An evaluation of two methods for determinations of polynuclear aromatic hydrocarbons in water Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5m60qv943

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  • Research has been completed that evaluates two methods for the extraction of polynuclear aromatic hydrocarbons (PNAH) from water. The two methods compared were EPA Method 610, a liquid-liquid extraction method, and a method involving PNAH adsorption on commercially available short C₁₈ bonded phase columns, Sep-Paks, in series with glass microfiber filters. Eleven PNAH were found to be present in water samples from Yaquina Bay, Oregon at four sites. Concentrations of the eleven PNAH ranged from 0.1 pg/mL to 16.8 pg/mL depending on the method of extraction. EPA Method 610, the approved method for analysis of effluent waters, will underestimate the concentration of environmental levels of PNAH in natural waters. This can be explained by the tendency for PNAH to be primarily associated with organic particulates in the water sample. The extraction efficiency for Method 610 has been reported to be close to 100% for PNAH in solution. However, this method is not as efficient for particulate-bound PNAH. Adsorption on Sep-Pak minicolumns will also underestimate environmental levels of PNAH due to column overloading and irreversible adsorption. High octanol/water partition coefficients of PNAH suggest that they will be primarily associated with organic particulates, not present in the soluble form. Therefore, removal of the particulates by filtration with subsequent extraction of the filters by the Soxhlet method may provide the best estimate of PNAH concentrations in natural waters. Such a method is relatively fast, simple and inexpensive method for routine environmental monitoring.
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