Influence of substrate on modified oscillation reactions of the Belousov-Zhabotinskii type

1983 ◽  
Vol 48 (11) ◽  
pp. 3223-3228 ◽  
Author(s):  
Peter Ševčík ◽  
Ľubica Adamčíková
Keyword(s):  
Oxalic Acid ◽  
Kinetic Parameters ◽  
Tartaric Acid ◽  
Bz Reaction ◽  
Oscillation Cycle ◽  
Influence Of Substrate

The kinetic parameters of the reaction steps of the oscillation cycle and the parameters of modified oscillation reactions of the Belousov-Zhabotinskii (BZ) type with oxalic acid, tartaric acid, and hypophosphite ions were compared with predictions of Edelson's analysis based on the mechanism of the classical BZ reaction.

OXIDATION OF WHEAT STARCH WITH ALKALINE HYPOCHLORITE

1961 ◽  
Vol 39 (1) ◽  
pp. 61-72 ◽  
Author(s):  
A. A. Eisenbraun ◽  
C. B. Purves
Keyword(s):  
Oxalic Acid ◽  
Tartaric Acid ◽  
Glucuronic Acid ◽  
Carbonic Acid ◽  
Glyoxylic Acid ◽  
Wheat Starch ◽  
Calcium Hypochlorite ◽  
First Order ◽  
Tartronic Acid

The starch was oxidized with 5.5 base molar equivalents of 0.43 M calcium hypochlorite kept near pH 12 and 20°. The rate of oxidation was consistent with the occurrence of two first-order reactions differing in rate by a factor of 10, the more rapid of which consumed about 4 moles of hypochlorite for each C6H10O5 unit actually oxidized. Oxalic acid (0.2 mole) and perhaps carbonic acid [Formula: see text] were formed directly, but it was necessary to hydrolyze the product in order to liberate D-glucose (0.4 mole), glyoxylic acid (0.03 mole), D-erythronic acid (0.11 mole), mesotartaric acid (0.02 mole), D-tartaric acid (0.02 mole), L-tartaric acid (0.01 mole), D-glucuronic acid (0.004 mole), and probably tartronic acid [Formula: see text].

An overview of faba bean: utilisation of husks in natural dyeing

2019 ◽  
Vol 32 (2) ◽  
pp. 188-196 ◽  
Author(s):  
Özlenen Erdem Ismal ◽  
Leyla Yıldırım
Keyword(s):  
Oxalic Acid ◽  
Ammonium Sulfate ◽  
Tartaric Acid ◽  
Faba Bean ◽  
Sodium Acetate ◽  
Natural Dye ◽  
Color Gamut ◽  
Content Type ◽  
Color Coordinates ◽  
Natural Dyeing

Purpose The purpose of this paper is to reveal the potential use of faba bean husk as natural dye, to create a color gamut and to observe the effect of different mordants. Dyeing properties of polyamide/elastane fabric using faba been husk were investigated. The effect of alum [KAl(SO4)2], iron II sulfate Fe(SO4)7H2O, tin II chloride (SnCI22H2O), copper II sulfate (CuSO4), citric acid (C6H8O7), tartaric acid (C4H6O6), oxalic acid (H2C2O4), ammonium sulfate [(NH4)2SO4], sodium acetate (C2H3NaO2), combination of alum-iron, iron-tin and alum-tin were evaluated in terms of color yield, color coordinates and wash fastness. Design/methodology/approach Mainly, dyeings were conducted in accordance with a simultaneous mordanting method. However, pre-mordanted dyeings were also implemented with selected concentration (0.8 g/L) of metallic mordants to enrich color gamut. Control sample (without mordant) was used as a reference for examining the effect of different mordants. Dyed samples were compared mutually in the light of visual evaluation and color measurements and alternatives to metallic mordants were also assessed. Findings Significant differences occurred in color coordinates of dyed samples. The biggest color difference and completely different color shades were achieved with tin II chloride. The type of acid did not create visible color differences. As alternatives to metallic mordants; all of them may be used instead of alum (0.8 g/L). Tartaric acid and oxalic acid, instead of iron II sulfate (0.2 g/L), and ammonium sulfate (0.2 g/L) and sodium acetate (0.8 g/L), instead of alum (0.8 g/L), can be used. Sodium acetate cannot be replaced with iron. A combination of alum-iron and iron-tin can be the alternative to 0.2 and 0.8 g/L copper, respectively. All the samples provided good wash fastness (4/5) values. Originality/value Valorization of industrial, agricultural and domestic wastes as novel natural dye sources is an ecological and sustainable approach. Moreover, the use of man-made fibers in natural dyeing is an issue that needs to be developed and expanded. Few literatures have been found concerning the use of husks of faba bean as a natural colorant. In this initial study, husks of faba been as a vegetable waste were utilized in natural dyeing of polyamide/elastane fabric. It is suggested that this waste can be turned into an economic value through its valorization in natural dyeing.

Oscillations of bromine in Belousov-Zhabotinskii type reaction with oxalic acid

1985 ◽  
Vol 50 (7) ◽  
pp. 1450-1456
Author(s):  
Peter Ševčík ◽  
Jana Dubovská
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Oxidation State ◽  
Oscillation Cycle ◽  
Type Reaction ◽  
Oscillation Reaction ◽  
Induced Reaction

The authors studied the influence of the concentrations of reactants and catalysts on the parameters of the catalysed oscillation reaction of bromate ions with oxalic acid in the medium of sulphuric acid. Ce(IV) and Mn(III) ions induce the reaction of bromine in the oxidation state either +1 or 0 with oxalic acid. In the presence of bromate ions, the induced reaction can lead to the formation of the same quantity of bromine as in the first oscillation cycle of the oscillation reaction.

Uptake of Copper Complexed to EDTA, Diaminoethane, Oxalic Acid, or Tartaric acid by Neon Tetras (Paracheirodon innesi)

2002 ◽  
Vol 53 (2) ◽  
pp. 317-322 ◽  
Author(s):  
Shu Tao ◽  
Aimin Long ◽  
Bo Pan ◽  
Fuliu Xu ◽  
R. Dawson
Keyword(s):  
Oxalic Acid ◽  
Tartaric Acid

scholarly journals Biochemical and Production of Rhubarb Under Growing Technological Factors

2019 ◽  
Vol 70 (6) ◽  
pp. 2000-2003 ◽  
Author(s):  
Alexandru Cojocaru ◽  
Neculai Munteanu ◽  
Brindusa Alina Petre ◽  
Teodor Stan ◽  
Gabriel Ciprian Teliban ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Organic Acids ◽  
Tartaric Acid ◽  
Total Production ◽  
Technological Factors ◽  
Macro Elements ◽  
Micro Elements

The aim of the present study was to assess the influence of two varieties of rhubarb (Glanskin�s Perpetual and De Moldova) and two densities, 10.000 and 13.300 pl/ha on the content of macro (K, Ca, P, Mg, Fe and S), micro�elements (Al, Si and Mn), organic acids (tartaric, oxalic, citric, malic and ascorbic) and total production. The content of oxalic acid in the four versions ranged from 2.3 mg/mL juice in the case of Glanskin�s perpetual cultivation, with the density of 13.300 pl/ha at 3.8 mg/mL in the case of the Moldova variety at the same density. The content of tartaric acid varied in wide limits from 1.75 mg/mL juice to 6.5 mg/mL juice. The content of macro-elements varied within wide limits, the report being: Fe ] K ] Mg ]S ] P ] Ca. The largest production was obtained at the variety De Moldova with density of 13.300 pl/ha.

Effects of EDTA and Organic Acids on Cd Desorption from Zhangshi Irrigation Area Soil

2011 ◽  
Vol 356-360 ◽  
pp. 1566-1569
Author(s):  
Hui Zhou ◽  
Wei Yang ◽  
Miao Liu ◽  
Shi Liang Li ◽  
Qian Qian Li
Keyword(s):  
Acetic Acid ◽  
Oxalic Acid ◽  
Organic Acids ◽  
Tartaric Acid ◽  
Contaminated Soil ◽  
Irrigation Area ◽  
Shenyang City

The effects of the added EDTA and organic acids (oxalic acid, tartaric acid and acetic acid) on Cd desorption of Zhangshi Irrigation Area (ZIR)contaminated soil of Shenyang city was investigated by batch balance experiments, in which the concentrations of acids, pH and temperature were examined. The results showed that EDTA, oxalic acid, tartaric acid and acetic acid modified the desorption behaviors of Cd. And the desorption level was EDTA>tartaric acid >oxalic acid >acetic acid. Also, the desorption amount of Cd increased with the concentration ranges from 5 to 40mmol/L; the desorbed amount obviously reduced with elevating pH when the pH was below 6; the adsorption was facilitated and the desorption was weakened when the pH was above 6. In addition, the Cd desorption amount raised with the temperature increasing.

Equilibria in the Oxalic Acid-Tartaric Acid-Water System.

1965 ◽  
Vol 10 (2) ◽  
pp. 97-98
Author(s):  
M. S. Krishnadas ◽  
M. U. Pai
Keyword(s):  
Oxalic Acid ◽  
Tartaric Acid ◽  
Water System ◽  
Acid Water
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