TITLE

Degradation kinetics of ascorbic acid during ohmic heating with stainless steel electrodes

AUTHOR(S)
Assiry, A.; Sastry, S.K.; Samaranayake, C.
PUB. DATE
February 2003
SOURCE
Journal of Applied Electrochemistry;Feb2003, Vol. 33 Issue 2, p187
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Ascorbic acid degradation experiments were performed in buffer solution at pH 3.5 using a batch ohmic heater with uncoated stainless steel electrodes. The electrical conductivity of the buffer solution was adjusted using sodium chloride. The concentration of ascorbic acid was found using an HPLC technique. Kinetics of degradation can be described adequately by a first order model for both conventional and ohmic treatments, but unlike conventional heating, the temperature dependence of degradation for some ohmic treatments cannot be represented by the Arrhenius relation. During ohmic heating, power, temperature and NaCI content affect the degradation rate. A number of reactions, including electrode reactions, electrolysis of the solution, as well as reactions between electrode materials and electrolysis products may influence the reaction mechanism as well as kinetic parameters. At the highest power and salt content, citrate complexation and a significant loss of buffering capacity were noted, resulting in an increase in pH. The results underline the importance of inert electrode coatings, or the use of high frequency power for control of electrochemical reactions.
ACCESSION #
15102815

 

Related Articles

  • Decolorization of Acid Brown and Reactive Blue Dyes by Anodic Oxidation in a Batch Recycle Electrochemical Reactor. El-Ashtoukhy, E- S. Z.; Amin, N. K.; Abdel-Aziz, M. H. // International Journal of Electrochemical Science;Nov2012, Vol. 7 Issue 11, p11137 

    Decolorization and COD measurements of synthetic wastewater containing acid brown and reactive blue dyes were studied using a batch recycle annular electrochemical reactor. Graphite rod was used as anode while stainless steel screen was used as cathode. The effect of current density, sodium...

  • Layers with tantalum oxides on stainless steel. Rudnev, V.; Yarovaya, T.; Nedozorov, P.; Lukiyanchuk, I.; Medkov, M. // Protection of Metals & Physical Chemistry of Surfaces;Sep2015, Vol. 51 Issue 5, p817 

    Peculiarities of plasma electrolytic oxidation of stainless steel (grade 12Kh16N10T) in an aqueous electrolyte-suspension with tantalic acid and the composition and structure of formed surface layers have been investigated. Under the effect of bipolar anodic-cathodic current, thin interference...

  • Ultracleaning.  // Orthopedic Design & Technology;Jan/Feb2012 Supplement, p8 

    The article offers information on the characteristics of metals parts finished through the process of electropolishing. It says that electropolished parts of materials including stainless steel are more resistant to oxidation, tarnish, and corrosion. It adds that electropolished surfaces are...

  • Electrochemical copolymerization of dibenzo-18-crown-6 and carbazole and characterization of their copolymer. Jiong Wang; Baoyang Lu; Congcong Liu; Jingkun Xu; Meishan Pei // Journal of Materials Science;Nov2010, Vol. 45 Issue 21, p5769 

    The electrochemical copolymerization of carbazole (CZ) and dibenzo-18-crown-6 (DBC) was successfully achieved in pure boron trifluoride diethyl etherate (BFEE) by direct anodic oxidation of the monomer mixtures on the platinum or stainless steel electrodes. The optimal feed ratio together with...

  • Electrochemical Oxidation of Color, BOD and COD in Textile Dyehouses using the Patented Brinecell Electrochemical Oxidant Generators.  // Textile Chemist & Colorist;Sep97, Vol. 29 Issue 9, p3 

    The article cites a study about Textile Dye Wastewater (TDW) that was treated by an electrochemical oxidation method using Ti/Pt anode and Stainless Steel 304 as cathode. It mentions that the organic pollutants were oxidized to carbon dioxide and water due to the strong oxidizing potential of...

  • Electrocoagulation and electro-oxidation treatment for the leachate of oil-drilling mud. Ighilahriz, K.; Ahmed, M. Taleb; Djelal, H.; Maachi, R. // Desalination & Water Treatment;Sep2014, Vol. 52 Issue 31-33, p5833 

    The pollution caused by discharges of oil drilling is now a source of environmental degradation and raises currently a particular interest. We propose in this work the application of electrocoagulation (EC) and electro-oxidation (EO) treatment for the leachate of these drilling muds. The effect...

  • Mechanism of and method to avoid discoloration of stainless steel surfaces in laser cleaning. Lu, Y.F.; Song, W.D.; Hong, M.H.; Chong, T.C.; Low, T.S. // Applied Physics A: Materials Science & Processing;1997, Vol. 64 Issue 6, p573 

    In laser cleaning of stainless steel surfaces, the discoloration takes place on the surfaces irradiated by excimer lasers in the air as laser fluence and pulse number exceed a discoloration threshold. The color of stainless steel surfaces changes to that of γ-Fe[sub 2] O[sub 3] . Based on...

  • Residual stress study in oxide scale obtained on high temperature oxidation of AISI 430 stainless steel. Ning LI; Ji XIAO; PRUD'HOMME, Nathalie; Jl, Vincent // Advanced Materials Research;2014, Vol. 996, p918 

    The objective of this work was to investigate high temperature oxidation behavior of AISI 430 stainless steel, which was proposed to use as interconnector in the planar solid oxide fuel cells (SOFCs). The oxidation of the alloy has been conducted at 700°C, 800°C and 900°C for 12h- 96h...

  • Anodic voltammetric behavior of ascorbic acid and its selective determination in pharmaceutical dosage forms and some Rosa species of Turkey. Erdurak-Kiliç, C. S.; Uslu, B.; Dogan, B.; Ozgen, U.; Ozkan, S. A.; Coskun, M. // Journal of Analytical Chemistry;Nov2006, Vol. 61 Issue 11, p1113 

    Ascorbic acid is the most common electroactive biological compound found in some plant species (e.g., Citrus species, Rosa species). The electrochemical oxidation of ascorbic acid was investigated by cyclic, linear sweep, differential pulse (DPV), and square wave (SWV) voltammetry. For...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics