Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "anion" wg kryterium: Temat


Tytuł:
Effects of $Ca{2+}$ and $SO_4^{2-}$ ions on fluorite flotation
Autorzy:
Xun, Luobing
Hu, Jiacheng
Shi, Qing
Zhang, Guofan
Powiązania:
https://bibliotekanauki.pl/articles/1448205.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorite
flotation
calcium cation
sulphate anion
Opis:
The effects of $Ca^{2+}$ and $SO_4^{2-}$ on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of $SO_4^{2-}$ and $Ca^{2+}$ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of $SO_4^{2-}$ on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more $SO_4^{2-}$ are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 2; 95-104
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sunset Yellow sorption on weak base anion exchanger — kinetic and equilibrium studies
Autorzy:
Wawrzkiewicz, M.
Wołowicz, A.
Greluk, M.
Hubicki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/115804.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
dye
anion exchanger
adsorption
kinetics
Opis:
The sorption equilibrium and kinetics of Sunset Yellow dye in aqueous solutions on the weak base anion exchange resin — Amberlite FPA51 were examined in this paper. The influences of phase contact time, solution pH, initial dye concentration and temperature were studied by the batch method. The amounts of dye sorbed at equilibrium changed from 9.9 to 48.7 mg/g with the increasing initial concentrations in the range 100–500 mg/L. The experimental data were analyzed by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models of adsorption. The maximum monolayer capacity was 130.6 mg/g. The sorption free energy was equal to 14.6 kJ/mol and revealed the nature of the ion exchange mechanism in this system. The kinetic data were modelled using the pseudo-first order, pseudo-second order and intraparticle diffusion equations.
Źródło:
Challenges of Modern Technology; 2011, 2, 2; 66-70
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Usuwanie bromianów z roztworów wodnych w membranowym procesie wymiany anionowej
Removal of bromates from aqueous solutions by anion exchange in a membrane process
Autorzy:
Wiśniewski, J.
Kliber, S.
Powiązania:
https://bibliotekanauki.pl/articles/236562.pdf
Data publikacji:
2009
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
wymiana anionowa
membrana anionowymienna
bromiany
azotany
anion exchange
anion-exchange membrane
bromates
nitrates
bicarbonates
Opis:
Przedstawiono wyniki badań nad usuwaniem bromianów z roztworów wodnych w membranowym procesie wymiany anionowej. Proces dializy Donnana przeprowadzono w laboratoryjnej instalacji do dializy (Goemasep 136) wyposażonej w 20 par komór z membranami anionowymiennymi Selemion AMV, Neosepta AFN i Neosepta ACS. Największą skuteczność usuwania bromianów - 89% i 100% - uzyskano stosując membranę Selemion AMV, odpowiednio przy stężeniach NaCl w roztworze odbierającym 200 mol/m3 i 300 mol/m3. Zaobserwowano, że proces wymiany anionów przy użyciu membrany Neosepta AFN (charakteryzującej się luźną strukturą) przebiegał z większą szybkością, lecz skuteczność usuwania bromianów była mniejsza. Zastosowanie w procesie wymiany anionów membrany Neosepta ACS (o zwartej strukturze powierzchniowej) spowodowało, że zarówno szybkość, jak i skuteczność usuwania anionów (w tym bromianów) były najmniejsze spośród badanych membran. Wykazano, że proces wymiany anionowej na membranach anionowymiennych umożliwił skuteczne usunięcie z wody szkodliwych bromianów i azotanów i zastąpienie ich jonami neutralnymi (chlorkami). Szybkość i skuteczność usuwania anionów z wody w tym procesie zależała m.in. od rodzaju membrany anionowymiennej i stężenia NaCl w roztworze odbierającym.
