Polyhalogenated carbazoles in sediments from Lake Tai (China): Distribution, congener composition, and toxic equivalent evaluation

2017 ◽  
Vol 220 ◽  
pp. 142-149 ◽  
Author(s):  
Yan Wu ◽  
Yanling Qiu ◽  
Hongli Tan ◽  
Da Chen
Keyword(s):  
Toxic Equivalent

Hepatic 7-ethoxyresorufin-O-deethylase activity, plasma steroid hormone concentrations, and liver bioassay-derived 2,3,7,8-TCDD toxic equivalent concentrations in wild white sucker (Catostomus commersoni) caged in bleached kraft pulp mill effluent

1995 ◽  
Vol 52 (7) ◽  
pp. 1339-1350 ◽  
Author(s):  
M. R. van den Heuvel ◽  
D. G. Dixon ◽  
K. R. Munkittrick ◽  
M. R. Servos ◽  
G. J. Van Der Kraak
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Pulp Mill Effluent ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Rapid Reduction ◽  
Handling Stress ◽  
Toxic Equivalent ◽  
Kraft Pulp Mill ◽  
Bleached Kraft Pulp

Prespawning male white sucker (Catostomus commersoni), captured near Jackfish Bay, Lake Superior (exposed to bleached kraft pulp mill effluent (BKME)), and Mountain Bay (reference) were caged in the BKME receiving area for 2, 4, and 8 d. Initially, the hepatic 7-ethoxyresorufin-O-deethylase activity was similar in fish from both BKME and reference sites and, upon BKME exposure, increased 20-fold at both sites after 2 d. The H4IIE cell culture bioassay was used to measure 2,3,7,8-tetrachlorodibenzo-p-dioxin toxic equivalent concentration (TEC) in sucker liver extracts. H4IIE bioassay-derived TECs from Jackfish Bay sucker showed no significant treatment differences; combined TECs for all treatments averaged 51.1 pg∙g−1. Mountain Bay sucker liver TECs were initially significantly less (4.64 pg∙g−1) than the Jackfish Bay TECs but did show a significant, fivefold increase when fish were exposed to effluent. Mountain Bay and Jackfish Bay 8-d BKME-exposed fish showed no uptake of TECs calculated from directly measured polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) during this exposure. The results suggest that PCDDs and PCDFs are not responsible for the mixed function oxidase induction observed. Handling stress caused rapid reduction of the plasma steroids testosterone and 11-ketotestosterone, confounding any possible BKME effect.

Polychlorinated Biphenyls and Polychlorinated Dioxins–Furans in Lake Trout and Whitefish Composite Samples from Commercial Fisheries in Lakes Erie, Huron, and Superior

2017 ◽  
Vol 80 (8) ◽  
pp. 1228-1238 ◽  
Author(s):  
Dorothea F. K. Rawn ◽  
Michael Dowd ◽  
Matthew J. S. Scuby ◽  
Peter P. Pantazopoulos ◽  
Mark Feeley
Keyword(s):  
Polychlorinated Biphenyls ◽  
Lake Trout ◽  
Lake Huron ◽  
Coregonus Clupeaformis ◽  
Spearman Correlation ◽  
Toxic Equivalent ◽  
Time Period ◽  
Commercially Important ◽  
Insight Into ◽  
Composite Samples

ABSTRACT Polychlorinated biphenyls (PCBs; sum of 36 congeners) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs; sum of 17 2,3,7,8-substituted congeners) were measured in 93 composite samples prepared from individual lake trout (Salvelinus namaycush) and whitefish (Coregonus clupeaformis) samples collected from Lake Erie, Lake Huron, and Lake Superior. All samples had detectable concentrations of PCBs and PCDD/Fs; maximum PCB concentrations in both trout (750 ng g−1 whole weight [ww]) and whitefish (210 ng g−1 ww) were found in composites from fish collected from Lake Huron. The maximum toxic equivalent concentration was found in a lake trout composite sample from Lake Huron (53 pg g−1 ww). PCB and PCDD/F congener profiles were comparable to patterns observed in fishes collected from other regions of Canada, although concentrations were above those found in other regions. A positive correlation was found between PCB concentrations determined using the historical Aroclor equivalency method and those determined using the sum of the congeners measured (r2 = 0.871; Spearman correlation r = 0.917) or using the six indicator PCB congeners (28, 52, 101, 138, 153, and 180; r2 = 0.850; Spearman correlation r = 0.935). PCBs were the dominant contributor to the overall toxic equivalent concentrations in the fish composite samples tested. These findings provide insight into PCB and PCDD/F concentrations in two commercially important fish species over a discrete time period.

Toxic equivalent concentrations (TEQs) for baseline toxicity and specific modes of action as a tool to improve interpretation of ecotoxicity testing of environmental samples

2008 ◽  
Vol 10 (5) ◽  
pp. 612 ◽  
Author(s):  
Beate I. Escher ◽  
Nadine Bramaz ◽  
Jochen F. Mueller ◽  
Pamela Quayle ◽  
Sibylle Rutishauser ◽  
...  
Keyword(s):  
Environmental Samples ◽  
Toxic Equivalent ◽  
Modes Of Action ◽  
Ecotoxicity Testing
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