نتایج جستجو برای: phase microextraction

تعداد نتایج: 600074  

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: :analytical and bioanalytical chemistry research 2014
mir ali farajzadeh leila khoshmarram saheleh sheykhizadeh

foodstuffs analysis is very important due to population growth and increasing consumer demand for safety and nutritional excellence. the analysis of different compounds in foodstuffs is so difficult without using sample preparation techniques. traditional techniques require large amounts of toxic organic solvents. as a result, they are not only expensive but also environmentally unfriendly and ...

Journal: :مجله دانشگاه علوم پزشکی قم 0
حمیدرضا حیدری hr heidari qom university of medical sciencesدانشگاه علوم پزشکی قم سید جمال الدین شاه طاهری sj shahtaheri tehran university of medical sciencesدانشگاه علوم پزشکی تهران محمود علیمحمدی m alimohammadi tehran university of medical sciencesدانشگاه علوم پزشکی تهران عباس رحیمی فروشانی a rahimi-froshani tehran university of medical sciencesدانشگاه علوم پزشکی تهران فریده گلبابایی f golbabaei tehran university of medical sciencesدانشگاه علوم پزشکی تهران

background and objectives: analytical methods for volatile organic compounds (vocs) in different samples need extraction of compounds, by applying hazardous solvents. solid phase micro-extraction (spme) is a solvent-free equilibrium extraction method, in which proper calibration can allow quantitative determinations of vocs at a very good sensitivity without the use of any organic solvent. vocs...

Journal: :iranian journal of public health 0
hr heidari dept. of occupational health sj shahtaheri dept. of occupational health, center for environmental research m alimohammadi dept .of environmental health a rahimi-froshani dept. of epidemiology and biostatistics, school of public health, tehran university of medical scien

background: determination of organic pollutants usually requires extraction of the pollutants from samples, using hazard­ous solvent. solid phase micro-extraction (spme) is a solvent-free equilibrium extraction method, in which, proper calibra­tion can allow quantitative measurements of organic pollutants at a very good sensitivity without the use of any organic sol­vent. because individual voc...

Foodstuffs analysis is very important due to population growth and increasing consumer demand for safety and nutritional excellence. The Analysis of different compounds in foodstuffs is so difficult without using sample preparation techniques. Traditional techniques require large amounts of toxic organic solvents. As a result, they are not only expensive but also environmentally unfriendly and ...

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...

2017
Rosa Garcia-Arrona

Triazole fungicides are systemic fungicides applied to protect crops from fungus infections. Its use must be controlled due to the potential harmful effects in environment and human health. Before determination with a chromatographic system, analyte must be isolated and preconcentrated with an extraction step. This review presents the most used microextraction techniques for those compounds in ...

Journal: :Forensic science international 2003
Eric Stauffer John J Lentini

The American Society for Testing and Materials (ASTM) recently updated its standards E 1387 and E 1618 for the analysis of fire debris. The changes in the classification of ignitable liquids are presented in this review. Furthermore, a new standard on extraction of fire debris with solid phase microextraction (SPME) was released. Advantages and drawbacks of this technique are presented and disc...

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