نتایج جستجو برای: spme solid phase microextraction

تعداد نتایج: 754919  

Journal: :international journal of occupational hygiene 0
abdulrahman bahrami excellence centre for occupational health, research centre for health sciences, school of public health, hamadan university of medical science, hamadan, iran. farshid ghorbani department of occupational health engineering, research centre for health sciences, school of public, health, hamadan university of medical science, hamadan, iran. hadi baiati department of occupational health engineering, research centre for health sciences, school of public, health, hamadan university of medical science, hamadan, iran. mohammadjavad zare-sakhvidi department of occupational health, faculty of health engineering, shahidsadoughi university of medical sciences,yazd, iran.

carbon disulfide is used predominantly in the manufacture. it has affects the nervous system. in this study, the applicability of spme as a passive sampler for determination of carbon disulphide in air was studied. effect of sampler and environmental parameters on uptake of carbon disulphide was studied as well. four fibers were tested to select the best sampler for determine carbon disulfide i...

Journal: :Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment 2010
N Rastkari R Ahmadkhaniha M Yunesian L J Baleh A Mesdaghinia

A reliable and sensitive method for simultaneous determination of bisphenol A (BPA) and bisphenol F (BPF) in canned food by gas chromatography-mass spectrometry (GC/MS) is described after extraction and pre-concentration by a new solid-phase microextraction (SPME) adsorbent. The potential of single-walled carbon nanotubes (SWCNTs) as SPME adsorbent for the pre-concentration of environmental con...

Journal: :Analytical chemistry 2016
Omprakash Nacham Kevin D Clark Jared L Anderson

The determination of extremely small quantities of DNA from complex biological sample matrices represents a significant bottleneck in nucleic acid analysis. In this study, polymeric ionic liquid (PIL)-based solid-phase microextraction (SPME) was applied for the extraction and purification of DNA from crude bacterial cell lysate with subsequent quantification by real-time PCR (qPCR) analysis. Us...

Journal: :Chemosphere 2006
Alethea T Bowen Jason M Conder Thomas W La Point

Tubifex tubifex metabolizes 2,4,6-trinitrotoluene (TNT) to 2-amino-4,6-dinitrotoluene (2ADNT) and 4-amino-2,6-dinitrotoluene (4ADNT). Elimination rates of metabolically-generated ADNTs are low compared to ADNTs absorbed directly from water, suggesting that metabolically-generated ADNTs may be bound or sequestered within tissue and therefore less available for elimination. A solid phase microext...

Journal: :Journal of chromatographic science 2006
Yuan-Yuan Zhao Steve Hrudey Xing-Fang Li

The development of a technique combining solid-phase microextraction (SPME) with microbore high-performance liquid chromatography (micro-HPLC)-tandem quadrupole time-of-flight (QTOF) mass spectrometry (MS) for determination of dissolved microcystins in water is reported. Several important parameters affecting the efficiency of SPME extraction of microcystins are investigated. A microbore C18 co...

Journal: :Journal of agricultural and food chemistry 2001
J C Beaulieu C C Grimm

Using an automated rapid headspace solid phase microextraction (SPME) method for volatile extraction in cantaloupes, 86 compounds already reported for muskmelons were recovered and an additional 53 compounds not previously reported were identified or tentatively identified. The SPME method extracted a copious number of volatiles that can be analyzed to clearly differentiate between variety, gro...

Journal: :Chemosphere 2015
Keith A Maruya Wenjian Lao David Tsukada Dario W Diehl

The elevated occurrence of hydrophobic organic chemicals (HOCs) such as polycyclic aromatic hydrocarbons (PAH), polychlorinated biphenyls (PCBs) and legacy organchlorine pesticides (e.g. chlordane and DDT) in estuarine sediments continues to poses challenges for maintaining the health of aquatic ecosystems. Current efforts to develop and apply protective, science-based sediment quality regulati...

Journal: :Metabolites 2023

Approximately 25% of psoriasis patients have an inflammatory arthritis termed psoriatic (PsA). There is strong interest in identifying and validating biomarkers that can accurately reliably predict conversion from to PsA using novel technologies such as metabolomics. Lipids, particular, are key disease. We sought develop a liquid chromatography-mass spectrometry (LC-MS) method be used conjuncti...

Journal: :Environmental toxicology and chemistry 2007
Jing You Peter F Landrum Tricia A Trimble Michael J Lydy

Two chemical approaches, Tenax extraction and matrix solid phase microextraction (matrix-SPME), were evaluated as surrogates to estimate bioavailability of polychlorinated biphenyls (PCBs) from field-contaminated sediment. Aroclor 1254 was the primary contaminant found in sediment from Crab Orchard Lake in Marion, Illinois, USA, and a total of 18 PCB congeners were selected for study. Bioaccumu...

Journal: :Journal of agricultural and food chemistry 2000
V R Hebert C Hoonhout G C Miller

New methods were developed to determine photolysis rates of medium-weight pesticides in the gas phase using elevated air temperatures and solid-phase microextraction (SPME). A 57-L glass chamber was constructed that utilized collimated xenon arc irradiation that could heat chamber air to increase the amount of pesticide in the gas phase. Gas-phase photolysis rates were determined at various air...

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