Extraction of Zn(II) and Cd(II) with anthranilic acid in the presence of nitrogen-containing organic bases

1980 ◽  
Vol 58 (15) ◽  
pp. 1558-1561 ◽  
Author(s):  
Bina Jain ◽  
J. M. Singh ◽  
R. N. Goyal ◽  
S. N. Tandon
Keyword(s):  
Synergistic Effect ◽  
Anthranilic Acid ◽  
Polar Solvents ◽  
Organic Bases ◽  
Extraction Constants ◽  
Coordinated Water ◽  
Ph Range

Zinc and cadmium anthranilates do not extract into non-polar solvents alone in the pH range 4.5–6.5. But their extraction is synergistically enhanced in presence of N bases, apparently by displacement of coordinated water. The synergistic effect varies with the bases in the order β-picoline > pyridine > quinoline. The values of extraction constants suggest that cadmium forms more stable complexes than zinc.

Extraction of cadmium salicylate with some nitrogen-containing organic bases

1978 ◽  
Vol 56 (23) ◽  
pp. 2922-2926 ◽  
Author(s):  
J. M. Singh ◽  
S. N. Tandon
Keyword(s):  
Synergistic Effect ◽  
Aqueous Solutions ◽  
Experimental Conditions ◽  
Organic Bases ◽  
Distribution Constants ◽  
Coordinated Water

Cd(HSal)2 is extracted from aqueous solutions into n-butanol, but not into non-hydroxylic solvents (such as benzene and chloroform) at pH 4.5 to 6.0. Addition of N bases, which have no effect alone, causes extraction into the latter solvents, apparently by displacement of coordinated water, giving Cd(HSal)2•2B. This synergistic effect varies with B (β-picoline > pyridine > quinoline). Formation and distribution constants are given for the experimental conditions.

Examination of the Conditions of Extraction of Toxic Organic Bases and of Methods of Their Determination. III. Extraction of Ion-Associates of Dibenz[b,f]-1,4-oxazepin

1994 ◽  
Vol 59 (3) ◽  
pp. 582-588
Author(s):  
Jan Souček ◽  
Ladislav Belický ◽  
Josef Havel
Keyword(s):  
Aqueous Phase ◽  
Basic Dye ◽  
Organic Bases ◽  
Safranine T ◽  
Extraction Constants ◽  
Distribution Constants

The protonation and distribution constants of dibenz[b, f]-1,4-oxazepin (CR) were measured. This substance forms stable ion-associates with Acid Red 88, extractable into chloroform. Reextraction with an aqueous phase containing basic fuchsine or safranine T brings about exchange of the CR cation for the basic dye cation. The associates so formed exhibit higher conditional extraction constants and higher molar absorptivities than the initial associates.

Deflocculation of Alumina Suspensions Using Polyelectrolyte Dispersants

2007 ◽  
Vol 352 ◽  
pp. 81-84
Author(s):  
Yang Qiao Liu ◽  
Lian Gao
Keyword(s):  
Acrylic Acid ◽  
Zeta Potential ◽  
Synergistic Effect ◽  
Surface Charge ◽  
Functional Groups ◽  
Ph Value ◽  
Rheological Measurements ◽  
Gel Casting ◽  
Ph Range ◽  
Poly Acrylic Acid

In this paper, the dispersing abilities of three polyelectrolytes, poly (acrylic acid), poly (acrylic acid-co-acrylate), and a four-member copolymer containing various anionic functional groups were tested for aqueous Al2O3 suspensions. The influence of the dispersants on the surface charge of the powder was evaluated by measuring the zeta potential in dilute Al2O3 suspensions. It was found that all the three dispersants shifted the isoelectric point to a lower pH value. Rheological measurements showed that the four-member dispersant decreased the viscosity in the widest pH range, which should be ascribed to the synergistic effect of different functional groups. The 58vol% concentrated Al2O3 slurry using the four-member dispersant was further consolidated using gel casting and was fully sintered at 1600oC.