The objective of the study was the removal of bromates from water solutions by an anion-exchange membrane process. Donnan dialysis was conducted in a laboratory dialytic set-up (Goemasep 136) equipped with 20 cell pairs and three types of anion-exchange membranes: Selemion AMV, Neosepta AFN or Neosepta ACS. The highest efficiencies of bromate removal, 89% and 100%, were obtained with Selemion AMV, at NaCl concentrations in the receiving solution amounting to 200 mol/m3 and 300 mol/m3, respectively. It has been observed that when use was made of the Neosepta AFN membrane (characterized by a loose structure), anion exchange proceeded at a faster rate as compared to the other membranes tested, but the efficiency of bromate removal was lower. The application of the Neosepta ACS membrane (of a dense surface structure) produced the lowest values of both rate and efficiency of anion removal (including those for bromates). It has been demonstrated that the process of anion exchange conducted with anion-exchange membranes not only brought about a highly efficient removal of the harmful bromates and nitrates from the water, but also enabled their substitution with neutral ions (chlorides). The rate and efficiency with which the anions were removed during the process depended, inter alia, on the type of the anion-exchange membrane and the concentration of NaCl in the receiver.
Źródło:
Ochrona Środowiska; 2009, 31, 2; 35-39
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an electrochemical method for the measurement of antioxidant capacity of pure compounds and natural substances extracts
Autorzy:
Lanez, T.
Rebiai, A.
Powiązania:
https://bibliotekanauki.pl/articles/411914.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
antioxidant activity
superoxide anion radical
electrochemistry
DDPH
Opis:
A new method has been developed to measure total antioxidant activity of antioxidants in foods and natural substances without use of standard antioxidants and without use of calibration curves plotting. It is based on measuring the oxidation peak current of superoxide anion radical electrochemically generated by reduction of commercial molecular oxygen in dimethylformamide. The method has been validated using 7 known standard antioxidants and the results have been compared with those obtained by the DPPH and molybdate ion reduction assays. Measured antioxidant capacities were highly correlated with those obtained using DPPH (r2 = 0.549) and molybdate ion reduction assay (r2 = 0.434).
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 1; 46-54
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A near-infrared fluorescent probe for selective detection of fluorion
Autorzy:
Kang, Yan-Fei
Wei, Fan
Meng, Ya-Li
Xin, Zhen-Hui
Wei, Dong
Powiązania:
https://bibliotekanauki.pl/articles/778367.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Probe
Fluorescence
Fluoride anion
Selectivity
Near-infrared
Opis:
In this work, we have designed and synthesized the fluorescent probe 1, which was capable to selectively detect fluoride anion (F). More importantly, the probe 1 possessed near-infrared excitation and emission wavelengths (excitation at 650 nm and emission at 695), and the probe solution had changed dramatically from yellow to cyan with the addition of F. In addition, the fluorescence intensity exhibited perfectly positive correlation with concentration of F concentration from 0 to 40 μM (R2 = 0.9972), which offered the important condition for quantitative analysis. The probe 1 owned detection limit of 46 nM. Therefore, this near-infrared probe can be of great benefit for detecting F in practical application.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 1; 1-5
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of weakly basic anion exchanger for removal of Remazol Black B
Autorzy:
Greluk, M.
Hubicki, Z.
Wawrzkiewicz, M.
Wołowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/115782.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
Remazol Black B
anion exchanger
sorption
Opis:
The weakly basic anion exchangers of the functional tertiary amine gropus with the polystyrene skeleton: Amberlyst A-21 and with acrylic skeleton: Amberlite IRA-67 were investigated as adsorbents of Remazol Black B from aqueous solutions. Experiments were carried out as function of contact time (1–240 min.), initial dye concentration (50–500 mg/dm3), pH (1–12), temperature (298–318 K) and ionic strength (NaCl). The results indicate that the investigated anion exhchangers are suitab;e as adsorbent material of Remazol Black B from aqueous solutions
Źródło:
Challenges of Modern Technology; 2011, 2, 3; 29-33
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leakage of mono- and divalent cations through the weak-base anion exchange membrane in the process of electrodialysis of H2SO4 and its metal salt mixture
Autorzy:
Kultys, M.
