PCBQ: Computerized quantification of total PCB and congeners in environmental samples

Capel, Paul D.; Rapaport, Robert; Eisenreich, Steven J.; Looney, B.B.

doi:10.1016/0045-6535(85)90238-3

Cited by 85 publications

(30 citation statements)

References 21 publications

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“…Identi®cation of the compounds was based on the selected-ion monitoring (SIM) mode of the GC/MS using two most abundant ions of PCBs molecular ion clusters. Congener was identi®ed by comparison to published Arcolor mixtures chromatograms (Capel et al, 1985).…”

Section: Methodsmentioning

confidence: 99%

Mechanism of PCBs formation from the pyrolysis of chlorobenzenes

et al. 2001

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Section: Methodsmentioning

confidence: 99%

Mechanism of PCBs formation from the pyrolysis of chlorobenzenes

et al. 2001

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“…All solvents were glass capillary gas chromatograph confirmed the degree of chlorination of the various peaks. GC and GCMS identifications reported by other workers, using SE-54 and similarly coated columns, were consulted to obtain a consistent set of peak identifications (Albro and Parker, 1979;Ballschmiter and Zell, 1980;Albro et al, 1981;Duinker and Hillebrand, 1983;Mullin et al, 1984;Capel et al, 1985). The relative amounts of contributing congeners in some unresolved peaks is still tentative, but does not affect the identifications of major peaks or interpretation of results given here.…”

Section: Analytical Methods and Calculationsmentioning

confidence: 99%

“…There are 209 possible chlorobiphenyl congeners, and nearly half of them have been identified in commercial mixtures and environmental samples (Ballschmiter and Zell, 1980;Duinker and Hillebrand, 1983;Capel et al, 1985). PCBs were commercially produced in this country by Monsanto Corporation and sold as complex mixtures which are viscous liquids under the trade name Aroclor.…”

Section: Polychlorinated Biphenyls As Model Hocmentioning

confidence: 99%

The role of colloidal organic matter in the marine geochemistry of PCBs

Brownawell¹

1986

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WITHDRAWN AD -sT~i~Bñ~c i~tZ4-2-ABSTRACT Polychlorinated biphenyls (PCBs) were used as model hydrophobic organic compounds (HOC) to study physical-chemical processes which affect the speciation and fate of HOC in coastal environments. The focus of this study is on the sorption of PCBs with colloidal organic matter in seawater, and the influence of this process on the distribution of PCBs in coastal sediments. Laboratory and field experiments were used to make quantitative estimates of PCB-organic matter sorption, and to test predictions of three-phase equilibrium models.A static headspace partitioning method was developed to measure the sorption of several individual chlorobiphenyls with colloidal organic matter enriched from coastal seawater by hollow fiber ultrafiltration. This technique directly measured the dissolved phase fugacity of PCBs in experimental bottles, and avoided uncertain separation techniques often used in isolating various chemical phases. Colloidal organic carbon normalized partition coefficients (Koc) were determined from linear sorption isotherms, and increased from 1.9 x 10' (L/Kg) for 2,4'-dichlorobiphenyl to 3.5 x 10 s for 2,2',3,4,5'-pentachlorobiphenyl. Sorption tended to increase with increasing octanol-water partition coefficients (Kow) of the sorbate, and values of Koc were within a range of those reported in other experimental sorption studies with sediments and dissolved humic substances. Experimental partitioning results support the hypothesis that HOC-organic colloid sorption is similar to HOC sorption by sediment organic matter.PCBs were measured in the interstitial waters and sediments of three box cores obtained from New Bedford Harbor and Buzzards Bay, Massachusetts. The three sites studied had a wide range of sediment PCB concentrations, and reducing conditions provided environments containing high concentrations of colloidal organic matter. Dissolved organic carbon (DOC) and total sediment organic carbon (TOC) were measured in two cores to test the role of organic matter on the observed partitioning of PCBs. PCB concentrations, particularly those of less soluble chlorobiphenyls, were highly elevated in interstitial waters compared to water column concentrations at all three sites. The measured apparent distribution coefficients (K'd) of individual chlorobiphenyls did not increase with hydrophobicity (Kow) and indicate that a large fraction of PCBs in interstitial waters must be sorbed to organic colloids. A three-phase equilibrium sorption model, in which dissolved PCBs are in a dynamic equilibrium with colloidal and sediment organic matter, accounts for many aspects of the field data. There is good agreement of observed partitioning at New Bedford Station 67 and Buzzards Bay Station M with model calculations based on predictions derived from laboratory experiments of HOC sorption with sediments and organic colloids, but model calculations underpredict K'd at Station 84 in New Bedford Harbor.-3-The sediment-interstitial water results were contrasted with a study of PCB pa...

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“…Congener was identified by comparison to published Arcolor mixtures chromatograms (Capel et al 1985) and relative retention time of PCB congeners (Mullin et al1984). Identification of the compounds was based on the selected-ion monitoring (SIM) mode of the GC/MS using two most abundant ions of the molecular ion clusters.…”

Section: Methodsmentioning

confidence: 99%