S. Castillo-Rojas , A. Negrón-Mendoza, Z.D. Draganić, I.G. Draganić
{"title":"The radiolysis of aqueous solutions of malic acid","authors":"S. Castillo-Rojas , A. Negrón-Mendoza, Z.D. Draganić, I.G. Draganić","doi":"10.1016/0146-5724(85)90232-8","DOIUrl":null,"url":null,"abstract":"<div><p>Oxygen-free aqueous solutions of 0.05 mol dm<sup>-3</sup> malic acid (pH 2.4) were irradiated with <sup>60</sup>Co λ rays (0.1–92 kGy). Various small molecules were identified: CO, CO<sub>2</sub>, CH<sub>4</sub>, HCHO, CH<sub>3</sub>CHO, (HCO)<sub>2</sub>, CH<sub>3</sub>COCHO, and CH<sub>3</sub>COOH. With the exception of CO<sub>2</sub>, they appear in small yields (<em>G</em>< 0.1) and represent minor radiolytic products. About 16 di-and polycarboxylic acids appear in irradiated solution, among them malonic and succinic acids being fairly abundant. Of particular importance is the efficient formation of dimers and trimers of malic acid. From the experimental data the value of <em>k</em>(e<sup>-</sup><sub>aq</sub> + (HOOCCH<sub>2</sub>CH(OH)COOH) was evaluated as ⩾3 × 10<sup>9</sup> dm<sup>3</sup> mol<sup>-1</sup> s<sup>-1</sup>. Probable free-radical reactions leading to the formation of the radiolytic products are considered.</p></div>","PeriodicalId":101054,"journal":{"name":"Radiation Physics and Chemistry (1977)","volume":"26 4","pages":"Pages 437-443"},"PeriodicalIF":0.0000,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-5724(85)90232-8","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiation Physics and Chemistry (1977)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0146572485902328","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 13
Abstract
Oxygen-free aqueous solutions of 0.05 mol dm-3 malic acid (pH 2.4) were irradiated with 60Co λ rays (0.1–92 kGy). Various small molecules were identified: CO, CO2, CH4, HCHO, CH3CHO, (HCO)2, CH3COCHO, and CH3COOH. With the exception of CO2, they appear in small yields (G< 0.1) and represent minor radiolytic products. About 16 di-and polycarboxylic acids appear in irradiated solution, among them malonic and succinic acids being fairly abundant. Of particular importance is the efficient formation of dimers and trimers of malic acid. From the experimental data the value of k(e-aq + (HOOCCH2CH(OH)COOH) was evaluated as ⩾3 × 109 dm3 mol-1 s-1. Probable free-radical reactions leading to the formation of the radiolytic products are considered.
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