title: Comparison of PoraPak Rxn RP and XAD-2 adsorbents for monitoring dissolved hydrophobic organic contaminants.
abstract: Accurate determination of the levels of dissolved hydrophobic organic contaminants (HOCs) is an important step in estimating the dynamics of their inputs and losses in aqueous systems. This study explores an alternative method for efficiently sampling dissolved HOCs while mitigating a number of sampling artifacts associated with traditional methods. The adsorption characteristics of a new polymeric resin, PoraPak Rxn RP (PPR), were assessed using sorption isotherm experiments and fixed bed adsorption studies. The adsorption capacities and breakthrough times for four model contaminants (phenol, p-nitrophenol, naphthalene, and 2,4,6-tribromophenol) were proportional to the contaminant's hydrophobicity. The ability of PPR to isolate dissolved polychlorinated biphenyls (PCBs) in real samples was compared with that of XAD-2, a well-known macroporous polymer that suffers from high background contamination. The results indicated that the PPR resin can be effectively used for monitoring HOCs, with low ∑PCB levels in blanks, decreasing solvent use, and reducing extraction times.
authors.affiliation: Center for Air Resources Engineering and Science, Clarkson University, P.O. Box 5708, Potsdam, NY, 13699, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Omara
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Holsen
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Xia
authors.forename: James J
authors.initials: JJ
authors.lastname: Pagano
authors.forename: Bernard S
authors.initials: BS
authors.lastname: Crimmins
authors.forename: Philip K
authors.initials: PK
authors.lastname: Hopke
mesh_terms: D000327:Adsorption; D004784:Environmental Monitoring / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D011078:Polychlorinated Biphenyls / Q000032:analysis; D011137:Polystyrenes / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*
chemical_list: D011137:Polystyrenes; C000594076:PoraPak Rxn RP; D012117:Resins, Synthetic; C003771:Amberlite XAD-2 resin; D011078:Polychlorinated Biphenyls
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