Extraction of Selected Organic Bases from Water into Chloroform by Means of the Cobaltacarborane Anion

1998 ◽  
Vol 63 (7) ◽  
pp. 967-976 ◽  
Author(s):  
Oldřich Navrátil ◽  
Zdeněk Skaličan ◽  
Zbyněk Kobliha ◽  
Emil Halámek
Keyword(s):  
Solvent Extraction ◽  
Aqueous Phase ◽  
Organic Nitrogen ◽  
Base Cations ◽  
Photometric Determination ◽  
Nitrogen Base ◽  
Organic Bases ◽  
Quaternary Salts ◽  
Extraction Constants

The cobaltacarborane anion labelled with 60Co was used to study the solvent extraction and stability of its ion associates with a series of organic nitrogen base cations or quaternary salts, some of which are psychoactive. The aqueous phase was 0.1 M HCl, the organic phase was chloroform. The extraction constants of the ion associates were calculated. A method was devised for competitive extraction of ion associates with additional dye anions which are used in the extraction-photometric determination of selected bases.

scholarly journals Kinetics and Mechanism of the Decarboxylation of Pyrrole-2-carboxylic Acid in Aqueous Solution

1971 ◽  
Vol 49 (7) ◽  
pp. 1032-1035 ◽  
Author(s):  
G. E. Dunn ◽  
Gordon K. J . Lee
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Carboxylic Acid ◽  
Isotope Effect ◽  
Anthranilic Acid ◽  
Kinetic Isotope Effect ◽  
Pyrrole Ring ◽  
First Order ◽  
Kinetic Isotope ◽  
Ph Range

The decarboxylation of pyrrole-2-carboxylic acid in aqueous buffers at 50° and ionic strength 1.0 has been found to be first order with respect to substrate at a fixed pH. As the pH is decreased, the rate constant increases slightly in the pH range 3–1, then rises rapidly from pH 1 to 10 M HCl. The 13C-carboxyl kinetic isotope effect is 2.8% in 4 M HClO4 and negligible at pH ~ 3. These observations can be accounted for by a mechanism, previously proposed for the decarboxylation of anthranilic acid, in which the species undergoing decarboxylation is the carboxylate ion protonated at the 2-position of the pyrrole ring. This intermediate can be formed both by ring-protonation of the carboxylate anion and by ionization of the ring-protonated acid. At low acidities ring-protonation is rate determining, but at higher acidities the rate of protonation exceeds that of decarboxylation.

Water assisted formation of highly oriented CsPbI2Br perovskite films with the solar cell efficiency exceeding 16%

2020 ◽  
Vol 8 (34) ◽  
pp. 17670-17674 ◽  
Author(s):  
Ze Qing Lin ◽  
Hong Wei Qiao ◽  
Zi Ren Zhou ◽  
Yu Hou ◽  
Xiaolong Li ◽  
...  
Keyword(s):  
Solar Cell ◽  
Synergistic Effect ◽  
Polar Solvents ◽  
Solar Cell Efficiency ◽  
Cell Efficiency

Oriented, large grain-sized CsPbI2Br perovskite films with a solar cell efficiency over 16% were achieved via a synergistic effect of strong polar solvents.

scholarly journals Synergistic degradation of PNP via coupling H2O2 with persulfate catalyzed by nano zero valent iron

RSC Advances ◽  
2019 ◽  
Vol 9 (35) ◽  
pp. 20323-20331 ◽  
Author(s):  
Jiangkun Du ◽  
Yang Wang ◽  
Faheem Faheem ◽  
Tiantian Xu ◽  
Han Zheng ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Zero Valent Iron ◽  
Sulfate Radicals ◽  
Initial Ph ◽  
Nano Zero Valent Iron ◽  
Simultaneous Activation ◽  
Synergistic Degradation ◽  
Ph Range

Simultaneous activation of H2O2 and persulfate by nanoscaled Fe0 shows synergistic effect for degradation of p-nitrophenol with generating both hydroxyl and sulfate radicals in a wide initial pH range.

Mechanism of decarboxylation of substituted anthranilic acids at high acidity

1970 ◽  
Vol 48 (21) ◽  
pp. 3349-3353 ◽  
Author(s):  
G. E. Dunn ◽  
S. K. Dayal
Keyword(s):  
Sulfuric Acid ◽  
Anthranilic Acid ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Carboxyl Group ◽  
Kinetic Isotope ◽  
Anthranilic Acids ◽  
Ph Range ◽  
Solvent Isotope ◽  
Solvent Isotope Effects

The rates of decarboxylation of 4-methyl-, 4-methoxy-, and unsubstituted anthranilic acids have been determined in aqueous buffers over the pH range 2.5–3.8. Electron-releasing substituents increase the rates of ring-protonation about equally for an acid and its anion, and decrease the ratio of decarboxylation to deprotonation of the protonated acid. Rates, 13C-carboxyl kinetic isotope effects, and deuterium solvent isotope effects have been determined for the decarboxylation of anthranilic acid in aqueous sulfuric acid up to 10 M. No evidence for decarboxylation by cleavage of the unionized carboxyl group was obtained.

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