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Headspace Analysis Of Priority Pollutants To Determine Solubility Limits And A Comprehensive Examination Of Parameter Effects

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Description: The research investigated two important aspects of analysis of some of the volatile organic priority pollutants from the Environmental Protection Agency's list. Namely, the determination of the solubility limit of some of these compounds using static headspace analysis or vapor equilibration coupled with gas chromatography (GC), static headspace was also evaluated as an alternative method to the EPA methods for volatile compounds prescribing the use of purge and trap analysis also coupled with GC. The use of static headspace for the analysis of priority pollutants in water is not new, what is original about this research is the examination of the effects of ionic strength, variable headspace gases and varying volume ratios. the effects of changing these parameters on the analysis of twenty-six of the volatile priority pollutants by static headspace--GC are discussed. The solubility limits of several compounds among the purgeable halocarbon and aromatic fractions of the EPA priority pollutant list are not available in the literature. Up to now, it seems most data tables and literature references listing solubility limits have used g/100mL or mg/mL as the corresponding units. Compounds wghich have solubility limits at the parts per million range (ppm or mg/L) are generally listed as insoluble, and no numerical value is given. Another common problem is encountered in consulting several literature sources, a wide range of solubilities are sometimes listed for the same substance. Previously, the value of solubility limits at the mg/L level were not needed, nor was it possible to detect the quantities accurately. Static headspace has been used to determine the solubilities of compounds with even moderate volatility. The organic priority pollutants are a class of compounds where this information is not only useful but needed. The use of the headspace or vapor equilibration method to determine solubility limits has been developed. The developed method and the results of its use to determine the solubility limits of the twenty-six priority pollutants examined are presented.
Language: English
Format: Degree Work