{"title":"高选择性和敏化分光光度法测定铁(III)电位法研究","authors":"Ardeshir Shokrollahi, Mehrorang Ghaedi, Hamid Reza Rajabi","doi":"10.1002/adic.200790067","DOIUrl":null,"url":null,"abstract":"<p>A simple, selective and sensitized spectrophotometric method for determination of trace amounts of Fe<sup>3+</sup> ion in tap and waste water solutions has been described. The spectrophotometric determination of Fe<sup>3+</sup> ion using Ferron in the presence of N,N-Dodecytrimethylammonium bromide (DTAB) has been carried out. The Beer's law is obeyed over the concentration range of 0.05-2.6 μg mL<sup>-1</sup> of Fe<sup>3+</sup> ion with the relative standard deviation (RSD %) <0.2 % and the molar absorptivity of complexes in pH 3.5 is 3.8×10<sup>3</sup> L mol<sup>-1</sup> cm<sup>-1</sup>.</p><p>Potentiometric pH titration has been used for prediction of protonation constants of ferron, and evaluating its stoichiometry and respective stability constant with Fe<sup>3+</sup> ion. As it is obvious the most likely species of ferron alone and its complexes are LH (log=7.64), LH<sub>2</sub> (log<i>K</i>=10.52), LH<sub>3</sub> (log<i>K</i>=11.74) and ML<sub>2</sub> (logβ= 23.68), ML<sub>3</sub> (logβ= 23.68), ML<sub>3</sub>H (logβ= 23.68), ML<sub>3</sub>H<sub>2</sub> (logβ= 23.68) and ML(OH)<sub>2</sub> (logβ=23.68) respectively.</p>","PeriodicalId":8193,"journal":{"name":"Annali di chimica","volume":"97 9","pages":"823-836"},"PeriodicalIF":0.0000,"publicationDate":"2007-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/adic.200790067","citationCount":"28","resultStr":"{\"title\":\"Highly Selective and Sensitized Spectrophotometric Determination of Iron (III) Following Potentiometric Study\",\"authors\":\"Ardeshir Shokrollahi, Mehrorang Ghaedi, Hamid Reza Rajabi\",\"doi\":\"10.1002/adic.200790067\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>A simple, selective and sensitized spectrophotometric method for determination of trace amounts of Fe<sup>3+</sup> ion in tap and waste water solutions has been described. The spectrophotometric determination of Fe<sup>3+</sup> ion using Ferron in the presence of N,N-Dodecytrimethylammonium bromide (DTAB) has been carried out. The Beer's law is obeyed over the concentration range of 0.05-2.6 μg mL<sup>-1</sup> of Fe<sup>3+</sup> ion with the relative standard deviation (RSD %) <0.2 % and the molar absorptivity of complexes in pH 3.5 is 3.8×10<sup>3</sup> L mol<sup>-1</sup> cm<sup>-1</sup>.</p><p>Potentiometric pH titration has been used for prediction of protonation constants of ferron, and evaluating its stoichiometry and respective stability constant with Fe<sup>3+</sup> ion. As it is obvious the most likely species of ferron alone and its complexes are LH (log=7.64), LH<sub>2</sub> (log<i>K</i>=10.52), LH<sub>3</sub> (log<i>K</i>=11.74) and ML<sub>2</sub> (logβ= 23.68), ML<sub>3</sub> (logβ= 23.68), ML<sub>3</sub>H (logβ= 23.68), ML<sub>3</sub>H<sub>2</sub> (logβ= 23.68) and ML(OH)<sub>2</sub> (logβ=23.68) respectively.</p>\",\"PeriodicalId\":8193,\"journal\":{\"name\":\"Annali di chimica\",\"volume\":\"97 9\",\"pages\":\"823-836\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2007-07-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1002/adic.200790067\",\"citationCount\":\"28\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Annali di chimica\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/adic.200790067\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annali di chimica","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/adic.200790067","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Highly Selective and Sensitized Spectrophotometric Determination of Iron (III) Following Potentiometric Study
A simple, selective and sensitized spectrophotometric method for determination of trace amounts of Fe3+ ion in tap and waste water solutions has been described. The spectrophotometric determination of Fe3+ ion using Ferron in the presence of N,N-Dodecytrimethylammonium bromide (DTAB) has been carried out. The Beer's law is obeyed over the concentration range of 0.05-2.6 μg mL-1 of Fe3+ ion with the relative standard deviation (RSD %) <0.2 % and the molar absorptivity of complexes in pH 3.5 is 3.8×103 L mol-1 cm-1.
Potentiometric pH titration has been used for prediction of protonation constants of ferron, and evaluating its stoichiometry and respective stability constant with Fe3+ ion. As it is obvious the most likely species of ferron alone and its complexes are LH (log=7.64), LH2 (logK=10.52), LH3 (logK=11.74) and ML2 (logβ= 23.68), ML3 (logβ= 23.68), ML3H (logβ= 23.68), ML3H2 (logβ= 23.68) and ML(OH)2 (logβ=23.68) respectively.
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