A flow injection solid-phase extraction preconcentration system using a multi-walled carbon nanotubes (MWCNTs) packed micro-column was developed for the determination of 16 polycyclic aromatic hydrocarbons (PAHs) in water by gas chromatography-mass spectrometry (GC-MS). The preconcentration of PAHs on the MWCNTs was carried out based on the adsorption retention of analytes by on-line introducing the sample into the micro-column system. Methanol was introduced to elute the retained analytes for GC-MS analysis using selected ion monitoring (SIM) mode. Important influence factors were studied in detail, such as sample acidity, sample flow rate, eluent flow rate and volume, dimensions of MWCNTs and amounts of packing material. Limits of detection of 16 PAHs for an extraction of 50 mL water sample were in the range of 0.001-0.15 microg L(-1), and the precisions (RSD) were in the range of 4-14%. The optimized method was successfully applied to the determination of 16 PAHs in surface waters, with recoveries in the range of 72-93% for real spiked sample.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.chroma.2010.02.040 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Repeated intravesical injections of platelet-rich plasma are safe and effective in the treatment of interstitial cystitis/bladder pain syndrome.
Tzu Chi Med J
October 2024
Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan.
Objectives: Interstitial cystitis/bladder pain syndrome (IC/BPS) is a challenging chronic inflammatory condition affecting the urinary bladder, with limited treatment options. This study aims to assess the clinical efficacy of repeated intravesical platelet-rich plasma (PRP) injections for promoting urothelial regeneration and reducing inflammation in patients with IC/BPS and investigate its correlation with subjective and objective treatment-related outcomes.
Materials And Methods: Four monthly intravesical PRP injections were given to 98 patients with non-Hunner-type IC/BPS.
Therapeutic effect of low-dose BMSCs-Loaded 3D microscaffold on early osteonecrosis of the femoral head.
Mater Today Bio
February 2025
Kunming Institute of Zoology, Chinese Academy of Sciences, PR China.
The early treatment of Osteonecrosis of Femoral Head (ONFH) remains a clinical challenge. Conventional Bone Marrow Mesenchymal Stem Cell (BMSC) injection methods often result in unsatisfactory outcomes due to mechanical cell damage, low cell survival and retention rates, inadequate cell matrix accumulation, and poor intercellular interaction. In this study, we employed a novel cell carrier material termed "3D Microscaffold" to deliver BMSCs, addressing these issues and enhancing the therapeutic effects of cell therapy for ONFH.
View Article and Find Full Text PDFbFGF-Chitosan "brain glue" promotes functional recovery after cortical ischemic stroke.
Bioact Mater
April 2025
Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.
The mammalian brain has an extremely limited ability to regenerate lost neurons and to recover function following ischemic stroke. A biomaterial strategy of slowly-releasing various regeneration-promoting factors to activate endogenous neurogenesis represents a safe and practical neuronal replacement therapy. In this study, basic fibroblast growth factor (bFGF)-Chitosan gel is injected into the stroke cavity.
View Article and Find Full Text PDFAnalysis of geological characteristics and potential factors of formation damage in coalbed methane reservoir in Northern Qinshui basin.
Sci Rep
January 2025
School of petroleum engineering, Yangtze University, Wuhan, 430100, China.
Given the suboptimal physical properties and distinctive geological conditions of deep coalbed methane reservoirs, any reservoir damage that occurs becomes irreversible. Consequently, the protection of these deep coalbed methane reservoirs is of paramount importance. This study employs experimental techniques such as scanning electron microscopy, X-ray diffraction, and micro-CT imaging to conduct a comprehensive analysis of the pore structure, mineral composition, fluid characteristics, and wettability of coal seams 3# and 15# in the northern Qinshui Basin of China.
View Article and Find Full Text PDFThe effects of alfaxalone, alone or with butorphanol, on the ultrasonographic appearance of the feline spleen.
Am J Vet Res
January 2025
Department of Comparative Biomedical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS.
Objective: To investigate the sonographic effects of alfaxalone and butorphanol alone and in combination on feline splenic size, shape, margins, echogenicity, echotexture, and blood flow. Our hypothesis was that alfaxalone alone and in combination would be associated with an increase in splenic size and blood flow and a nonhomogenous echotexture.
Methods: This was a randomized, prospective crossover study.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!