scholarly journals Leaching characteristics of naturally derived toxic elements from soils in the western Osaka area: considerations from the analytical results under the Soil Contamination Countermeasures Act

2020 ◽  
Vol 15 (1) ◽  
pp. 119-130
Author(s):  
Hiroko ITO ◽  
Takeshi KATSUMI
Keyword(s):  
Soil Contamination ◽  
Toxic Elements ◽  
Analytical Results ◽  
Leaching Characteristics

scholarly journals Assessment of soil contamination by potentially toxic elements in the aljustrel mining area in order to implement soil reclamation strategies

2010 ◽  
Vol 22 (6) ◽  
pp. 565-585 ◽  
Author(s):  
C. Candeias ◽  
E. Ferreira da Silva ◽  
A.R. Salgueiro ◽  
H.G. Pereira ◽  
A.P. Reis ◽  
...  
Keyword(s):  
Soil Contamination ◽  
Toxic Elements ◽  
Mining Area ◽  
Potentially Toxic Elements ◽  
Soil Reclamation

scholarly journals Environmental Impact Assessment of Potentially Toxic Elements in Soils Near the Runway at the International Airport in Central Europe

2020 ◽  
Vol 12 (17) ◽  
pp. 7224 ◽  
Author(s):  
Martin Brtnický ◽  
Václav Pecina ◽  
Tivadar Baltazár ◽  
Michaela Vašinová Galiová ◽  
Ludmila Baláková ◽  
...  
Keyword(s):  
Soil Contamination ◽  
Ecological Risk ◽  
Toxic Elements ◽  
Risk Index ◽  
Pollution Index ◽  
Transportation Systems ◽  
Potentially Toxic Elements ◽  
Toxic Effects ◽  
Phytotoxicity Test ◽  
Significant Difference

The environmental impacts of air transport and air transportation systems have become increasingly important and are heavily debated. The aim of the study was to determine the degree of soil contamination by the potentially toxic elements (Cu, Ni, Pb, and Zn) in the vicinity of the airport runway and to evaluate whether airport traffic has had factual toxic effects on airport vegetation. The overall assessment of soil contamination by means of the Nemerow integrated pollution index indicated slight pollution; evaluation by the geoaccumulation index evinced moderate contamination by Zn and nonexistent to moderate contamination by Cu, Ni, and Pb. A significant difference between the take-off and landing sections of the runway was not statistically confirmed. The vegetation risk assessment by means of the potential ecological risk index (RI) showed the low ecological risk, while the phytotoxicity test revealed an inhibition of up to 33.7%, with a slight inhibition of 16.7% on average, and thus low toxic effects of airport traffic on airport vegetation. The results of the linear regression model between phytotoxicity and RI manifested no relation between the two. The outcomes from other studies suggest that the range of elements and the extent of contamination can be highly variable at different airports and frequently affected by car traffic. Therefore, further research on this issue is needed for the more precise determination of the elements emitted by air traffic at airports.

The leaching characteristics of common toxic elements in phosphogypsum

2020 ◽  
Vol 20 (4) ◽  
pp. 473-479
Author(s):  
Xin Peng ◽  
Yinger Deng ◽  
Xiangda Zhang ◽  
Lu Liu ◽  
Jian Hu ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Temperature Oscillation ◽  
Wilcoxon Test ◽  
Chemical Compositions ◽  
Content Type ◽  
Leaching Characteristics ◽  
Oscillation Strength ◽  
Leaching Experiments ◽  
Supplementary Material ◽  
Soluble P

Phosphogypsum (PG) is an acid by-product from the production phosphate fertilizers that is produced in large amounts all over the world. However, it is challenging to reuse this waste due to the quantities of various impurities in PG and technical restrictions, resulting in PG accumulation, which threatens adjacent environments. To reduce PG storage and safely utilize PG, the aim of our study was to define the leaching characteristics of the impurities present in PG under different conditions. We found that (1) different leaching experiments showed different leachate profiles (including pH and electrical conductivity values of leachate), which indicated that the liquid/solid (L/S) ratio, temperature, oscillation strength, particle size, and pH have remarkable effects on the concentration of leached impurities; (2) all leachate (i.e. soluble P, fluoride, Zn, Pb, As, and Hg) extraction concentrations were significantly more sensitive to the effect of the L/S ratio and pH than the effect of the other conditions; and (3) the leaching concentration was strongly influenced by pH, and a strong correlation among soluble P, F, As, and Hg concentrations in the leachate was demonstrated by a correlation analysis. In the present study, we revealed a systematic leaching mechanism of potential toxic elements in PG and have provided guidance and a reference for PG resource comprehensive utilization and surrounding environment treatment.Supplementary material: Chemical compositions of the phosphogypsum and pairwise Wilcoxon test results are available at https://doi.org/10.6084/m9.figshare.c.5088187

scholarly journals Response of Three Miscanthus × giganteus Cultivars to Toxic Elements Stress: Part 1, Plant Defence Mechanisms

Plants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2035
Author(s):  
Karim Suhail Al Souki ◽  
Clarisse Liné ◽  
Francis Douay ◽  
Bertrand Pourrut
Keyword(s):  
Soil Contamination ◽  
Contaminated Soils ◽  
Toxic Elements ◽  
Plant Defence ◽  
Ex Situ ◽  
Tolerance Strategy ◽  
Miscanthus Giganteus ◽  
Plant Stem ◽  
Contamination Levels ◽  
Plant Defence Mechanisms

Miscanthus × giganteus demonstrated good phytostabilization potentials in toxic element (TE) contaminated soils. However, information about its tolerance to elevated concentrations is still scarce. Therefore, an ex-situ pot experiment was launched using three cultivars (termed B, U, and A) grown in soils with a gradient Cd, Pb and Zn concentrations. Control plants were also cultivated in non-contaminated soil. Results show that the number of tillers per plant, stem diameter as well as leaf photosynthetic pigments (chlorophyll a, b and carotenoids) were negatively impacted by soil contamination. On the other hand, phenolic compounds, flavonoids, tannins, and anthocyanins levels along with the antioxidant enzymatic activities of superoxide dismutase, ascorbate peroxidase and glutathione reductase increased in the plants grown on contaminated soils. Altogether, these data demonstrate that miscanthus is impacted by concentrations of toxic elements yet is able to tolerate high levels of soil contamination. These results may contribute to clarifying the miscanthus tolerance strategy against high contamination levels and its efficiency in phytoremediation.

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