Chemical Extractions Affect the Structure and Phenanthrene Sorption of Soil Humin.
Saved in:
| Title: | Chemical Extractions Affect the Structure and Phenanthrene Sorption of Soil Humin. |
|---|---|
| Authors: | Kaijun Wang1, Baoshan Xing1 bx@pssci.umass.edu |
| Source: | Environmental Science & Technology. 11/1/2005, Vol. 39 Issue 21, p8333-8340. 8p. |
| Subjects: | Humins, Soil composition, Extraction (Chemistry), Phenanthrene, Pollutants, Sediments, Carbon |
| Abstract: | Humin is a major fraction of soil organic matter and strongly affects the sorption behavior and fate of organic contaminants in soils and sediments. This study evaluated four different extraction methods for soil humins in terms of their organic carbon structural changes and the consequent effects on phenanthrene sorption. Solid-state 13C NMR demonstrated that 0.1 M NaOH exhaustively extracted humin and humin extracted with 6 M HF/HCl at 60 °C had a relatively high amount of aliphatic components as compared with 1 M HF-extracted humin. The treatment of 6 M HF/HCl at 60 °C greatly reduced carbohydrate components (50-108 ppm) from humin samples, i.e., more than 50% reduction. In addition, the humin from this 6 M HF/HCl treatment contained relatively more amorphous poly(methylene) domains than the humins extracted by other methods. With the respect to phenanthrene sorption, the linearity of sorption isotherm (N) and sorption affinity (KOC) varied markedly among the humin samples extracted by different methods. The NaOH exhaustively extracted humin had the most nonlinear sorption isotherm and the HF-extracted humin had the lowest KOC. It is concluded that humin samples from different extraction procedures exhibited substantial differences in their organic carbon structure and sorption characteristics, even though they were from the same soil. Therefore, one needs to be cautious when comparing the structural and sorption features of soil humins, especially when they are extracted differently. The 6 M HCl/HF extraction at elevated temperature is not encouraged, due to the modifications of chemical structure and physical conformation of organic matter. [ABSTRACT FROM AUTHOR] |
| Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 19242155 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Chemical Extractions Affect the Structure and Phenanthrene Sorption of Soil Humin. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kaijun+Wang%22">Kaijun Wang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Baoshan+Xing%22">Baoshan Xing</searchLink><relatesTo>1</relatesTo><i> bx@pssci.umass.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Environmental+Science+%26+Technology%22">Environmental Science & Technology</searchLink>. 11/1/2005, Vol. 39 Issue 21, p8333-8340. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Humins%22">Humins</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+composition%22">Soil composition</searchLink><br /><searchLink fieldCode="DE" term="%22Extraction+%28Chemistry%29%22">Extraction (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Phenanthrene%22">Phenanthrene</searchLink><br /><searchLink fieldCode="DE" term="%22Pollutants%22">Pollutants</searchLink><br /><searchLink fieldCode="DE" term="%22Sediments%22">Sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon%22">Carbon</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Humin is a major fraction of soil organic matter and strongly affects the sorption behavior and fate of organic contaminants in soils and sediments. This study evaluated four different extraction methods for soil humins in terms of their organic carbon structural changes and the consequent effects on phenanthrene sorption. Solid-state 13C NMR demonstrated that 0.1 M NaOH exhaustively extracted humin and humin extracted with 6 M HF/HCl at 60 °C had a relatively high amount of aliphatic components as compared with 1 M HF-extracted humin. The treatment of 6 M HF/HCl at 60 °C greatly reduced carbohydrate components (50-108 ppm) from humin samples, i.e., more than 50% reduction. In addition, the humin from this 6 M HF/HCl treatment contained relatively more amorphous poly(methylene) domains than the humins extracted by other methods. With the respect to phenanthrene sorption, the linearity of sorption isotherm (N) and sorption affinity (KOC) varied markedly among the humin samples extracted by different methods. The NaOH exhaustively extracted humin had the most nonlinear sorption isotherm and the HF-extracted humin had the lowest KOC. It is concluded that humin samples from different extraction procedures exhibited substantial differences in their organic carbon structure and sorption characteristics, even though they were from the same soil. Therefore, one needs to be cautious when comparing the structural and sorption features of soil humins, especially when they are extracted differently. The 6 M HCl/HF extraction at elevated temperature is not encouraged, due to the modifications of chemical structure and physical conformation of organic matter. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=19242155 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1021/es050737u Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 8333 Subjects: – SubjectFull: Humins Type: general – SubjectFull: Soil composition Type: general – SubjectFull: Extraction (Chemistry) Type: general – SubjectFull: Phenanthrene Type: general – SubjectFull: Pollutants Type: general – SubjectFull: Sediments Type: general – SubjectFull: Carbon Type: general Titles: – TitleFull: Chemical Extractions Affect the Structure and Phenanthrene Sorption of Soil Humin. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kaijun Wang – PersonEntity: Name: NameFull: Baoshan Xing IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: 11/1/2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 0013936X Numbering: – Type: volume Value: 39 – Type: issue Value: 21 Titles: – TitleFull: Environmental Science & Technology Type: main |
| ResultId | 1 |
