رسالة جامعية
Behaviors and fate of nonextractable anthropogenic organohalogens in aquatic and terrestrial environments : formation mechanisms and remobilization potential
| العنوان: | Behaviors and fate of nonextractable anthropogenic organohalogens in aquatic and terrestrial environments : formation mechanisms and remobilization potential |
|---|---|
| المؤلفون: | Zhu, Xiaojing |
| المساهمون: | Schwarzbauer, Jan, Schäffer, Andreas |
| المصدر: | Aachen 1 Online-Ressource (xiii, 155 Seiten) : Illustrationen, Diagramme, Karten (2020). doi:10.18154/RWTH-2020-07960 = Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2020 |
| سنة النشر: | 2020 |
| المجموعة: | RWTH Aachen University: RWTH Publications |
| مصطلحات موضوعية: | info:eu-repo/classification/ddc/550, nonextractable residues, anthropogenic organohalogens, formation mechanisms, remobilization potential |
| جغرافية الموضوع: | DE |
| الوصف: | Anthropogenic or ganohalogens (AOHs) are toxic and persistent pollutants that occur ubiquitously in the environment. An unneglectable portion of them can convert into non extractable residues (NER) in the natural solid substances. NER-AOHs are not detectable by conventional solvent-extraction, and will get remobilized through changes of surrounding environment. Consequently, the formation and fate of NER-AOHs should be investigated comprehensively. In the present study, both field-collected and lab-incubated samples were investigated with respect to the formation mechanisms and fate of non extractable anthropogenic organochlorine/bromine and the newly concerned contaminants per-/polyfluoroalkyl substances (PFASs), respectively. The field samples including terrestrial and aquatic ones were applied with solvent extraction, sequential chemical degradation and tetramethylammonium hydroxide thermochemolysis to obtain both extractable and non extractable AOHs. Over 150 AOHs were detected including DDXs (DDT (bis(chlorophenyl)trichloroethane) and its metabolites/ derivatives). DDT and its first degradation products, DDD (bis(chlorophenyl)dichloroethane) and DDE (bis(chlorophenyl)dichloroethylene), were dominant in the free extractable fraction, whereas DDM (bis(chlorophenyl)methane), DBP (bis(chlorophenyl)methanone) and DDA (bis(chlorophenyl)acetic acid) were observed primarily after chemical degradation. The detection of DDA, DDMUBr (bis(chlorophenyl)bromoethylene), DDPU (bis(chlorophenyl)propene) and DDPS (bis(chlorophenyl)propane) after chemical treatments evidenced the covalent bindings between these DDXs and the organic matrix. The identified NER-DDXs were categorized into three groups according to the three-step degradation process of DDT. Their distribution along the different pathways demonstrated significant specificity. The rest detected AOHs could be either originated from direct industrial emissions or from degradation of their precursors, and therefore were discussed with regard to their molecular ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| العلاقة: | https://publications.rwth-aachen.de/record/794904Test; https://publications.rwth-aachen.de/search?p=id:%22RWTH-2020-07960%22Test |
| الإتاحة: | https://doi.org/10.18154/RWTH-2020-07960Test https://publications.rwth-aachen.de/record/794904Test https://publications.rwth-aachen.de/search?p=id:%22RWTH-2020-07960%22Test |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.2D979ACB |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |