Development of solid phase microextraction (SPME) fibers for various analytical applications: (I) Selenium speciation in waters. (II) Separation and determination of triclosan and triclocarban in waters için kapak resmi
Development of solid phase microextraction (SPME) fibers for various analytical applications: (I) Selenium speciation in waters. (II) Separation and determination of triclosan and triclocarban in waters
Başlık:
Development of solid phase microextraction (SPME) fibers for various analytical applications: (I) Selenium speciation in waters. (II) Separation and determination of triclosan and triclocarban in waters
Yazar:
Ziyanak, Esen, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
xii, 86 leaves: illustrarions, charts;+ 1 computer laser optical disc.
Özet:
In the first part of this study, four selenium species namely selenite, selenate, selenomethionine and selenocystine in water samples were tried to be separated using single solid phase microextraction (SPME) fiber on the same chromatographic run. Bare silica fibers were immersed into agarose matrix containing nano zerovalent iron (nZVI), ceria (CeO2) or zirconia (ZrO2). After characterization of fibers sorption/desorption parameters were optimized and standard reference materials were used to validate the proposed method. Direct mode of SPME method was used to extract the analytes prior to their separation with HPLC and detection with ICPMS. The optimum conditions for the extraction of selenium species with nZVI-agarose fibers are obtained as extraction pH: 4.0, agitation speed: 700 rpm, extraction time: 60 min, desorption matrix: 10.0 mM citrate solution, desorption time: 30 min, solution temperature: 25 °C, ionic strength: no NaCl addition. In the second part of this study, same fibers were used to separate triclosan (TCS) and triclocarban (TCC) using HPLC-DAD. Among all fibers prepared, nZVI-agarose modified fibers demonstrated the best extraction performance. The optimum conditions for the extraction of TCS and TCC with nZVI-agarose fibers are obtained as extraction pH: 5.0 and 7.0, agitation speed: 400 rpm, extraction time 60 min, desorption matrix: % 90 methanol - %10 water (adjusted to pH 3.0 with acetic acid), desorption time: 30 min, ionic strength: no NaCl addition.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Doctoral)--İzmir Institute of Technology:Chemistry.

İzmir Institute of Technology:Chemistry--Thesis (Doctoral).
Elektronik Erişim:
Access to Electronic Versiyon.
Ayırtma: Copies: