The change in the absorption spectra of ascorbic acid solutions, depending on their acidity

By fixing Quantum Dots (QDs) on gold electrodes with dithiol compounds, a novel Ascorbic Acid sensor without any redox mediator was desighed. First, the fabrication process of sensor was described.Sencond, the characteristics of the sensor were investigated. Third,the sensor was tested in Ascorbic Acid solutions of different concentrations.From the results,it shows that the performance of photoelectrochemical sensor were influenced by the bias voltage and the amplitude of photocurrent changed with the Ascorbic Acid concentration linearly in detection range.

Download Full-text

Electrochemical behavior of tin anode in ascorbic acid solutions

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2018.05.040 ◽

2018 ◽

Vol 215 ◽

pp. 332-338 ◽

Cited By ~ 4

Author(s):

Nobl F. El Boraei ◽

Sayed S. Abd El Rehim

Keyword(s):

Ascorbic Acid ◽

Electrochemical Behavior ◽

Acid Solutions ◽

Tin Anode

Download Full-text

Diffusion measurements in aqueous L-ascorbic acid solutions

Australian Journal of Chemistry ◽

10.1071/ch9801857 ◽

1980 ◽

Vol 33 (8) ◽

pp. 1857 ◽

Cited By ~ 5

Author(s):

M Shamim ◽

SMA Baki

Keyword(s):

Ascorbic Acid ◽

Diffusion Coefficient ◽

Diffusion Coefficients ◽

Molecular Form ◽

Acid Solutions ◽

Acid Molecule ◽

Diaphragm Cell ◽

Solvent Molecules

Diffusion coefficients in aqueous 0.05-1.0 M L-ascorbic acid solutions have been measured at 298.15 K by using a modified version of the Stokes diaphragm cell. The diffusion coefficient of un-ionized ascorbic acid molecule at zero concentration has been found to be 1.055 × 10-9 m2 s-1. The diffusion coefficient of an isolated ascorbate ion, C6H7O6-, is about 23 % lower than the molecular form; this indicates, as expected, that ions strongly interact with solvent molecules.

Download Full-text

CONTRIBUTION TO THE STUDY OF PYRAZOLONES

Canadian Journal of Chemistry ◽

10.1139/v53-090 ◽

1953 ◽

Vol 31 (7) ◽

pp. 673-684 ◽

Cited By ~ 5

Author(s):

Paul E. Gagnon ◽

Jean L. Boivin ◽

Méüde Tremblay

Keyword(s):

Acetic Acid ◽

Absorption Spectra ◽

Ultraviolet Absorption ◽

Acid Solutions

1,4-Diphenyl-3-carbethoxy-5-aminopyrazole yielded 1,4-diphenyl-5-aminopyrazole by hydrolysis and decarboxylation. The phenylhydrazone of ethyl phenyloxalacetate gave a pyrazolone which was transformed into 1,4-diphenyl-3-amino-5-pyrazolone. The 2,4-diphenyl-3-amino-5-pyrazolone was obtained from ethyl phenylcyanoacetate and phenylhydrazine by heating in acetic acid. 4-Alkyl-3-hydroxy- and 3-amino-5-pyrazolones and 4,4-dialkyl-3-oxo- and 3-imino-5-pyrazolones, substituted in position 2 by carbanilino or α- or β-naphthyl groups, were prepared from ethyl mono- or disubstituted malonates and cyanoacetates, 4-phenylsemicarbazide, and α- and β-naphthylhydrazines. Ultraviolet absorption spectra were determined in neutral and acid solutions.

Download Full-text