Survey of receiving‐water environmental impacts associated with discharges from pulp mills: 4. Bioassay‐derived 2,3,7,8‐tetrachlorodibenzo‐P‐dioxin toxic equivalent concentration in white sucker (catostomus commersoni) in relation to biochemical indicators of impact

Abstract The H4IIE rat hepatoma bioassay was used to measure 2,3,7,8-tetrachlorodibenzo-p-dioxin toxic equivalent concentrations (TECs) in livers of white sucker (Catostomus commersom) collected downstream from eight Ontario pulp mills and five reference sites. Subsamples of liver were also chemically analyzed for dioxins and furans. Bioassay-derived TECs were compared with TECs calculated from chemical residues using toxic equivalency factors …