کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6327405 1619766 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sorption behaviour of perfluoroalkyl substances in soils
ترجمه فارسی عنوان
رفتار جذب مواد پرفروفیالکلی در خاک
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
The sorption behaviour of three perfluoroalkyl substances (PFASs), perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutane sulfonic acid (PFBS), was studied in six soils with contrasting characteristics, especially in the organic carbon content. Sorption isotherms were obtained by equilibrating the soil samples with 0.01 mol L− 1 CaCl2 solutions spiked with increasing concentrations of the target PFAS. The sorption reversibility of PFASs was also tested for some of the samples. Liquid chromatography coupled to tandem mass spectrometry was used to quantify the target PFASs in the solutions. Both the Freundlich and linear models were appropriate to describe the sorption behaviour of PFASs in soils, and enabled us to derive solid-liquid distribution coefficients (Kd) for each compound in each soil. Kd values increased from 19 to 295 mL g− 1 for PFOS, from 2.2 to 38 mL g− 1 for PFOA and from 0.4 to 6.8 mL g− 1 for PFBS, and were positively correlated with the organic carbon content of the soil. KOC values obtained from the correlations were 710, 96 and 17 mL g− 1 for PFOS, PFOA and PFBS, respectively. Whereas Kd values decreased in the sequence PFOS > PFOA > PFBS, desorption yields were lower than 13% for PFOS, from 24 to 58% for PFOA, and from 32 to 60% for PFBS. This shows that the physicochemical characteristics of PFASs, basically their hydrophobicity, controlled their sorption behaviour in soils, with PFOS being the most irreversibly sorbed PFAS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 511, 1 April 2015, Pages 63-71
نویسندگان
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