PCB partitioning

Although carvone has been shown to induce PCB degradation, it cannot act as a sole carbon source. Also, the PCBs partition to the organic fraction of the soil matrix and the bioavailability of PCBs to the degrader organism need to be increased. 

By analogy to the case in the water column, we can define an equilibrium constant reflecting PCB partitioning between the organism lipid pool and the sediment organic carbon pool ... 

Hi-vol estimates of Kp have been correlated to Koa on a log-log scale for several classes of compounds, demonstrating the general utility of Koa as a descriptor of particle / gas partitioning (Finizio et al., 1997 Figure 10.6). Moreover, Koa may be able to resolve the observed differences in speciation among compound classes that vapor pressure does not explain. The laboratory experiments of PCB partitioning to Chicago aerosol, supported this (Falconer et al., 1995). 

Horzempa, L.M.,DiToro,D.M. (1983) PCB partitioning in sedimemnt-water systems the effect of sediment concentration. J. Environ. Qual. 12, 373-380. 

Brown JF, Lawton RW. 1984. Polychlorinated biphenyl (PCB) partitioning between adipose tissue and serum. Bull Environ Contam Toxicol 33 277-280. 

Axelman, J., D. Broman C. Naf, 1997. Field measurements of PCB partitioning between water and planktonic organisms Influence of growth, particle size, and solute-solvent interactions. Environ. Sci.Technol. 31 665-669. 

The aim of the first example is to look for polychlorinated biphenyls (PCB) for which C-NMR spectra, measured in deuterochloroform, as well as the partition coefficients between 1-octanol and water arc known. Since it is not reliable to per-... 

As can be seen in Figure 5-17, some search fields (e.g., POW [= Power]) do not need any input in the search mask this means that all entries with any content of those Helds are retrieved. However, other fields always demand an input. In case the input is omitted (for example for the decadic logarithm of the partition coefficient), a corresponding error message results. Since the PCB are more soluble in the organic phase, the input of that Field is restricted to positive values. 

Results. Various solvent mixtures were tested for extraction efficiency. The test sample was a bone-dry sediment reference material containing 24.6 ppm of Arochlor 1242. This reference material is a real sediment from New Bedford Harbor which was homogenized and carefully assayed for PCB s by the Cincinnati EPA facility. Figure 3 shows recovery of 1242 using (1) hexane alone, (2) hexane and water (1 1), (3) hexane, water, and ethyl ether, (4) ethyl ether and water, (5) ethyl ether, water, and methanol, (6) methanol and hexane (1 1), and (7) water, methanol, and hexane (1 4 5). This last combination appears to give the best recovery. When added in this order to a dry sample, the effect of the water is to wet the sample, thus permitting extraction by methanol. The extracted PCB is partitioned almost exclusively into the hexane from the aqueous methanol. Final recovery is calculated from initial weight and hexane volume. 

Li YM, Jiang GB, Wang YW, Wang P, Zhang QH (2008) Concentrations, profiles and gas-particle partitioning of PCDD/Fs, PCBs and PBDEs in the ambient air of an e-waste dismantling area, southeast China. Chin Sci Bull 53(4) 521-528. doi 10.1007/sl 1434-008-0125-8... 

Hamer T. and Mackay, D. (1995) Measurement of octanol-air partition coefficients for chlorobenzenes, PCBs, and DDT. Environ. Sci. Technol. 29, 1599-1606. 

Tulp, M. T. M., Hutzinger, O. (1978) Some thoughts on the aqueous solubilities and partition coefficients of PCB, and the mathematical correlation between bioaccumulation and physico-chemical properties. Chemosphere 7, 849-860. 

Rapaport, R.A., Eisenreich, S. (1984) Chromatographic determination of octanol-water partition coefficients (KoW s) for 58 PCB congeners. Environ. Sci. Technol. 18, 163-170. 

Kaupp, K., McLachlan, M.S. (1999) Gas/particle partitioning of PCDDs/Fs, PCBs, PCNs and PAHs. Chemosphere 38, 3411-3421. 

Veith, G.D., Kosian, P. (1983) Estimating bioconcentration potential from octanolAvater partition coefficients. In Physical Behavior of PCBs in the Great Lakes. Mackay, D., Paterson, S., Eisenreich, S.J., Simmons, M.S., Editors, pp. 269-282, Ann Arbor Science Publishers, Ann Arbor, Michigan. 

Gundersen, D.T. and W.D. Pearson. 1992. Partitioning of PCBs in the muscle and reproductive tissues of paddlefish, Polyodon spathula, at the falls of the Ohio River. Bull. Environ. Contam. Toxicol. 49 455-462. 

Rowan, DJ. and J.B. Rasmussen. 1992. Why don t Great Lakes fish reflect environmental concentrations of organic contaminants An analysis of between-lake variability in the ecological partitioning of PCBs and DDT. Jour. Great Lakes Res. 18 724-741. 

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