scholarly journals Uptake of Radionuclides 60Co, 137Cs, and 90Sr with α-Fe2O3 and Fe3O4 Particles from Aqueous Environment

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2899
Author(s):  
Natalya V. Efimova ◽  
Alla P. Krasnopyorova ◽  
Galina D. Yuhno ◽  
Dmitry S. Sofronov ◽  
Mirosław Rucki
Keyword(s):  
Drinking Water ◽  
Aqueous Environment ◽  
High Uptake ◽  
Sorption Mechanism ◽  
Ph Values ◽  
Sorption Efficiency ◽  
Magnetite Fe3o4 ◽  
Sorption Ability ◽  
Calcium Cations ◽  
Low Costs

In the paper, investigation results of the uptake efficiency of radionuclides 60Co, 90Sr, and 137Cs dissolved in water onto iron oxides α-Fe2O3 and Fe3O4 are presented. It was found that sorption efficiency increased for higher pH values. Independent of the oxide nature, the uptake characteristics are the best toward 60Co and the worst toward 137Cs, forming the row as follows: 60Co > 90Sr > 137Cs. The highest sorption ability at pH 9 was found for magnetite Fe3O4, which was 93%, 73%, and 26% toward 60Co, 90Sr, and 137Cs, respectively, while the respective percentages for hematite α-Fe2O3 were 85%, 41%, and 18%. It was assumed that the main sorption mechanism was ion exchange. That may explain some decrease of the sorption efficiency in drinking water due to the interfering presence of magnesium and calcium cations. The obtained results indicated the feasibility of the tested sorbents and their merits, especially in terms of relatively high uptake coefficients, low costs, availability, and lack of toxicity.

Assessing the seasonal variability of shallow underground waters quality from a volcanic – sedimentary formation during El Niño event in Panama

2021 ◽  
Author(s):  
Mario Luis Miranda Montenegro ◽  
Ana Garcia ◽  
Raizha Batista ◽  
Obdulia de Montilla ◽  
Arkin Tapia ◽  
...  
Keyword(s):  
Drinking Water ◽  
El Niño ◽  
Urban Areas ◽  
El Nino ◽  
Anthropogenic Activity ◽  
Human Populations ◽  
Ph Values ◽  
El Niño Event ◽  
Geological Conditions ◽  
Groundwater Reserves

Abstract Providing drinking water to growing populations has become a worldwide concern. Therefore, in many countries some groundwater reserves are now being used to supply drinking water in remote urban areas. The state of these groundwater reserves is strongly influenced by the local geological conditions. Furthermore, climate change has caused a decrease in the periodicity of environmental conditions such as rainfalls, a key driver in replenishing these reserves. In 2019, the weak El Niño event affected the rainfall pattern, as well as physical and chemical quality of shallow ground waters in Panama. Within this study, the northwestern central region of Panama groundwaters have been systematically characterized during El Niño 2018 – 2019 event. Our results indicate that changes in values of physicochemical parameters such as alkalinity, pH and conductivity are related to changes in the amount of rainfall reported in the region starting from dry season (DS) to the rainy season (RS). Chloride was recorded as an indicator of anthropogenic activity and/or the effect of human populations on specific sites in the aquifer recharge zones. Lead (Pb2+), Zinc (Zn2+), Manganese (Mn2+), and Copper (Cu2+) concentrations in the groundwater were evaluated during the DS and RS 2019. Recorded data indicates sub – lethal concentrations of Pb2+, Zn2+, Mn2+ were associated to changes in alkalinity values of groundwater during the DS. While during the RS, a decrease in pH values favored the dissolution of Cu2+ and Zn2+. Our findings suggest that seasonal rainfall deficits modify shallow underground water alkalinity and pH values, inducing the redissolution of Pb2+, Zn2+, Mn2+, Cu 2+and exposing populations to sub – lethal concentrations of those microelements.

scholarly journals Adsorption studies of Mo and Vonto ferrihydrite

2008 ◽  
Vol 72 (1) ◽  
pp. 385-388 ◽  
Author(s):  
L. Brinza ◽  
L. G. Benning ◽  
P. J. Statham
Keyword(s):  
Binary System ◽  
Binding Sites ◽  
Point Of Zero Charge ◽  
High Uptake ◽  
Adsorption Efficiency ◽  
Adsorption Studies ◽  
Ph Values ◽  
Zero Charge ◽  
Kinetics Of

AbstractIn this paper, the kinetics of Mo and V (100 μM) uptake on ferrihydrite (FHY) were evaluated in batch, mono-sorbate systems at pH between 4 and 9, and in bi-sorbate systems in the presence of P (100 μM) at pH 7. In the Mo and V single-sorbate experiments, 100% adsorption was observed at pH values below 6 and 8, respectively. Above the point of zero charge (PZC = 7.97) of FHY, the adsorption efficiency for Mo dropped dramatically (20% at pH 8) while V showed high uptake efficiencies even at pH 9 (60% efficiency). The results from the bi-sorbate experiments (Mo-P and V-P) showed that at pH 7, P out-competed (97%) Mo for binding sites on FHY, while in the V-P binary system only ∼44% of the binding sites are occupied by P with the remaining sites being occupied by V.

scholarly journals Simultaneous Removal of Arsenate and Chromate from Ground- and Surface- Waters by Iron-Based Redox Assisted Coagulation

2020 ◽  
Vol 12 (13) ◽  
pp. 5394
Author(s):  
Asterios Laskaridis ◽  
Ioannis Sarakatsianos ◽  
Nikolaos Tzollas ◽  
Ioannis A. Katsoyiannis
Keyword(s):  
Drinking Water ◽  
Surface Waters ◽  
Natural Waters ◽  
Iron Concentration ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Matrix Composition ◽  
Ph Values ◽  
Water Matrix ◽  
Iron Based

Arsenic (As) and chromate (Cr(VI)) contamination of ground and surface waters is a major problem worldwide. Given that a new drinking water limit is anticipated for Cr(VI) and that the limit of arsenic in drinking water is quite low (10 μg/L), there is an urgent need for evaluating technologies that could be efficient for removal of both contaminants simultaneously. In this work, the use of Fe(II) redox assisted coagulation was investigated to simultaneously remove the contaminants of interest. The basic principle of this technology is that Fe(II) could react with Cr(VI) and form Fe(III)-hydroxides and insoluble Cr(III) species, while the freshly formed Fe(III) hydroxides are very efficient adsorbents for As(V). The effect of pH, the water matrix composition, Fe(II) dose, initial contaminant concentrations, NOM presence and phosphate concentration were the examined parameters. The results revealed that with a dose of 2 mg/L Fe(II), residual As(V) and Cr(VI) concentrations were both below 10 μg/L, from initial concentrations of 50 μg/L. Though, this is effective only at circumneutral pH values. This is however not a big obstacle, since most natural waters, especially groundwaters, have near neutral pH values. At these pH values, residual iron concentration was far below 200 μg/L. The presence of phosphate anions inhibited As(V) removal but had no effect on Cr(VI) removal. Increasing Fe(II) concentrations eliminated the effect of phosphate and provided simultaneous phosphate removal. Therefore, Fe(II) coagulation can be applied, with secured results, for simultaneous As(V), Cr(VI) and phosphate removal from waters.

scholarly journals An Optical Fiber Chemical Sensor for the Detection of Copper(II) in Drinking Water

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5246 ◽  
Author(s):  
Pesavento ◽  
Profumo ◽  
Merli ◽  
Cucca ◽  
Zeni ◽  
...  
Keyword(s):  
Drinking Water ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Chemical Sensor ◽  
Low Cost ◽  
Self Assembled Monolayer ◽  
Ph Values ◽  
Highly Sensitive ◽  
Selective Sensor

Highly sensitive plasmonic optical fiber platforms combined with receptors have been recently used to obtain selective sensors. A low-cost configuration can be obtained exploiting a D-shaped plastic optical fiber covered with a multilayer sensing surface. The multilayer consists of a gold film, functionalized with a specific receptor, where the surface plasmon resonance (SPR) occurs. The signal is produced by the refractive index variation occurring as a consequence of the receptor-to analyte binding. In this work, a selective sensor for copper(II) detection in drinking water, exploiting a self-assembled monolayer (SAM) of d,l-penicillamine as the sensing layer, has been developed and tested. Different concentrations of copper(II) in NaCl 0.1 M solutions at different pH values and in a real matrix (drinking water) have been considered. The results show that the sensor is able to sense copper(II) at concentrations ranging from 4 × 10-6 M to 2 × 10-4 M. The use of this optical chemical sensor is a very attractive perspective for fast, in situ and low-cost detection of Cu(II) in drinking water for human health concerns. Furthermore, the possibility of remote control is feasible as well, because optical fibers are employed.

Effects of pH and uranium concentration on the removal of uranium from drinking water by ion exchange

2000 ◽  
Vol 88 (12) ◽  
Author(s):  
K. Vaaramaa ◽  
Satu Pulli ◽  
Jukka Lehto
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Uranium Concentration ◽  
Anion Exchange Resin ◽  
Column Experiments ◽  
Strong Base ◽  
Ph Values ◽  
Effects Of Ph

Effects of pH in the range of 5 to 8 and uranium concentration in the range of 0.02 mg/l to 25 mg/l on the removal of uranium with a strong base anion exchange resin (SBA) and a chelating aminophosphonate resin were studied. The results of the batch and column mode experiments clearly showed that the aminophosphonate resin was an efficient exchanger for the removal of uranium at pH values close to 5 and the SBA resin at higher pH values. In the column experiments, where altogether 2000 bed volumes of drinking water simulant were processed with these exchangers, the uptake of uranium was as high as 99.8% by the aminophosphonate resin at pH 5 and 99.7% by the SBA resin at pH 8.

Comparative Investigations of Structure and Absorptive Capacity of Nano- and Microsized Magnetic-Operated Particles for their Application in Medicine and Biology

2009 ◽  
Vol 152-153 ◽  
pp. 403-406 ◽  
Author(s):  
Yu.G. Yanovsky ◽  
L.Kh. Komissarova ◽  
A.N. Danilin ◽  
E.I. Zaraysky
Keyword(s):  
Hepatitis B ◽  
Absorptive Capacity ◽  
Magnetic Particles ◽  
Cobalt Ferrite ◽  
Virus Hepatitis ◽  
Sorption Efficiency ◽  
Magnetite Fe3o4 ◽  
First Time ◽  
Different Molecular Weight

For the first time, the comparative investigations of structure and sorption efficiency of nano- and microsized magnetic-operated particles in respect to both the antigen and virus hepatitis B and also to the substance-markers (low-, middle- and highmolecular substances) were carried out. The sorption efficiency of magnetic particles: magnetite (Fe3O4), cobalt-ferrite (CoFe2O4), composite ferro-carbon (FeC) to the substances of different molecular weight was evaluated in vitro experiments. The high absorptive capacity to low- and highmolecular substance-markers has been observed for microsized composites of FeC. Absorptive capacity of the nanosized Fe3O4 and CoFe2O4 particles to the substance-markers was low. But the nanosized Fe3O4 and CoFe2O4 particles had a good absorptive capacity to virus of hepatitis B and its antigen (HBsAg). The sorption efficiency results of nano- and microsized magnetic particles correlate with the structure of their surface.

scholarly journals Evaluation of the Quality of Drinking Water and Rivers in the Mantaro Valley, Central Peru

2021 ◽  
Vol 943 (1) ◽  
pp. 012002
Author(s):  
A Aylas-Quispe ◽  
A Campos-Llantoy ◽  
M Perez-Cordova ◽  
C.E. Alvarez-Montalván ◽  
S. Camargo-Hinostroza
Keyword(s):  
Drinking Water ◽  
River Water ◽  
Environmental Quality ◽  
Quality Standards ◽  
Permissible Limit ◽  
Human Consumption ◽  
Ph Values ◽  
Environmental Quality Standards

Abstract The quality of river water is essential for the survival of living beings, whether for agricultural, livestock or human consumption. This study was carried out in the province of Junín, in different districts of Huancayo, the analysis of the samples was carried out in the continental university, from which the data were obtained for comparisons. This investigation revealed that the Chanchas river water has a higher concentration of pollutants during the afternoons since the pH is 8.69 (alkaline), being within the environmental quality standards, however these waters are not recommended for irrigation because it would cause plants do not absorb nutrients properly. Likewise, it was shown that the pH values of the drinking water of the four districts are similar, being 7.36, verifying that it is within the maximum permissible limit and suitable for consumption.

