Transfer Kinetics of Amphiphilic Porphyrin between Organic Phase and Water Phase

1996 ◽  
Vol 25 (8) ◽  
pp. 605-606
Author(s):  
Tadashi Mizutani ◽  
Akihiko Tobisawa ◽  
Hisanobu Ogoshi
Keyword(s):  
Organic Phase ◽  
Water Phase ◽  
Kinetics Of

Solvothermal synthesis of tunable iron oxide nanorods and their transfer from organic phase to water phase

CrystEngComm ◽  
2014 ◽  
Vol 16 (4) ◽  
pp. 512-516 ◽  
Author(s):  
Jian-Chao Si ◽  
Yan Xing ◽  
Ming-Li Peng ◽  
Chao Zhang ◽  
Norbert Buske ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Organic Phase ◽  
Solvothermal Synthesis ◽  
Water Phase ◽  
Oxide Nanorods

scholarly journals Dose-dependent effects of isotopic exchange of tritium in the process of willow vegetation

2020 ◽  
Vol 21 (4) ◽  
pp. 354-360
Author(s):  
V.V. Dolin ◽  
◽  
V.M. Bobkov
Keyword(s):  
Organic Phase ◽  
Specific Activity ◽  
Relative Proportion ◽  
Salix Alba ◽  
Inorganic Matter ◽  
White Willow ◽  
Aquatic Food ◽  
External Water ◽  
Kinetics Of ◽  
Dose Dependent

The paper is devoted to the study of the kinetics of tritium redistribution between living and inanimate matter of white willow in the “greenhouse” experiments. It was shown that the concentration of tritium in the aquatic environment significantly affects the kinetic parameters of its assimilation in the organic and inorganic matter of the organism of the white willow (Salix alba L.). The kinetics of the influx of tritium from the aqueous nutrient into the intracellular juice, the organic phase of plants, and transpiration fumes, depending on the concentration of the superheavy hydrogen isotope, are described. Dose-dependent effects were identified, accompanied by fractionation of hydrogen isotopes in all components of the biosystem - the aquatic food environment, intracellular juice, transpiration fumes, and in the organic phase. It was found that with an increase of the initial specific activity of aqueous feeding solution (by 8.6 times): the rate of tritium removal from it and from intracellular juice increases (by 14.8 and 15.6 times, respectively), the degree of assimilation of this isotope into intracellular juice decreases (by 41.3 times), and its the part that enters the organic phase of wood (1.3 times) decreases the relative proportion of tritium in transpiration water (5.7 times). The existence of physiological barriers that sharply and significantly limit the assimilation of tritium into the components of the willow has been proved. Thus, the value of the barrier during the migration of this isotope of hydrogen into the intracellular juice reaches 15 % and only 18 - 25 % of tritium gets from the external water into the organic phase.

Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

1979 ◽  
Vol 57 (23) ◽  
pp. 3011-3016 ◽  
Author(s):  
Muhammad Fakhrul Islam ◽  
Ranjit Kumar Biswas
Keyword(s):  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Forward Rate ◽  
Nitrate Ions ◽  
Rate Determining Step ◽  
Ethyl Hexyl ◽  
Ph Range ◽  
Kinetics Of

The rate of solvent extraction of chromium(III) from aqueous sulphuric acid solutions (containing 0.05 mol dm−3 sulphate ion and 0.25 mol dm−3 acetate buffer, ionic strength, I = 0.40 mol dm−3) with bis-(2-ethyl hexyl) phosphoric acid (HDEHP or H2A2) in benzene has been measured under various conditions. The rate of backward extraction measurement of Cr(III) from organic phase to aqueous phase is not possible due to the inert property of Cr(III)–DEHP chelate. The forward rate is found to be first-order w.r.t. Cr(III) concentration in the aqueous phase and HDEHP concentration in the organic phase. The order w.r.t. H+ concentration varies from −1 to 1 over the pH range 1.5 to 5.25. The rate is found to decrease with increasing sulphate and nitrate ions concentrations in the aqueous phase. At (30 ± 1) °C, the rate expression, in the presence of sulphate, acetate, and nitrate ions, is found to be represented by:[Formula: see text]In the absence of the anions, the formation of CrHA22+ intermediate complex (Cr(OH)2+ + H2A2(0) → CrHA22+ + H2O) is the rate determining step at all acidities. The effects of the anions on the rate are discussed.

scholarly journals PENGARUH PERBANDINGAN VOLUME FASA AIRDENGAN FASA ORGANIK DAN KONSENTRASI AgDALAMFASA AIR PADA EKSTRAKSI PERAKDARI LIMBAH FOTO ROENTGEN

2016 ◽  
Vol 4 (1) ◽  
pp. 41
Author(s):  
Minasari Minasari ◽  
Yeti Kurniasih ◽  
Ahmadi Ahmadi
Keyword(s):  
Optimum Condition ◽  
Organic Phase ◽  
Metal Ion ◽  
Research Result ◽  
Ion Concentration ◽  
Phase Ratio ◽  
Water Phase ◽  
Extraction Percentage ◽  
Silver Extraction ◽  
Silver Metal

Roentgen photo waste containing silver metal ion (Ag+) in form of silver thiosulfic complex ([Ag(S2O3)2]3-) that danger for health and environment. To prevent contamination to environment by silver metal from roentgen photo waste, separation become need to do. Solvent extraction was one of available separation technique on this case. The aim of this research was to evaluate the influence of few extraction parameters that was water-organic phase ratio and Ag concentration on water phase to silver extraction percentage, and apply optimum condition to roentgen photo waste sample. Silver extraction was applied on various water-organic phase ratios, there were 5 : 10; 10 : 10; 25 : 10; 50 : 10; and 75 : 10 mL and various silver concentration on water phase, there were 10, 20, 30, and 40 ppm. Ag+ ion concentration was measured by AAS in 328.22 nm wavelength before and after extraction process, than calculation of silver extraction percentage could be conducted. Based on research result, optimum condition of silver extraction was obtained on 1 : 2 of water-organic phase ratio and 10 ppm of Ag concentration on water phase. 10,27 % silver extraction was obtained on application of optimum extraction condition on roentgen photo waste.

scholarly journals Determination of micro-quantities of magnesium.

1962 ◽  
Vol 10 (2) ◽  
pp. 154-156
Author(s):  
J.C. Van Schouwenburg ◽  
I. Walinga
Keyword(s):  
Boric Acid ◽  
Organic Phase ◽  
Water Phase ◽  
Reagent Blank ◽  
Acid Buffer

To 25 ml or less of a neutral sample (containing up to 20 gamma Mg) in a 150ml separating funnel, 10 ml tartrate solution, 10 ml boric-acid buffer and 5 ml Na diethyldithiocarbamate are added and the solution made up to 50 ml. After extracting with 25 ml chloroform and discarding the organic phase the water phase is rinsed with about 10 ml chloroform and the organic phase again discarded. 10 ml of masking agent, 1 ml n-butylamine and 10 ml extracting solution (8-hydroxyquinoline in chloroform) are then added. After shaking and separating the organic phase a knife point of Na2SO4 is added and the extinction of the samples and that of a l0 gamma Mg standard are measured against a simultaneously treated reagent blank at 380 nm. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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