Nonconstant polychlorinated biphenyl partitioning in New Bedford Harbor sediment during sequential batch leaching

Brannon, James M.; Myers, Tommy E.; Gunnison, Douglas; Price, Cynthia B.

doi:10.1021/es00018a010

Cited by 31 publications

(8 citation statements)

References 19 publications

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“…Most existing experimental data examining the chemical behavior of coplanar congeners indicate that their physicochemical properties are similar to those of nonplanar PCB congeners within the same homologue group. Brannon et al [13] did not report any appreciable difference in the sequential batch leaching of New Bedford Harbor sediment for CB077 compared to other congeners. Borgmann et al [28] found that adsorption of CB052 and CB077, nonplanar and coplanar homologues, to cotton gauze was not different, suggesting that the adsorption characteristics of the two congeners to organic matter are similar.…”

Section: Discussionmentioning

confidence: 92%

“…Furthermore, it has been reported that coplanar PCBs may have different bioaccumulative properties than nonplanar congeners with the same number of chlorines [4,11,12]. In the marine environment, coplanar PCBs have been studied in sediment [13,14], oysters [4,15], mussels [11,[14][15][16], fish [14][15][16], and marine mammals [8,[17][18][19][20]. Environmental coplanar PCB concentrations are generally higher than dioxin [11], have demonstrated toxicity, and have been shown to be widespread on a global scale [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of nonplanar and coplanar PCB congener partitioning in seawater and bioaccumulation in blue mussels (Mytilus edulis)

Bergen¹,

Nelson²,

Pruell³

1996

Enviro Toxic and Chemistry

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The partitioning of 18 nonplanar and three coplanar (International Union of Pure and Applied Chemistry [IUPAC] numbers 77, 126, and 169) polychlorinated biphenyl (PCB) congeners was quantified in New Bedford Harbor, Massachusetts, USA. Concurrently, bioaccumulation of these congeners was measured in blue mussels deployed for 7 and 28 d in New Bedford Harbor, and bioconcentration factors (BCFs) were calculated for each congener. The PCB concentrations measured in the dissolved and particulate fractions of seawater samples were used to calculate partition coefficients (Kp) for each congener. These values were correlated with reported octanol/water partition coefficients (Kow). No significant differences (p > 0.05) were observed in the relationships between Kp and Kow for the coplanar congeners relative to the nonplanar congeners. Coplanar congeners reached steady state faster than the nonplanar congeners; however, after 28 d a similar relationship was observed between BCF and Kow in coplanar and nonplanar congeners. These data indicate that coplanar PCBs partition in seawater and accumulate in mussels similarly to nonplanar PCBs with the same number of chlorines.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Comparison of nonplanar and coplanar PCB congener partitioning in seawater and bioaccumulation in blue mussels (Mytilus edulis)

Bergen¹,

Nelson²,

Pruell³

1996

Enviro Toxic and Chemistry

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“…Isotherms with nonconstant Kd are primarily observed during leaching of estuarine sediments Brannon, Myers, and Price 1990;Brannon et al 1991). Nonconstant contaminant partitioning yields an isotherm for which the distribution coefficient changes as the solid phase concentration q decreases during sequential leaching until a turning point is reached (Figure 6).…”

Section: Nonconstant Gdmentioning

confidence: 99%

“…According to the Gouy-Chapman model of charge distribution in double layers, decreasing the ionic strength increases repulsive forces (Stumm and Morgan 1981) so that flocculated colloidal matter becomes dispersed. Deflocculation of sediment organic carbon increases the concentration of dissolved organic carbon (DOC) in the aqueous phase, mobilizing metals and organic contaminants bound to the colloidal matter (Brannon et al 1991). For these reasons, the type of desorption isotherm shown in Figure 6 is referred to as a DOC-facilitated desorption isotherm.…”

Section: Nonconstant Gdmentioning

confidence: 99%

“…The effects of liquid-solid ratio, kinetics, and oxidation status of the sediment during leaching have been discussed in detail in Myers and Brannon (1988b); Brannon et al (1989);Brannon, Myers, and Price (1990); Myers and Brannon (1991);Myers, Brannon, and Price (1992); and Myers and Brannon (1993). Therefore, only a brief summary of the impacts of each of these factors and the reasons for choosing the recommended technique will be discussed.…”

Section: Recommended Proceduresmentioning

confidence: 99%

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Leachate Testing and Evaluation for Freshwater Sediments. Long-Term Effects of Dredging Operations Program

Myers¹,

Brannon²,

Tardy³

et al. 1994

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Fate and transport of pcbs at the new bedford harbor superfund site

Garton¹,

Bonner²,

Ernest³

et al. 1996

Enviro Toxic and Chemistry

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Abstract-A unique, holistic modeling approach, combining theoretical, empirical, and deterministic elements, was developed to define the ambient background transport of polychlorinated biphenyl (PCB) from New Bedford Harbor, to provide a baseline for remediation assessment of this Superfund site. Both empirical and deterministic elements characterized sediment processes. The deterministic section employed experimental data to describe flocculation through fluid shear, differential settling, and Brownian motion mechanisms, yielding a sediment settling velocity. The empirical portion of the model used this settling velocity, along with suspended solids, and flow field data to characterize sediment action. The remaining PCB transport mechanisms (volatilization and sorption) are theoretically considered to give a complete contaminant transport assessment. The PCBs in New Bedford Harbor tend to volatilize at the rate of 5.9 g/d; or sorb, with sorption coefficients increasing with percent chlorination from 10 Ϫ2.2 to 10 Ϫ0.4 m 3 /g for Aroclors 1016 and 1260, respectively, rather than stay in solution. The deterministic model showed that fluid shear was the most significant flocculation mass removal mechanism contributing to the settling velocity calculation. From the empirical model, the dominant sediment action mechanisms, resuspension and deposition, were driven by the change in suspended solids concentration and tides. The cycling of PCB-laden sediment, indicated by the PCB sorption tendency and the presence and dominance of resuspension, and subsequent transport from the site, can lead to PCB contamination of the water column, atmosphere, or downstream (marine) areas.

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Nonconstant polychlorinated biphenyl partitioning in New Bedford Harbor sediment during sequential batch leaching

Cited by 31 publications

References 19 publications

Comparison of nonplanar and coplanar PCB congener partitioning in seawater and bioaccumulation in blue mussels (Mytilus edulis)

Comparison of nonplanar and coplanar PCB congener partitioning in seawater and bioaccumulation in blue mussels (Mytilus edulis)

Leachate Testing and Evaluation for Freshwater Sediments. Long-Term Effects of Dredging Operations Program

Fate and transport of pcbs at the new bedford harbor superfund site

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