scholarly journals Magnetically Modified Biosorbent for Rapid Beryllium Elimination from the Aqueous Environment

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6610
Author(s):  
Michaela Tokarčíková ◽  
Oldřich Motyka ◽  
Pavlína Peikertová ◽  
Roman Gabor ◽  
Jana Seidlerová
Keyword(s):  
Low Cost ◽  
Poor Quality ◽  
Aqueous Environment ◽  
High Toxicity ◽  
Lower Content ◽  
Effective Technique ◽  
Ph Values ◽  
Modified Biochar ◽  
Optimum Ph ◽  
Modified Sorbents

Although both beryllium and its compounds display high toxicity, little attention has been focused on the removal of beryllium from wastewaters. In this research, magnetically modified biochar obtained from poor-quality wheat with two distinct FexOy contents was studied as a sorbent for the elimination of beryllium from an aqueous solution. The determined elimination efficiency was higher than 80% in both prepared composites, and the presence of FexOy did not affect the sorption properties. The experimental qmax values were determined to be 1.44 mg/g for original biochar and biochar with lower content of iron and 1.45 mg/g for the biochar with higher iron content. The optimum pH values favorable for sorption were determined to be 6. After the sorption procedure, the sorbent was still magnetically active enough to be removed from the solution by a magnet. Using magnetically modified sorbents proved to be an easy to apply, low-cost, and effective technique.

scholarly journals Enterococcus faecium of thevanAGenotype in Rural Drinking Water, Effluent, and the Aqueous Environment

2011 ◽  
Vol 78 (2) ◽  
pp. 596-598 ◽  
Author(s):  
Dearbháile Morris ◽  
Sandra Galvin ◽  
Fiona Boyle ◽  
Paul Hickey ◽  
Martina Mulligan ◽  
...  
Keyword(s):  
Drinking Water ◽  
Wastewater Treatment ◽  
Environmental Contamination ◽  
Wastewater Treatment Plant ◽  
Enterococcus Faecium ◽  
Treatment Plant ◽  
Aqueous Environment ◽  
Vancomycin Resistant Enterococci ◽  
Vancomycin Resistant ◽  
Rural Drinking Water Supply

ABSTRACTTotal enterococci and vancomycin-resistant enterococci (VRE) were enumerated in samples of effluent (n= 50) and water (n= 167) from a number of sources. VRE were detected in the outflow of a wastewater treatment plant and in a single rural drinking water supply, suggesting potential for transmission to humans through environmental contamination.

Sorption of Inorganic Substances on the Porous Latvian Clay Ceramic

2012 ◽  
Vol 51 (4) ◽  
pp. 383-388 ◽  
Author(s):  
L. Dabare ◽  
R. Svinka ◽  
V. Svinka
Keyword(s):  
Water Immersion ◽  
Mercury Porosimetry ◽  
Water Soluble ◽  
Ph Values ◽  
Inorganic Substances ◽  
Sorption Ability ◽  
Different Temperatures ◽  
Molecular Substances ◽  
Entire Amount ◽  
Clay Pellets

Devonian clay of Liepa deposit (district of Cesis) and Quaternary clay of Laza deposit (district of Aizpute) was investigated. Pellets were fired at four different temperatures of 700, 800, 900, and 1050 °C. Porosity and surface area of pellets was determined by mercury porosimetry. The pH values after water immersion of fired pellets was determined with a pHmeter. The sorption ability of molecular substance (iodine) and ionic substances (ammonia and dichromate) were determined by titrimetric methods. The best sorption ability was found for iodine molecules. The entire amount of iodine in the water suspension was absorbed in two weeks, and the sorption ability reached 12.5 mg/g for samples fired at 700 and 800 °C temperature for the Liepa clay and 13.0 mg/g for the Laza clay. The sorption ability of these clay pellets for ammonia was lower and amounted to 3.0 and 2.5 mg/g, respectively. The sorption ability for dichromate ion was even less - only 0.6 mg/g for pellets of both clays. The investigated fired porous clay granules exhibited distinct sorption properties towards water-soluble ionic and molecular substances, which depended more on the firing temperature of granules and less on the source of clay.

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