نتایج جستجو برای: Dispersive liquid–liquid microextraction

تعداد نتایج: 20342  

2016
Hossein Ali Mashayekhi H. A. Mashayekhi

Homogeneous liquidliquid microextraction; Flotation assistance; Diazinon; Water samples ABSTRACT: In the present study a sensitive method for extraction of diazinon in water samples was developed using homogeneous liquid-liquid microextraction via flotation assistance (HLLMEFA). Toluene at microliter volume level was used as extraction solvent. The main advantages of method are high enrichment ...

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 ...

Journal: :journal of chemical health risks 0
m. salahinejad environmental laboratory, nstri, tehran, iran f. aflaki environmental laboratory, nstri, tehran, iran

the dispersive liquid–liquid microextraction (dllme) method for determination of pb +2 and cd +2 ions in the environmental water samples was combined with inductively coupled plasma-atomic emission spectrometry (icp-aes). ammonium pyrrolidine dithiocarbamate (apdc), chloroform and ethanol were used as chelating agent, extraction solvent and disperser solvent, respectively. some effective parame...

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...

2012
Li Zaijun Sun Xiulan Liu Junkang

Direct analysis of samples, regardless their origin, is desirable although for the majority of cases unfeasible on account of the complexity of the sample matrix, inadequate concentration of the target analytes, or even incompatibility with the detector. In these cases, a sample pretreatment step is required for interference removal and analytes separation/preconcentration. Despite valuable adv...

Journal: :analytical and bioanalytical chemistry research 2016
ali daneshfar reza tabaraki raana khodakaramin tahere khezeli

a very simple, rapid and sensitive dispersive liquid-liquid microextraction (dllme) followed by gas chromatography and flame ionization detection (gc-fid) was developed for the determination of phenol and carvacrol in honey samples. a mixture of 100 µl dichloromethane (extraction solvent) and 0.5 ml acetonitrile (disperser solvent) was rapidly injected into sample solution. thereby a cloudy sol...

Journal: :international journal of nano dimension 0
k. motevalli department of applied chemistry, technical and engineering faculty, islamic azad university, south tehran branch, tehran, iran. m. zeeb department of applied chemistry, technical and engineering faculty, islamic azad university, south tehran branch, tehran, iran.

an efficient dispersive liquid-liquid microextraction using tetraalkylammonium bromide coated silver nanoparticles (dllme-agnps) prepared in chloroform has been successfully applied as electrostatic affinity probes to the microextraction and preconcentration of terazosin prior to spectrofluorimetry analysis. this technique is based on a ternary system of solvents, where appropriate amount of mi...

Journal: :analytical and bioanalytical chemistry research 2014
m. adibmehr h. bagheri sadeghi sh. dehghan abkenar

a simple and rapid microextraction procedure based on dispersive liquid-liquid microextraction (dllme) was developed for determination and speciation of trace amounts of chromium (cr) by flame atomic absorption spectrometry (faas). in the proposed approach, chloroform and methanol were used as extraction and dispersive solvents. a new schiff's base ligand, bis(2-methoxy benzaldehyde) ethylene d...

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