Koter, S.
Gilewicz-Łukasik, B.
Koter, I.
Powiązania:
https://bibliotekanauki.pl/articles/347031.pdf
Data publikacji:
2011
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
anion-exchange membrane
electrodialysis
metal cation leakage
sulfuric acid
Opis:
Experimental results on the separation of sulfuric acid from its mixture with sodium- and magnesium sulfate, respectively, by the electrodialytic method have been presented. The Selemion AVV membrane as anion-exchange membrane was used. It was found that the leakage of Na+ from the cathode to the anode side of the AAV was higher than that of Mg2+. The leakage of Na+ decreased with the acid concentration whereas that of Mg2+ increased. Surprisingly enough, the permeability of Na+ increased with the electric current density, indicating a substantial contribution of electroosmotic convection to the Na+ flow. The current efficiency of the anions transport (HSO4 -, SO4 2-) through the AAV hardly exceeded 50%. It was independent of the kind of salt present on the cathode side of the AAV.
Źródło:
Ars Separatoria Acta; 2011, 8; 101-108
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the Efficiency of Ammonia Oxidation in Anolyte of Two-Chamber Electrolyzer
Autorzy:
Gomelya, Mykola
Shabliy, Tetyana
Radovenchyk, Iaroslav
Overchenko, Tetyana
Halysh, Vita
Powiązania:
https://bibliotekanauki.pl/articles/123631.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ammonia
electrolysis
anolyte
catholyte
anion exchange membrane MA-41
Opis:
In this study, the processes of electrochemical oxidation of ammonia in a two-chamber electrolyzer with anion exchange membrane MA-41 were investigated. An estimation of the efficiency of the process of oxidation of ammonia, depending on the chemical composition of the initial solution of anolyte and catholyte, current density and time of electrolysis was carried out. It was shown that the oxidation of ammonia in the anode chamber passes quickly and is accompanied by a significant decrease in pH due to the formation of nitrogen dioxide and nitrates. At the same time, the current output and the electrical conductivity of the dilute solutions was rather low. The effect of chlorides on the process of electrolysis was investigated. It was shown that the presence of chlorides in the anolyte catalyzes the processes of oxidation of ammonia. An increase in the concentration of chlorides in the anolyte increases output and reduces electricity consumption. The presence of chlorides in the catholyte does not accelerate oxidation. The presence of sulfates, both in the anolyte and in the catholyte, slows down the process of oxidation of ammonia as a result of the oxidation of sulfates to persulfates, which are quite passive to ammonium ions. At the same time, electricity consumption increases.
Źródło:
Journal of Ecological Engineering; 2019, 20, 5; 121-129
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of sulfide anion in the development of chronic alcoholic hepatitis under the conditions of modulation of adenosine monophosphate kinase – a correlational study
Autorzy:
Mykytenko, Andrii
Akimov, Oleh
Shevchenko, Oleksandr
Neporada, Karine
Powiązania:
https://bibliotekanauki.pl/articles/29519432.pdf
Data publikacji:
2023-09-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
AMPK
chronic alcohol hepatitis
doxorubicin
liver
phenformin
sulfide anion
Opis:
Introduction and aim. Hydrogen sulfide (H2S) has attracted the attention of researchers as a novel signaling molecule that affects vascular metabolism, immune function, stress and inflammation. It plays an important role in pathophysiological disorders under the conditions of the development of obesity, diabetes, non-alcoholic fatty liver disease and cardiovascular diseases. The purpose of this work is to establish correlation ratios of H2S concentration with markers of oxidative-nitrosative stress and extracellular matrix metabolism of the liver during chronic alcoholic hepatitis modeling and AMPK modulation by phenformin and doxorubicin. Material and methods. The experiments were performed on 36 white, sexually mature male Wistar rats, weighing 180-220 g. Alcoholic hepatitis was modelled by alcohol administration, on the background of alcoholic hepatitis animals received phenformin orally at a dose of 10 mg/kg or doxorubicin at a dose of 1.25 mg/kg intraperitoneally. Statistical processing of the results of biochemical studies was carried out using the non-parametric method of Spearman to determine correlations. Results. H2S during alcoholic hepatitis inversely proportionally strongly correlates with the concentration of nitrites, oxyproline and arginase activity. Phenformin administration during alcoholic hepatitis leads to formation of inversely proportionally strongly correlation of H2S with the production of superoxide anion radical, the concentration of malondialdehyde, activities of constitutive NO-synthases, nitrite reductases, nitrate reductases, and arginase. Doxorubicin administration during alcoholic hepatitis leads to formation of directly proportional strongly correlation of H2S with the activity of constitutive NO-synthases, nitrite reductases, nitrate reductases. Conclusion. Administration of phenformin or doxorubicin expands correlations between H2S and indicators of oxidative-nitrosative stress.
Źródło:
European Journal of Clinical and Experimental Medicine; 2023, 3; 567-575
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie procesu wymiany jonowej do usuwania naturalnych substancji organicznych z wody
Application of ion exchange to natural organic matter removal from water
Autorzy:
Kabsch-Korbutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/236744.pdf
Data publikacji:
2013
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
humic substances
anion exchange resin
substancje humusowe
żywica anionowymienna
MIEX®
Opis:
Omówiono zastosowanie procesu wymiany jonowej do usuwania z wody naturalnych makrocząsteczek organicznych. Możliwość ta wynika z faktu, iż znaczna część naturalnych substancji organicznych ma charakter makroanionów i stąd mogą być one usuwane na żywicach anionowymiennych. Także frakcja związków organicznych pozbawiona ładunku elektrycznego może zostać usunięta z wody wyniku adsorpcji na jonitach. Wykazano, że o skuteczności usuwania naturalnych substancji organicznych decydują m.in. właściwości fizyczno-chemiczne oczyszczanej wody, właściwości stosowanej żywicy oraz sposób realizacji procesu wymiany jonowej. Korzyści wynikające z wykorzystania wymiany jonowej do usuwania makrocząsteczek organicznych z wody to – oprócz bardzo wysokiej skuteczności – także minimalne wtórne zanieczyszczenie wody oraz bardzo niewielkie ilości odpadów wymagających zagospodarowania. Dodatkowo, coraz częstsze stosowanie tej techniki w układach oczyszczania wody wynika z faktu, iż koszty inwestycyjne i eksploatacyjne procesu wymiany jonowej są porównywalne do kosztów równie skutecznych metod oczyszczania wody ze związków organicznych, np. nanofiltracji lub adsorpcji na węglu aktywnym.
Application of ion exchange process to removal of natural organic matter (NOM) from water was discussed. The majority of natural organic particles show properties of macroions and therefore they may be removed using anion exchange resins. Also, the fraction of organic compounds lacking electric charge may be removed from water using ion exchange adsorption. It was proved that efficiency of NOM removal depends, among others, on the physicochemical properties of water being purified, type and properties of the resin used as well as on the ion exchange method. The advantages of ion exchange process application to NOM separation from water include, apart from very high efficiency, minimum secondary water contamination and low amount of wastes to be disposed. Additionally, an increasing popularity of ion exchange in drinking water treatment results from investment and operating costs being comparable to costs of equally effective water treatment processes like nanofiltration or activated carbon adsorption.
Źródło:
Ochrona Środowiska; 2013, 35, 1; 11-18
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regeneracja żywic jonowymiennych stosowanych do separacji anionowych substancji powierzchniowo czynnych z roztworów wodnych
Regeneration of ion-exchange resins used for the separation of anionic surfactants from aqueous solutions
Autorzy:
Kowalska, I.
Powiązania:
https://bibliotekanauki.pl/articles/236840.pdf
Data publikacji:
2012
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
surfaktant anionowy
żywica anionowymienna
regeneracja
anionic surfactant
anion-exchange resin
regeneration
Opis:
Określono skuteczność regeneracji makroporowatych i żelowych żywic jonowymiennych (MIEXŽ, A100, A200, A400 i SBW) wysyconych w układzie przepływowym anionową substancją powierzchniowo czynną. W badaniach zastosowano modelowy roztwór dodecylobenzenosulfonianu sodu (SDBS) o stężeniu 400 g/m3. Regenerację żywic w układach przepływowym i porcjowym przeprowadzono 12% roztworem NaCl (MIEXŽ) i 4% roztworem NaOH (A100, A200, A400 i SBW). Wykazano, że skuteczność regeneracji żywic jonowymiennych zależała od rodzaju polimeru, przy czym odmycie SDBS malało wraz ze zmniejszaniem się wielkości ziaren jonitu oraz stopnia usieciowania polimeru w szeregu MIEXŽ>A100>SBW>A200>A400. Regeneracja żywic przeprowadzona w układach przepływowym i porcjowym charakteryzowała się podobną skutecznością odmywania SDBS, przy ok. 50% większym zużyciu roztworów regeneracyjnych w układzie porcjowym.
Effectiveness of regeneration was determined for macroporous and gel ion-exchange resins (MIEXŽ, A100, A200, A400 and SBW) saturated with an anionic surfactant in a continuous system. Use was made of a sodium dodecylbenzenesulfonate (SDBS) model solution at a concentration of 400 g/m3. Regeneration was carried out in a column and in a batch system with 12% NaCl solution (MIEXŽ) and 4% NaOH solution (A100, A200, A400 and SBW). The study produced the following findings. The extent of regeneration was influenced by the type of the resin applied. The level of SDBS elution decreased with decreasing grain size and degree of polymer cross-linking in the following order: MIEXŽ>A100>SBW>A200>A400. Regardless of whether the regeneration process was carried out in a column or a batch system, elution of SDBS was much the same, with approximately 50% greater consumption of regenerative solutions for the batch system.
Źródło:
Ochrona Środowiska; 2012, 34, 2; 39-42
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radioisotopic tracer technique for characterization of nuclear and non-nuclear grade ion exchange resins Tulsion A-23 and Indion-810
Autorzy:
Singare, P. U.
Powiązania:
https://bibliotekanauki.pl/articles/412106.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
anion exchange resins
radiotracer isotopes
Tulsion A-23
Indion-810
characterization
Opis:
In the present paper 82Br radioactive tracer isotopes was used for characterization of nuclear and non-nuclear grade ion exchange resins Tulsion A-23 and Indion-810 respectively. The bromide ion-isotopic exchange reactions were performed by equilibrating 1.000 g of conditioned resins in bromide form with labeled bromide ion solution of different concentrations ranging from 0.001 M to 0.004 M, in the temperature range of 30.0 °C to 45.0 °C. The resins were characterized by comparing the values of specific reaction rate (min-1), amount of bromide ion exchanged (mmol) and percentage of bromide ions exchanged under identical experimental conditions. It was observed that the above values decrease with rise in temperature and increases with increase in concentration of labeled bromide ion solution. From the experimental values of specific reaction rate, amount and percentage of bromide ions exchanged, it was observed that Tulsion A-23 resins are superior to Indion-810 resins under identical experimental conditions.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 6; 1-5
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of acid, direct and reactive dyes on thepolyacrylic anion exchanger
Autorzy:
Polska-Adach, Ewelina
Wawrzkiewicz, Monika
Hubicki, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/110859.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dye removal
polyacrylic anion exchanger
reactive dye
direct dye
acidic dye
Opis:
In the present studythe polyacrylic anion exchanger Amberlite IRA 478 (IRA 478) was used forremoval of textile dyes such as C.I. Acid Red 18 (AR18), C.I. Reactive Blue 21 (RB21) and C.I. Direct Yellow 142 (DY142) from aqueous solutions. Sorption of the above-mentioned dyes was carried out by the static and dynamic methods. The obtained results were analyzed by determining the adsorption isothermparameters using the Langmuir and Freundlichmodels. Kinetic parameters of dyessorption were calculated from the pseudo-first order, pseudo-second order and intraparticle diffusion models. The monolayer sorption capacities of IRA 478 determined from the Langmuir isotherm were found to be 1098.5 mg/g for AR18 (R2=0.994), 46.8 mg/g for DY142 (R2=0.820) and 23.5 mg/g for RB21 (R2=0.987).Kinetic studies revealed that effectiveness of AR18, DY142 and RB21 uptakeincreases with increasing phase contact time and initial dyesconcentration.The kinetics of the dyessorption process on the anion exchanger is best described by the pseudo-second order model (PSO) due to the high values of the determination coefficients R2 (linearity condition of the plot t/qt vs.t). The rate constantsof the pseudo-second order kinetics k2are reduced from 0.1001 to 0.0008 g/mg·min for AR18, from 0.0147 to 0.0112 g/mg·min for DY142 and 0.0489 to 0.0072 g/mg·min for RB21 with an increase of initial concentration of dyes.The presence of salts and surfactants had an impact on the retention of direct and reactive dyes.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1496-1508
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agronomic evaluation of irrigation water on the Southern Buh and Kamianska irrigation systems
Autorzy:
Chornyy, Sergiy
Isaiva, Vera
Powiązania:
https://bibliotekanauki.pl/articles/2174351.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
bicarbonate
chlorine anion
electrical conductivity
irrigation water
salt content
sodium cation
Opis:
The aim of the research was to study the temporal and spatial dynamics of a set of agronomic criteria for irrigation water in the process of transporting it from the Southern Buh River intake site to the lands of the Southern Buh and Kamianska irrigation systems situated in southern Ukraine. Six stationary research sites for monitoring the quality of irrigation water were established along the route of irrigation water transportation. Determination of agronomic criteria for irrigation water quality was carried out in two terms: at the beginning of the irrigation season, in May, and at the end, in September. The content of cations of sodium, magnesium, calcium, and anions of chlorine, sulphates, carbonates, and bicarbonates was determined. In the field, the pH and electrical conductivity of water, the total salt content, and the total amount of dissolved solids were determined. It is determined that waters have an average level of danger from the point of view of salinisation of soils. This fact leads to a decrease in yield of sensitive to salinity crops (corn, alfalfa and most vegetables). The high content of sodium cations along with the low content of calcium and magnesium cations indicates the danger of degradation of the physical properties of the southern chernozems and the need to use the meliorants containing calcium. There is a high probability of toxic effects on crops caused by sodium cations. At the same time, it is stated that there is no negative effect of chlorine anions on plants.
Źródło:
Journal of Water and Land Development; 2022, 54; 77--83
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silver ion selective electrode based on (2-pyridylmethoxy)-p-t-octylcalix[4]arene
Autorzy:
Higuchi, H.
Shinohara, T.
Oshima, T.
Ohto, K.
Inoue, K.
Powiązania:
https://bibliotekanauki.pl/articles/346967.pdf
Data publikacji:
2002
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
ion-selective electrode
calix[4]arene
selectivity coefficient
anion effect
Opis:
Calix[4]arene bearing pyridyl group at lower-rim has been used as an ionophore for silver ion-selective electrode. The electrode membranes containing different amount of potassium tetrakis(p-chlorophenyl)borate (KTpClPB) were prepared to investigate the influence of KTpClPB on potential response. The response behavior for membranes depends on the amount of KTpClPB and dramatically changes from anion to cation response. The membrane containing 135 mol % with respect to ionophore gives linear response to Ag+ in the concentration range from 10-5.5 to 10-2 M AgNO3.
Źródło:
Ars Separatoria Acta; 2002, 1; 99-103
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies