Comparison of the effects of acute and subchronic administration of aroclor 1254, a commercial mixture of polychlorinated biphenyls, on pentobarbital‐induced sleep time and [14c]pentobarbital disposition in mice

The degradation of a mixture of hydroxy- and methoxy-PCB obtained as a result of a chemical modification of a commercial mixture of PCB «Sovol» by the Rhodococcus wratislaviensis strain KT112-7 in plankton culture or immobilized on carbon carriers has been investigated. It was established that the KT112-7 strain in plankton culture degraded 73.2% of a mixture of modified PCBs for 96 h; the strain immobilized on BAU-A activated carbon and on Carbopon-B-active carbon fiber provided the 59.5% and 95.3% degradation for the same time, respectively (with the starting concentration of PBS of 0.5 g/L). The application of the R. wratislaviensis KT112-7 strain immobilized on the BAU-A carrier decreased the number of the PCB derivatives by 1.5 times at the end of the experiment; the corresponding result for the Carbopon-B-active-immobilized culture was 3 times; the set of PCBs after the treatment with the suspension culture remained unchanged. In practice, the immobilization of R. wratislaviensis КТ112-7 strain on carbon carriers can be used in the development of the techniques for the degradation of chemically modified PCB mixtures. polychlorinated biphenyls, immobilization, destruction, utilization, PCB, Rhodococcus. Funding-This work was supported by the Integrated Program of the Ural Branch of the Russian Academy of Sciences No. 18-3-8-19. The work was performed using the equipment of the Center for collective use «Spectroscopy and analysis of organic compounds».

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Leaching Rate of Polychlorinated Biphenyls (PCBs) from Marine Paint Chips

Archives of Environmental Contamination and Toxicology ◽

10.1007/s00244-021-00868-6 ◽

2021 ◽

Author(s):

Allen D. Uhler ◽

Jeffery H. Hardenstine ◽

Deborah A. Edwards ◽

Guilherme R. Lotufo

Keyword(s):

Polychlorinated Biphenyls ◽

Surface Waters ◽

Leaching Rate ◽

Short Term ◽

Aroclor 1254 ◽

Maintenance And Repair ◽

Potential Source ◽

Vessel Bottom ◽

Dissolved Phase ◽

Over Time

AbstractPolychlorinated biphenyls (PCBs) were added to certain marine vessel bottom paints as a plasticizer to improve the adhesion and durability of the paint. The most common PCB formulation used to amend such paints was Aroclor 1254. Fugitive Aroclor-containing paint chips generated from vessel maintenance and repair operations represent a potential source of PCB contamination to sediments. Limited published studies indicate that Aroclor-containing paint is largely inert and exhibits low PCB leaching into water; however, the rate and degree of leaching of PCBs from paint chips have not been directly studied. This laboratory-based study evaluated the rate and extent of leaching of PCBs from paint chips into freshwater. The results of this investigation demonstrate that the rate of PCB dissolution from paint chips decreased rapidly and exponentially over time. Based on this study, it is estimated that the rate of leaching of PCBs from paint chips would cease after approximately 3 years of exposure to water. When all leachable PCBs were exhausted, it is estimated that less than 1% of the mass of PCBs in the paint chips was amenable to dissolution. The results of this experiment suggest that Aroclor-containing paint chips found in sediments are likely short-term sources of dissolved-phase PCB to pore or surface waters and that the majority of the PCBs in paint chips remain in the paint matrix and unavailable for partitioning into water. Graphic Abstract

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Biological activity associated with noncoplanar polychlorinated biphenyls after microbial dechlorination of aroclor 1242® and aroclor 1254®

Environmental Toxicology and Chemistry ◽

10.1002/etc.5620190513 ◽

2000 ◽

Vol 19 (5) ◽

pp. 1311-1316 ◽

Cited By ~ 5

Author(s):

Patricia E. Ganey ◽

John F. Quensen ◽

Mahmoud A. Mousa ◽

Stephen A. Boyd ◽

Margaret A. Wagner ◽

...

Keyword(s):

Biological Activity ◽

Polychlorinated Biphenyls ◽

Aroclor 1254 ◽

Aroclor 1242 ◽

Microbial Dechlorination

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Promoting Effects of Polychlorinated Biphenyls (Aroclor 1254) and Polychlorinated Dibenzofuran-Free Aroclor 1254 on Diethylnitrosamine-Induced Tumorigenesis in the Rat23

JNCI Journal of the National Cancer Institute ◽

10.1093/jnci/66.3.509 ◽

1981 ◽

Keyword(s):

Polychlorinated Biphenyls ◽

Aroclor 1254 ◽

Polychlorinated Dibenzofuran

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Levels of Polychlorinated Biphenyls and Pesticides in Bluefish Before and After Cooking

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/72.3.501 ◽

1989 ◽

Vol 72 (3) ◽

pp. 501-503

Author(s):

William J Trotter ◽

Paul E Corneliussen ◽

Ronald R Laski ◽

Joseph J Vannelli

Keyword(s):

Polychlorinated Biphenyls ◽

Moisture Loss ◽

Aroclor 1254 ◽

Weight Losses ◽

Before And After

Abstract Similar levels of polychlorinated biphenyls (PCBs), pesticides, and fat were found in 20 correlated uncooked and cooked (baked) bluefish fillets. Fillets averaged 2.5 ppm PCBs as Aroclor 1254 (whole basis) before cooking; after cooking, with the oil drippings and skin discarded, the average PCB level was 2.7 ppm. Although PCBs, lipophilic pesticides, and fat were lost along with oil drippings and skin that were discarded after cooking, the moisture loss in the fillets during cooking compensated for these weight losses almost completely. After the fillets were cooked and the oil drippings and skin were discarded, the PCB content of the fillets was 27% lower on the average.

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