{"title":"Empirical ion activity products for Fe(OH)3 estimated from the interaction between 59Fe(III) (14C)EDTA and soils","authors":"Á. Hargitai-Tóth","doi":"10.1016/0166-6622(92)80220-V","DOIUrl":null,"url":null,"abstract":"<div><p>The interaction between FeEDTA and two calcareous soils (a chernozem and a clayey meadow soil) were investigated to estimate the changes in the ion-activity product (IAP) of Fe(OH)<sub>3</sub> over a period of 4 weeks, using the radiotracer technique. <sup>59</sup>Fe was used to determine the quantity of iron. <sup>14</sup>C to assay for EDTA and <sup>45</sup>Ca to measure the calcium.</p><p>The loss of chelating ligand by sorption onto soil was taken into account. The IAP of Fe(OH)<sub>3</sub> for the two soils continuously decreased with time and changed between lg IAP −36.0 and −37.3 Fe(OH)<sub>3</sub> precipitates because of the slow decomposition of FeEDTA above pH 7 and this process is influenced by the competition between calcium (the most significant cation in this pH range) and iron(III) for the ligand and by the slow aging of Fe(OH)<sub>3</sub> precipitates.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1992-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(92)80220-V","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Colloids and Surfaces","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/016666229280220V","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
The interaction between FeEDTA and two calcareous soils (a chernozem and a clayey meadow soil) were investigated to estimate the changes in the ion-activity product (IAP) of Fe(OH)3 over a period of 4 weeks, using the radiotracer technique. 59Fe was used to determine the quantity of iron. 14C to assay for EDTA and 45Ca to measure the calcium.
The loss of chelating ligand by sorption onto soil was taken into account. The IAP of Fe(OH)3 for the two soils continuously decreased with time and changed between lg IAP −36.0 and −37.3 Fe(OH)3 precipitates because of the slow decomposition of FeEDTA above pH 7 and this process is influenced by the competition between calcium (the most significant cation in this pH range) and iron(III) for the ligand and by the slow aging of Fe(OH)3 precipitates.
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