Semivolatile organic compound extraction

Prepai ative isolation of nonvolatile and semivolatile organic compounds fractions (hydrophobic weak acids, hydrophobic weak bases, hydrophobic neutrals, humic and fulvic acids) from natural and drinking waters in optimal conditions was systematically investigated by solid-phase extraction method with porous polymer sorbents followed by isolation from general concentrate of antropogenic and/or toxic semivolatile compounds produced in chlorination and ozonation processes. 

The steam-enhanced recovery process (SERF) is an in situ technology designed to remove and treat volatile and semivolatile organic compounds (VOCs and SVOCs) in contaminated soils by using steam injection and vacuum extraction. The technology is based on the idea that added heat (thermal enhancement) increases the volatility and mobility of SVOCs and VOCs and thus facilitates the extraction of soil contaminants. The process works by injecting high-quality steam... 

Soil vapor extraction (SVE) (also called vacuum extraction, soil venting, or in situ vaporization) is used to remove volatile organic compounds (VOCs) and some semivolatile organic compounds (SVOCs) from contaminated soil. SVE systems apply a vacuum in an extraction well to remove soil vapors. This creates a negative pressure that causes the volatilization of some chemicals in the vadose zone of the soil. The technology has also been used to extract non-aqueous-phase liquid (NAPE). Contaminant volatilization is often enhanced through the use of air injection wells to supply unsaturated air into the vadose zone of the soil. 

In situ thermal extraction is a process for the removal of volatile and semivolatile organic compounds (VOCs and SVOCs) from contaminated soils and groundwater. The process primarily treats chlorinated solvents such as trichloroethylene (TCE), tetraehloroethylene (PCE), and dichlorobenzene hydrocarbons such as gasoline, diesel, and jet fuel and mixtures of these compounds. 

The Terra Vac vacuum extraction process is a patented, in situ process used to remove volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) from contaminated... 

Yoshida, T., Matsunaga, I. and Oda, H. (2004) Simultaneous determination of semivolatile organic compounds in indoor air by gas chromatography-mass spectrometry after solid-phase extraction. Journal of Chromatography A, 1023, 255-69. 

Organic substances that are not volatile are grouped under semivolatiles. The latter class also includes substances of very low volatility such as chlorinated biphenyls and polynuclear aromatics. As far as the GC/MS technique goes, the principle of analysis of the semivolatile organics is not so distinctly different from that of the volatile organics. On the other hand, the method of extraction of analytes from the sample matrices and the sample concentration steps for these semivolatile organic compounds vastly differ from the volatile organics. Such extraction techniques and the sample cleanup methods are discussed more extensively in Chapter 1.5. 

Semivolatile organic compounds SW-846 3510/8270 SW-846 3520/8270 CLP SOW One liter amber glass, PTFE-lined lid 1000 ml 2 to 6°C 7 days for extraction, 40 days for analysis... 

SPME can be used to extract semivolatile organics from environmental waters and biological matrices as long as the sample is relatively clean. Extraction of semivolatile organic compounds by SPME from dirty matrices is more difficult [134], One strategy for analyzing semivolatiles from dirty matrices is to heat the sample to drive the compound into the sample head-space for SPME sampling another approach is to rinse the fiber to remove nonvolatile compounds before analysis [134],... 

The stir bar technique has been applied to headspace sorptive extraction (HSSE) [142-144], However, headspace techniques are discussed elsewhere, as they are more applicable to volatile organic compounds than to the semivolatile organic compounds that comprise the focus of this chapter. 

EXTRACTION OF SEMIVOLATILE ORGANIC COMPOUNDS FROM SOLID MATRICES... 

Yang, M.J. and J. Pawliszyn Extraction of Semivolatile Organic compounds... 

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