Topic
Oxalic acid
About: Oxalic acid is a research topic. Over the lifetime, 11584 publications have been published within this topic receiving 173263 citations. The topic is also known as: ethanedioic acid & H2ox.
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TL;DR: In this article, carbon dioxide in aqueous solution containing tetramethylammonium ions at pH 9 was reduced in two steps to yield oxalic acid at −0.9 V and glyoxylic acid at 0.8 V on carbon and on mercury.
58 citations
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TL;DR: It was determined that water uptake of the NaCl/OA mixture could be enhanced and could be closer to the predictions by addition of levoglucosan or malonic acid, which retained water even at low relative humidity (RH), leading to inhibition of HCl evaporation during dehydration.
Abstract: Atmospheric aerosols are usually complex mixtures of inorganic and organic compounds. The hygroscopicity of mixed particles is closely related to their chemical composition and interactions between components, which is still poorly understood. In this study, the hygroscopic properties of submicron particles composed of NaCl and dicarboxylic acids including oxalic acid (OA), malonic acid (MA), and succinic acid (SA) with various mass ratios are investigated with a hygroscopicity tandem differential mobility analyzer (HTDMA) system. Both the Zdanovskii-Stokes-Robinson (ZSR) method and extended aerosol inorganics model (E-AIM) are applied to predict the water uptake behaviors of sodium chloride/dicarboxylic acid mixtures. For NaCl/OA mixed particles, the measured growth factors were significantly lower than predictions from the model methods, indicating a change in particle composition caused by chloride depletion. The hygroscopic growth of NaCl/MA particles was well described by E-AIM, and that of NaCl/SA particles was dependent upon mixing ratio. Compared with model predictions, it was determined that water uptake of the NaCl/OA mixture could be enhanced and could be closer to the predictions by addition of levoglucosan or malonic acid, which retained water even at low relative humidity (RH), leading to inhibition of HCl evaporation during dehydration. These results demonstrate that the coexisting hygroscopic species have a strong influence on the phase state of particles, thus affecting chemical interactions between inorganic and organic compounds as well as the overall hygroscopicity of mixed particles.
58 citations
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TL;DR: It is shown that a great variety of sugars and related compounds can be fermented to oxalic acid by fluoride and fluoroacetate-insensitive pathways, and that compounds part of or related to the Krebs cycle still appear to form oxalal acid by oxidative splitting of oxalacetate.
58 citations
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TL;DR: In this paper, polypyrrole (PPy) films have been deposited on stainless steel substrates from two different solutions; 0.15 M LiClO 4 in acetonitrile and 0.3 M oxalic acid in water.
Abstract: Polypyrrole (PPy) films have been deposited on stainless steel substrates from two different solutions; 0.15 M LiClO 4 in acetonitrile (ACN-LiClO 4 ) and 0.3 M oxalic acid in water. For this aim cyclic voltammetry technique was used and approximately 1.7 μm thick PPy coating was obtained, applying the same potential range for the film growth in both solutions. The corrosion behaviour of coated and uncoated samples was investigated in 3.5% NaCl solution, using ac impedance spectroscopy and anodic polarisation curves. It was shown that the film obtained from ACN-LiClO 4 had less porous structure and higher stability than that obtained from aqueous oxalic acid solution. The ac impedance results showed that both coatings exhibited important anodic protection behaviour and enhanced the self passivation of steel with protective oxide film.
58 citations
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TL;DR: In this article, a micro flow cell with a micrometric distance between the cathode and the anode was used to perform the electrochemical treatment of waters contaminated by organic pollutants in the absence of added supporting electrolytes with high abatements.
58 citations