Naujų mikroekstrakcijos sistemų kūrimas, tyrimas ir taikymas lakių aromatinių angliavandenilių nustatymui /

A new solid phase microextraction system composed of nanotubes coating fixed on a stainless steel support is suggested. Thermal stability and selectivity of the system was examined. It was determined that the system can be used for direct and headspace extraction of volatile aromatic hydrocarbons. Possibilities of four liquid phase microextraction techniques – hollow fibre liquid phase microextraction, liquid phase microextraction based on the solidification of a floating drop, dispersive liquid-liquid microextraction and dispersion-solidification liquid-liquid microextraction – for the extraction of volatile aromatic hydrocarbons were investigated. Extraction conditions of the investigated methods were optimized and the main analytical characteristics were determined. For all the methods detection limits and repeatability of the results are close. An exception is dispersive liquid-liquid microextraction with slightly higher detection limits. An extraction is especially fast using dispersive liquid-liquid microextraction and dispersion-solidification liquid-liquid microextraction. The most time-consuming method is liquid phase microextraction based on the solidification of a floating drop. All the methods are suitable for clean sample extraction. For the extraction from complex matrices the most suitable methods are headspace solid phase microextraction and hollow fibre liquid phase microextraction. The prepared microextraction techniques were applied for water and snow analysis.

Grantor dc:publisher

Institutional Repository of Vilnius University

Year dc:date

2011

Author dc:creator

• Pusvaškienė, Edita,

Contributors dc:contributor

• Vičkačkaitė, Vida

• Volatile aromatic hydrocarbons ; solid phase microextraction ; liquid phase microextraction techniques

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

lit

Repository record dc:identifier

https://repository.vu.lt/VU:ELABAETD2007367&prefLang=en_US

OAI identifier oai:identifier

oai:vu.lt:elaba:2007367