Sources and dechlorination of polychlorinated biphenyl congeners in the sediments of Fox River, Wisconsin

İmamoğlu, İpek
Chrıstensen, Er
Mcmullın, Jk
Polychlorinated biphenyl (PCB) congeners were analyzed in eight deep, dated sediment cores collected from the immediate upstream and downstream of DePere dam in Fox River, Wisconsin. The average time span of the cores is about 100 yr, except for one core (FR-9) which is influenced by mixing or covers a short time period (2 yr). The total PCB concentrations have a range of 0.2-6.8 ppm for the upstream and 0.3-17.6 ppm for the downstream cores. The PCB data obtained from the sampling were analyzed as upstream and downstream data, using a factor analysis (FA) model with nonnegative constraints to identify PCB sources and congener patterns. The factor loadings obtained from the FA model were interpreted in terms of the presence of possible environmental degradation mechanisms. In addition, a recently developed model, which is used to identify and quantify possible pathways of anaerobic dechlorination of PCBs in the sediments, was validated on the basis of in situ data from the literature, and then applied to the congener patterns obtained from the FA model. The major PCB source to the Fox River sediments is identified as Aroclor 1242, for both the upstream and the downstream sediments. Loss of di- and trichlorobiphenyls (e.g., 2-4, 25-2) from the sediments suggests desorption from the sediments. On the other hand, observation of elevated amounts of certain congeners such as 24-3 and 25-3 indicates the presence of anaerobic dechlorination activity. The anaerobic dechlorination model demonstrates significant similarities between the Aroclor 1242 profile altered according to dechlorination processes Q (upstream) and H' (downstream) and the dominant congener patterns obtained from the FA model.


Distribution of tin in the northeastern Mediterranean
Yemeni̇ci̇ğlu, Semal; Saydam, Cemal; Sali̇hoğlu, İlkay (Elsevier BV, 1987)
Concentrations of tin, one of the naturally methylated elements, was determined in sea water, sediments and organisms, collected from the Northeastern Mediterranean. A hydride generation technique was employed, in which the tin and methyltin, were converted to their hydrides. The hydrides produced were detected by atomic absorption spectrophotometer. On the average, the inorganic tin content of sea water samples ranged between 1.1–236 ng/1. Although the dominant methyltin species was dimethyltin, all forms ...
CABBAR, C; DOGU, G; Doğu, Timur; MCCOY, BJ; SMITH, JM (American Chemical Society (ACS), 1994-07-01)
The single-pellet moment technique was shown to be a powerful method for investigating the diffusion and adsorption of volatile hydrocarbons in the soil. The technique was used to evaluate effective diffusivities, adsorption equilibrium, and rate constants of chlorinated hydrocarbons (monochloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2-trichloroethane). Results obtained in a dry system showed that adsorption rate constants of all these hydrocarbons on the soil pellet used are of the same ...
Long term impact of dissolved dispersed petroleum hydrocarbons (DDPH) in Gulf of Iskenderun
Salİhog̈lu, İlkay; Saydam, Deniz; Yilmaz, Ayşen (Elsevier BV, 1987)
DDPH in sea water, polyaromatic hydrocarbons (PAH's) in sediment and in some marine biota were monitored for the period of August 1981 and April 1984. Maximum DDPH was measured in winter and minimum in summer. This phenomena showed an inverse relation with the sea water temperature. Increase in sea water DDPH concentration reflected itself immediately in fish liver but two months time lack between fish liver and flesh was observed. GLC analysis results of sea water extracts and various crude oil showed t...
2 toxicants, mercury and tin in the Gulf of Iskenderun
Salihoğlu, Barış; Yemeni̇ci̇og̈lu, Semal (Elsevier BV, 1987)
The concentrations of total mercury and tin in the sediment samples collected from İskenderun bay were determined by utilizing atomic absorption spectrophotometer. Mercury concentration of the samples was determined by cold vapor, and tin concentration by hydride generation techniques. The highest mercury concentrations were measured infront of İSDEMİR (Iron and stell complex) with a value of 550 μg/g (dry weight). The mercury concentrations were found to decrease with distance from the shore. Sediment samp...
Levels and sources of polychlorinated biphenyls in Ankara creek sediments, Turkey
Ozyurek, Nazan Akduman; Gedik, Kadir; Sıltu, Esra; İmamoğlu, İpek (Informa UK Limited, 2013-06-01)
The spatial distribution, degree of pollution and major sources of polychlorinated biphenyls (PCBs) were evaluated in surficial sediments of Ankara Creek, located in the capital of Turkey and serving as one of the tributaries in the third largest watershed in Turkey. Sediment sigma PCB concentrations analyzed on Aroclor and congener basis (seven indicator congeners) range from 5.5 to 777.6ng g1 and 3.7 to 743.3ng g1 dw as Aroclor and congener based concentrations, respectively. High concentrations of sigma ...
Citation Formats
İ. İmamoğlu, E. Chrıstensen, and J. Mcmullın, “Sources and dechlorination of polychlorinated biphenyl congeners in the sediments of Fox River, Wisconsin,” ENVIRONMENTAL SCIENCE & TECHNOLOGY, pp. 2574–2583, 2004, Accessed: 00, 2020. [Online]. Available: