Adsorption of potentially toxic metals on negatively charged liposomes: equilibrium isotherms and quantitative modeling

RSC Advances ◽  
2014 ◽  
Vol 4 (80) ◽  
pp. 42591-42597 ◽  
Author(s):  
Yanjun Yu ◽  
Xinhui Liu ◽  
Wenwen Gong ◽  
Guannan Liu ◽  
Dengmiao Cheng ◽  
...  
Keyword(s):  
Metal Ions ◽  
Toxic Metals ◽  
Quantitative Model ◽  
Quantitative Modeling ◽  
Equilibrium Isotherms ◽  
Potentially Toxic Metals ◽  
Adsorption Data ◽  
Adsorption Intensity

The adsorption data of ten metal ions on liposomes fit Freundlich equilibrium well. Covalent index of metal ions affect significantly the adsorption intensity (n). A quantitative model of KF with metal ionic properties were established by PLS.

scholarly journals Detection of potentially toxic metals by SERS using salen complexes

The Analyst ◽  
2016 ◽  
Vol 141 (20) ◽  
pp. 5857-5863 ◽  
Author(s):  
Julie Docherty ◽  
Samuel Mabbott ◽  
Ewen Smith ◽  
Karen Faulds ◽  
Christine Davidson ◽  
...  
Keyword(s):  
Metal Ions ◽  
Toxic Metals ◽  
Metal Ion ◽  
Potentially Toxic Metals ◽  
Salen Complexes

Four metal ions have been clearly discriminated using SERS by coordinating each species to salen. The spectra acquired demonstrated characteristic differences, allowing identification of each metal ion.

scholarly journals Accumulation of Potentially Toxic Metals in Egyptian Alluvial Soils, Berseem Clover (Trifolium alexandrinum L.), and Groundwater after Long-Term Wastewater Irrigation

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 713
Author(s):  
Ahmed S. Abuzaid ◽  
Hossam S. Jahin ◽  
Amany A. Asaad ◽  
Mohamed E. Fadl ◽  
Mohamed A. E. AbdelRahman ◽  
...  
Keyword(s):  
Toxic Metals ◽  
Translocation Factor ◽  
Wastewater Irrigation ◽  
Alluvial Soils ◽  
Trifolium Alexandrinum ◽  
Potentially Toxic Metals ◽  
Groundwater Samples ◽  
Safe Limits ◽  
Berseem Clover ◽  
Irrigated Soils

The reduced availability of water resources in Egypt has imposed the need to intensify the use of wastewater for crop irrigation in the alluvial soils of anthropogenic origin. Relevant effects can derive from contents of potentially toxic metals (PTMs) in supply resources soils, crops, and groundwater in these areas. For this reason the PTM content has to be monitored to evaluate and minimize health hazards. Therefore, in this context, two areas of the SE Nile Delta subjected to 25 year of wastewater irrigation, using agricultural drainage water (ADW) and mixed wastewater (MWW) were chosen and compared with a nearby site irrigated with Nile freshwater (NFW). At each of the three sites, ten samples of irrigation water, topsoil, berseem clover (Trifolium alexandrinum L.) plants, and seven groundwater samples were collected and analyzed for Cr, Co, Cu, Pb, Ni, and Zn. Results indicate that the total contents of Co, Cu, Ni, and Zn in soils collected from the three sampling sites and Pb in the MWW-irrigated soils were higher than their average natural contents in the earth’s crust, indicating potential risks. The DTPA-extractable contents of Cu in the three sites, in addition to Pb and Zn in the MWW-irrigated soils, exceeded the safe limits. The MWW-irrigated soils showed a considerable degree of metal contamination, while the NFW- and ADW-irrigated soils showed moderate and low levels of contamination, respectively. The contents of the six PTMs in the three sites showed low individual ecological risks, except for Pb in the MWW-irrigated soils that showed a moderate risk; however, the overall ecological risk remained low in all samples. The values of Co, Cu, and Ni in berseem shoot in addition to Pb from the MWW-irrigated soils were over the maximum permissible levels for animal feeding. Values of root-to-shoot translocation factor were lower than 1.0 for Cr, Co and Ni but higher than 1.0 for Cu, Pb, and Zn. Berssem plant is a good candidate for phytofiltration of Cr, Co and Ni, while for extracting Cu, Pb and Zn from polluted soils. The groundwater samples collected from the three sampling sites showed lower metal concentrations than the safe limits for drinking standards. Further remediation studies should be taken into account to alleviate potential environmental and health-related risks when using supply resources different from freshwater.

Potentially Toxic Metals in Soil and Dominant Plants from Tonglushan Cu–Fe Deposit, Central China

2018 ◽  
Vol 102 (1) ◽  
pp. 92-97 ◽  
Author(s):  
Huang Zheng ◽  
Zezhou Zhang ◽  
Xinli Xing ◽  
Tianpeng Hu ◽  
Chengkai Qu ◽  
...  
Keyword(s):  
Toxic Metals ◽  
Central China ◽  
Potentially Toxic Metals

scholarly journals Microscopic Fungi in Big Cities: Biodiversity, Source, and Relation to Pollution by Potentially Toxic Metals

Atmosphere ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1471
Author(s):  
Maria V. Korneykova ◽  
Anastasia S. Soshina ◽  
Andrey I. Novikov ◽  
Kristina V. Ivashchenko ◽  
Olesya I. Sazonova ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Toxic Metals ◽  
Road Dust ◽  
Airborne Fungi ◽  
Potentially Toxic Metals ◽  
Opportunistic Fungi ◽  
Air Quality Assessment ◽  
Relationship Of ◽  
First Time ◽  
The Relationship

For the first time, a mycological analysis of outdoor urban environment (air, leaves, sealed surfaces) was carried in the cities of subarctic (Murmansk) and temperate (Moscow) climatic zones. The chemical composition of dust deposited on leaves of dominant tree species was taken as an indicator of the air quality. Assessment of the complex impact of factors (climate zone, type of substrate, anthropogenic load) on the quantitative and qualitative parameters of mycobiome was performed. Compared to Moscow, Murmansk was characterized by an increased number and concentrations of pollutants in the deposited dust. The number of culturable airborne fungi in Murmansk was substantially lower than in Moscow. Half of the species belonged to the opportunistic in both cities. Most dangerous opportunistic fungi were absent in the air of recreational zones but present on leaves surface and in road dust in all assessed zones of the cities. Dust chemical composition affected the diversity of fungi species. While the relationship of biological parameters with concentration of potentially toxic metals was generally negative, Cd increased the fraction of opportunistic fungi in road dust. The study revealed an importance of substrate in determining the sensitivity of outdoor mycobiome to pollution and highlighted its biological characteristics sensitive to climate.

scholarly journals Analysis of Cr(III) ions adsorption on the surface of algae: implications for the removal of heavy metal ions from water

2021 ◽  
Vol 4 (10(112)) ◽  
pp. 14-23
Author(s):  
Zhadra Tattibayeva ◽  
Sagdat Tazhibayeva ◽  
Wojciech Kujawski ◽  
Bolatkhan Zayadan ◽  
Kuanyshbek Мusabekov ◽  
...  
Keyword(s):  
Cell Surface ◽  
Metal Ions ◽  
Functional Groups ◽  
Ζ Potential ◽  
Adsorption Data ◽  
Abnormal Increase ◽  
Ph Range ◽  
Langmuir And Freundlich Models ◽  
Phosphate Groups ◽  
Comprehensive Study

For purposeful control of the adsorption process, a comprehensive study of the properties of the original cells and the effect of metal ions on them is necessary. In this regard, the features of the adsorption of Cr(III) ions on the cell surface of Spirulina platensis algae were studied. FTIR spectroscopy revealed that the main functional groups responsible for the binding of Cr(III) ions are carboxyl, hydroxyl, amino, and phosphate groups on the surface of algae. The adsorption data were processed using the Langmuir and Freundlich models. It is shown that the maximum adsorption of Cr(III) ions on the surface of algae cells is 31.25 mg/g. The Freundlich constant 1/n is 0.65. The study of the effect of the concentration of Cr(III) ions on the Zeta-potential of algae cells revealed an abnormal increase in the negative value of the ζ – potential at 10–5 mol/L, caused by the release of an additional amount of anionic functional groups to the surface. A further increase in the concentration of Cr(III) ions in the algae suspension leads to a decrease in the ζ – potential and recharge of the surface at C>10–2 mol/L. It was found that the adsorption of Cr(III) ions also affects the morphology of the cell surface. If before contact with Cr(III) ions, the surface of algae cells is represented as a uniform green grid, after adsorption of Cr(III) ions, the surface becomes green-brown, with swollen spirals. The study of the effect of pH on the adsorption and desorption processes shows an increase in the desorption of Cr(III) ions from the surface of algae during acidification of the medium. The adsorption reaches a maximum value in the pH range of 6–7. In the region of optimal Cr(III)/biosorbent ion ratios, the recovery rate of Cr(III) reaches 98.5–99.3 %.

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