Supercritical Fluid Extraction (SFE) of PCBs and Organochlorine Pesticides from Soil PDF Download
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Author: E. G. van der Velde
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Author: E. G. van der Velde
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Author: Wan A. Wan Ibrahim
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Since the inception of analytical supercritical fluid extraction (SFE) in the early 80's, this technique has garnered great attractions in the extractions of variety of analytes from variety of matrices. In this study. supercritical carbon dioxide (SC CO2) has been examined as a sample preparation method for the extraction of eugenol from plant matrix prior to high performance liquid chromatography (HPLC) analysis and for the extraction of organochlorine pesticides (OCPs) from sewerage sludges and chlorpyrifos from formulation and soil samples prior to capillary gas chromatography (GC) analysis. This is an area of considerable interest as many current methods use environmentally hazardous chlorinated solvents and alternative methods are required. Although numerous studies have examined the potential application of SFE to isolate pesticides and plant products, the work has been qualitative rather than quantitative. The present work describes studies which have examined the supercritical conditions needed for complete extraction of the pesticides and plant product eugenol. Initially a complex matrix sludge was chosen. Later a simple matrix soil was chosen and a single pesticide chlorpyrifos was used as the SFE of sludge was unsuccessful. In the extraction of chlorpyrifos problems were encountered in the trapping of the extract on depressurisation of the SC CO2. The effect of collection solvent, CO2 flow rate, solvent depth, and restrictor heating on the trapping efficiency have been investigated. Two methods of trapping were evaluated. Once a quantitative trapping method was established, the effect of different soil matrices on the recovery of chlorpyrifos at different chlorpyrifos spiking level was investigated. The SFE of soil was compared to Soxhlet extraction.
Author: Tomas Berglöf
Publisher:
ISBN: 9789157655004
Category : Supercritical fluid extraction
Languages : en
Pages : 33
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Author: Jennifer Maria Wing
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
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Author: Janusz Pawliszyn
Publisher: Elsevier
ISBN: 9780444505101
Category : Science
Languages : en
Pages : 1170
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Book Description
This title is the first comprehensive book on sampling and modern sample preparation techniques and has several main objectives: to facilitate recognition of sample preparation as both an integral part of the analytical process; to present a fundamental basis and unified theoretical approach for the professional development of sample preparation; to emphasize new developments in sample preparation technology; and to highlight the future impact of sample preparation on new directions in analytical science, particularly automation, miniaturization and field implementation. Until recently, there has been relatively little scientific interest in sampling and sample preparation, however this situation is presently changing as sampling and sample preparation become integral parts of the analytical process with their own unique challenges and research opportunities. Sampling and Sample Preparation for Field and Laboratory is an essential resource for all analytical chemists, and in particular those involved in method development. Not only does it cover the fundamental aspects of extraction, it also covers applications in various matrices and includes sampling strategies and equipment and how these can be integrated into the analytical process for maximum efficiency.
Author: F. I. Onuska
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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A simple method was developed for the direct coupling of supercritical fluid extractions (SFE) with a high resolution gas chromatograph equipped with an electron capture detector. SFE conditions were investigated for polychlorinated biphenyls from sediments in terms of mobile phase, entrainer, pressure, temperature and mass-flow optimization. The dynamic and static extractions were compared. Determination of PCBs was tested on certified sediment from the National Water Research Institute.
Author: Martha Francis Wolfe
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
A simple method was developed for the direct coupling of supercritical fluid extractions (SFE) with a high resolution gas chromatograph equipped with an electron capture detector. SFE conditions were investigated for polychlorinated biphenyls from sediments in terms of mobile phase, entrainer, pressure, temperature and mass-flow optimization. The dynamic and static extractions were compared. Determination of PCBs was tested on certified sediment from the National Water Research Institute.
Author: WF. Beckert
Publisher:
ISBN:
Category : Environmental analysis
Languages : en
Pages : 13
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Book Description
Sand samples spiked with Aroclor 1232/1260, 17 organochlorine pesticides, 25 organophosphorus pesticides, 43 neutral/acidic compounds, and 16 PAHs were extracted with supercritical carbon dioxide at various pressures and temperatures to establish whether or not such type of compounds can be recovered from solid matrices by supercritical fluid extraction. A few Standard Reference Materials from NIST, spiked only with PAHs, were also evaluated.
Author: Mari Mannila
Publisher:
ISBN: 9789517404006
Category :
Languages : en
Pages : 151
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Book Description
