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ISOLATION OF ORGANIC WATER POLLUTANTS BY XAD RESINS AND CARBON
Citation:
Rossom, P. AND R. Webb. ISOLATION OF ORGANIC WATER POLLUTANTS BY XAD RESINS AND CARBON. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-78/065.
Description:
The recovery efficiencies of XAD resins -2, -4, -7, and -8 and of resin mixtures were measured using distilled water samples containing 13 organic pollutants. An equal-weight mixture of XAD-4 and XAD-8 was most efficient. XAD-2 and XAD-4/8 were further tested and found effective using tapwater. Carbon was tested as a sorbent for materials not well retained by the resins. In-column solvent washing before sample sorption was found to be as effective as Soxhlet extraction for removing background impurities. Some compounds can be desorbed from carbon by in-column solvent elution; others require Soxhlet extraction. An XAD-4/8 column in series with a carbon column was used to sample 1000 liters of tapwater. Halomethanes, n-hydrocarbons, polynuclear aromatic compounds and dibenzofuran in the order of ng/l were identified using a gas chromatograph-mass spectrometer-computer system.