ◽  
pp. 03010
Author(s):  
Tengku Said Raza’i ◽  
Viktor Amrifo ◽  
Imam Pangestiansyah Putra ◽  
Try Febrianto ◽  
Aidil Fadhli Ilhamdy
Keyword(s):  
Seasonal Changes ◽  
Growth Parameters ◽  
Water Dynamics ◽  
Percentage Cover ◽  
Food Ingredients ◽  
Factors Affecting ◽  
Average Value ◽  
Stolon Length ◽  
Different Seasons ◽  
Natural Productivity

Caulerva racemosa seaweed is a superior commodity with both ecological and socio-economical benefits. It is technologically developed into different products which include antioxidants, antibiotics, medicinal ingredients, cosmetics as well as other organic products and also used conventionally as food ingredients for human’s consumption. Meanwhile, the presence of C. racemosa is observed to decrease as the exploitation rate is one of the factors affecting its stock in the nature. Changes in environmental conditions contribute majorly to its availability in aquatic ecosystems. Furthermore, natural factors in the form of seasonal changes that cause fluctuations in water dynamics are the main focus affecting its lifespan. The results showed that C. racemosa growth parameters, which include percentage cover, productivity, together with morphometrics, failed to be significantly affected by seasonal changes. Meanwhile, the highest percentage cover was found during the northern monsoon, which has an average value of 37.99 ± 7.67 (Average±STDEV), while the lowest was during the eastern monsoons with 28.03 ± 9.09 respectively. The best morphometric size was during the northern monsoon with a tallus dimension of 0.25 with an average of 0.201 ± 0.03 and length of 0.825 ± 0.16, a stolon length of 2.09 with an average of 1.95 ± 0.08, 9 stolon grains with an average of 8 ± 0.2. However, the grain diameter, as well as the biomass, was 0.85 gr and 0.054 gr with an average of 0.825 ± 0.22 gr and the grain biomass was with an average of 0.040 ± 0.01 and 0.041 gr with the best average stolon was 0.031 ± 0.01 g in the western season. The results showed that C. racemosa, which grows up in different seasons, having its highest productivity during the northern season and the lowest one was during the eastern season with an average value of 0.439 ± 0.36 kg/m2 as well as 0.326 ± 0.37 Kg/m2, respectively

scholarly journals A Review of Solvent Selection Considerations in Absorption Systems

2019 ◽  
Vol 4 (11) ◽  
pp. 5-10
Author(s):  
I. Ubong ◽  
N. Harry-Ngei ◽  
P. N. Ede
Keyword(s):  
Air Pollution ◽  
Pollution Control ◽  
Review Paper ◽  
Cost Effective ◽  
Flue Gases ◽  
Air Pollution Control ◽  
Absorption System ◽  
Cost Consideration ◽  
Factors Affecting ◽  
Factors Affecting Performance

This review paper focuses on the description, uses and emission removal functions of a solvent with respect to air pollution control of the flue gases in a combustion chamber exhaust waste stream. The physical characteristics of the solvent required for improved and optimal performance of the absorption system where discussed. The factors affecting performance of the solvent with reference to parametric changes in operations as well as cost consideration schemes required to select the most appropriate solvent for increased performance were also ex-rayed. The choice of a solvent that is cost effective and readily available was recommended in the study. 

Identification of factors affecting air pollution by dust aerosol PM10 in Brno City, Czech Republic

2008 ◽  
Vol 42 (37) ◽  
pp. 8661-8673 ◽  
Author(s):  
Zuzana Hrdličková ◽  
Jaroslav Michálek ◽  
Miroslav Kolář ◽  
Vítězslav Veselý
Keyword(s):  
Air Pollution ◽  
Czech Republic ◽  
Dust Aerosol ◽  
Factors Affecting
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