نتایج جستجو برای: assisted microextraction

تعداد نتایج: 133498  

2012
Mohsen Zeeb Mahdi Sadeghi

An efficient and environmentally friendly sample preparation method based on the application of hydrophobic 1-Hexylpyridinium hexafluorophosphate [Hpy][PF(6)] ionic liquid (IL) as a microextraction solvent was proposed to preconcentrate terazosin. The performance of the microextraction method was improved by introducing a common ion of pyridinium IL into the sample solution. Due to the presence...

2012
Sanna Holopainen Marjaana Nousiainen Osmo Anttalainen Mika E.T. Sillanpää

The requirement to monitor the chemical quality of water has become one of the major issues in environmental analytics. Ionmobility spectrometry (IMS), a fast, sensitive method traditionally used in security and military applications, is also suitable for environmental analysis and detection of organic pollutants from aqueous matrices, when combined with advantageous methods to isolate analytes...

Journal: :Environmental monitoring and assessment 2013
Mahmoud Chamsaz Mohammad Eftekhari Ali Eftekhari Ali Yekkebashi

Highly rapid and selective vortex-assisted liquid-liquid microextraction based on solidification of organic drop has been used for determination of cobalt ion. 2-Nitroso-1-naphthol (2N1N) was used as a selective complexing agent to form stable cobalt-2N1N complex which can be extracted with 1-undecanol at a short time by the assistance of vortex agitator system followed by its determination usi...

Elham Pournamdari Mohsen Zeeb Sana Berijani

We represent an environmentally friendly sample of pre-treatment method, ultrasound assisted emulsification microextraction (USAEME) followed by gas chromatography nitrogen phosphorous detector (GC-NPD), to specify atrazine residues in environmental samples. Some parameters affecting the extraction efficiency such as the type and volume of the extraction solvent, emulsification time and additio...

2016
Abolfazl Saleh Neda Sheijooni Fumani Saeideh Molaei Ehsan Abedi Homeira Agah Shirin Rahmanpour

In the present study, antifouling booster biocides, irgarol 1051 and diuron, were measured in seawater and sediments in ports and marinas of Bushehr, Iran. To the best of our knowledge, in the Persian Gulf there is no any record about analysis of these compounds in coastal waters, however there are considerable amount of information about the concentration of antifouling booster biocides in Eur...

Journal: :Journal of chromatographic science 2013
Xueju Lv Yi Hao Qiong Jia

Phthalate esters are endocrine disrupters or mutagens. They are widely used as plasticizers and can be usually found in environmental samples, such as food, soil and polluted air. However, it is difficult to directly determine phthalate esters owing to their relatively low concentration and complex matrices. Therefore, preconcentration and separation have become increasingly important. In recen...

2015
Ivanise Gaubeur Miguel Ángel Aguirre Nikolay Kovachev Montserrat Hidalgo Antonio Canals

In this study, an analytical methodology based on a combination of dispersive liquid–liquid microextraction with laser-induced breakdown spectrometry was evaluated for simultaneous pre-concentration, speciation and detection of Cr. The microextraction procedure was based on the injection of appropriated quantities of 1-undecanol and ethanol into a sample solution containing the complexes formed...

Journal: :Molecules 2014
Ma Esther Torres Padrón Cristina Afonso-Olivares Zoraida Sosa-Ferrera José Juan Santana-Rodríguez

Until recently, sample preparation was carried out using traditional techniques, such as liquid-liquid extraction (LLE), that use large volumes of organic solvents. Solid-phase extraction (SPE) uses much less solvent than LLE, although the volume can still be significant. These preparation methods are expensive, time-consuming and environmentally unfriendly. Recently, a great effort has been ma...

Journal: :Journal of separation science 2013
Jiaheng Zhang Min Li Yubo Li Zongyang Li Fenfen Wang Qiu Li Wenfeng Zhou Runhua Lu Haixiang Gao

In this study, ionic liquid (IL) supported magnetic dispersive solid-phase microextraction was developed and a systematic investigation was conducted on imidazolium ILs for their extraction performance. This nano-based pretreatment procedure was then applied for the determination of acaricides in fruit juice samples for the first time. A feature of this technique is that the commonly laborious ...

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