نتایج جستجو برای: continuous micro solid phase extraction

تعداد نتایج: 1241313  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2004
parissa khadiv parsi mohammad ali moosavian

after designing and constructing a coalescence cell, drop/interface coalescence phenomenon was studied in the absence and presence of single surfactant.two surface active agents of sodium dodecyl sulfate and 1-decanol were used. distilled water was used as dispersed phase. toluene, n-heptane and aqueous 60% (v/v) of glycerol were selected as continuous phases, separately. it was found that the ...

Afsaneh Mollahosseini Nima Baghbadrani Seyed Saeid Hosseini

In the present work, a stainless steel wire was etched by hydrochloric acid during a chemical etching process. The obtained black layer on the surface of the fiber was used as sorbent for extraction of trace amount of phthalates in the aqueous samples by solid phase microextraction. New fiber efficiency was investigated using a home-made solid-phase microextraction (SPME) device and gas chr...

Journal: :Physical review letters 2008
Gregory M Grason

We demonstrate that the phase transition from columnar-hexagonal liquid crystal to hexagonal-crystalline solid falls into an unusual universality class, which in three dimensions allows for both discontinuous transitions as well as continuous transitions, characterized by a single set of exponents. We show by a renormalization group calculation (to first order in =4-d) that the critical exponen...

2016
Sabrina de Bona Sartor Marla Sganzerla José Teixeira Filho Helena Teixeira Godoy

A method for optimization of extraction of volatile compounds in Chardonnay wine was developed using headspace-solid phase microextraction (HS-SPME) and gas chromatography coupled with triple quadrupole tandem mass spectrometry (GCMS/MS). Optimization of the HS-SPME conditions, temperature (T, ̊C) and extraction time (t, minutes), was carried out using a 2 factorial central composite rotational...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1377

در اینجا با اصلاحی که بر مدل multi solid phase انجام شده است ، و روش حل پیشنهادی یک برنامه کامپیوتری برای پیش بینی دمای پیدایش واکس و همچنین میزان واکس تشکیل شده، در نمونه های نفتی مختلف ، ارائه شده است . در این کار از مدل فاز جامد چندگانه (multi solid phase)، که روشی مبتنی بر تحقیقات و آزمایشات انجام شده در سالهای اخیر (1991-1997) می باشد، استفاده می شود. در این مدل گفته می شود که در ابتدا فاز...

Journal: :Journal of Chromatographic Science 1997

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