نتایج جستجو برای: liquid liquid microextraction

تعداد نتایج: 219504  

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...

Journal: :analytical and bioanalytical chemistry research 0
alireza ghiasvand department of chemistry, lorestan university, khoramabad, iran afagh nasirian department of chemistry, lorestan university, khoramabad, iran samira koonani department of chemistry, lorestan university, khoramabad, iran kolsoom nouriasl department of chemistry, lorestan university, khoramabad, iran

since solid-phase and liquid-phase microextraction (spme and lpme) were introduced, as effective solvent-free methods, many efforts have been made to improve their modes and applications. however, due to limitations with sensitivity and efficiency, researchers have focused on improving the performance of their basic primary modes. in this way, in recent years, different methods such as ultrason...

Journal: :iranian journal of analytical chemistry 2014
majid haji hosseini mohammad reza rezaei mohammad rezaee peyman asaadi khatereh ashtari

this study propose a new analytical protocol for the determination of benzene, xylene, toluene and styrene in water samples using homogeneous liquid-liquid microextraction via flotation assistance (hllme-fa) technique followed by gas chromatography-mass spectrometry (gc-ms). in this research, a special extraction cell was designed to facilitate collection of the low-density solvent extraction. ...

Journal: :analytical and bioanalytical chemistry research 2015
alireza ghiasvand shahriar shadabi somayeh hajipour afagh nasirian

in this research, a rapid, reliable and selective dispersive liquid-liquid microextraction (dllme) followed by direct injection of microdroplet to graphite furnace atomic absorption spectrometry (gf-aas) method for the determination of ultra-trace amounts of ag(i) was developed. effect of the important experimental parameters on the extraction efficiency of ag(i) was investigated using response...

Journal: :journal of chemical health risks 0
j. abolhasani department of chemistry, faculty of science, tabriz branch, islamic azad university, tabriz, iran m. amjadi department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran e. ghorbani kalhor department of chemistry, faculty of science, tabriz branch, islamic azad university, tabriz, iran

a sensitive, selective and effective ionic liquid-based single drop microextraction technique was developed by using ionic liquid, 1-hexyl-3-methylimidazolium hexafluorophosphate, c6mimpf6, coupled with electrothermal atomic absorption spectrometry (etaas) for the determination of copper and silver in environmental samples. dithizone was used as chelating agent. several factors that influence t...

Journal: :iranian journal of analytical chemistry 2014
soleyman bahar bahare babamiri

in this work, a procedure for preconcentration of cobalt using dispersive liquid–liquid microextraction (dllme) with the reagent 1-nitroso 2-naphtol as complexing reagent was developed. at ph 4, co(ii) was complexed with 1-nitroso 2-naphtol and extracted into the fine droplets formed when mixing chloroform (extraction solvent), ethanol (disperser solvent) and the sample solution. after extracti...

Journal: :iranian journal of analytical chemistry 2015
soleyman bahar

in this work, a procedure for preconcentration of silver using dispersive liquid–liquid microextraction with the reagent dithizone as complexing reagent was developed. at ph 2, silver ions are complexed with dithizone and extracted into the fine droplets formed when mixing carbon tetrachloride (extraction solvent), ethanol (disperser solvent) and the sample solution. after extraction, the phase...

Journal: :desert 2015
seyyed behnam abdollahi boraei daryoush afzali

thallium is widely found in nature, but the only inorganic stones full of this element are crookesite and lorandit. it isalso found in pyrites of copper, lead and inorganic stones. the element and its compositions are toxic and harmful to theenvironment; therefore, its application requires caution and further research. it is important to develop sensitive andaccurate analytical methods to deter...

Journal: :iranian journal of basic medical sciences 0
rana fazeli-bakhtiyari liver and gastrointestinal diseases research center, tabriz university of medical sciences, tabriz, iran department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran vahid panahi-azar drug applied research center, tabriz university of medical sciences, tabriz, iran mohammad hossein sorouraddin department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran abolghasem jouyban pharmaceutical analysis research center and faculty of pharmacy, tabriz university of medical sciences, tabriz, iran

objective(s): dispersive liquid-liquid microextraction coupled with gas chromatography (gc)-flame ionization detector was developed for the determination of valproic acid (vpa) in human plasma. materials and methods: using a syringe, a mixture of suitable extraction solvent (40 µl chloroform) and disperser (1 ml acetone) was quickly added to 10 ml of diluted plasma sample containing vpa (ph, 1.0...

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