Abstract:Polychlorinated biphenyls (PCB's) were detected in both the abiotic and biotic components of the Brisbane River estuary. Maximum average concentrations were detected in the muscle tissue of pelican (8.2 mg kg-1), gull (2.6 mg kg-1) and catfish (2.1 mg kg-1). Biomagnification was shown not to be a significant factor controlling PCB concentrations in the organisms investigated except in pelicans and gulls. In these cases, estimates of uptake from food sources indicated that biomagnification could be the major pr… Show more
“…Therefore, soil-to-plant translocation of the higher brominated PBDEs was more difficult. The molecular steric hindrance that limits penetration of cellular membranes by large organic compounds may also contribute to the lower uptake of the higher brominated PBDEs by plant roots (Shaw and Connel, 1982).…”
Section: Congener-specific Uptake Of Pbdes By Plant Rootsmentioning
Weathered PBDEs can be taken up by plants and lower brominated PBDEs are associated with higher bioavailability to plants and a higher dissipation in soils.a r t i c l e i n f o
a b s t r a c tPlant uptake and dissipation of weathered PBDEs in the soils of e-waste recycling sites were investigated in a greenhouse study. Eighteen PBDE congeners (tri-through deca-) were detected in the plant tissues. The proportion of lower brominated PBDEs (mono-through hexa-) in plant roots was higher than that in the soils. A concentration gradient was observed of PBDEs in plants with the highest concentrations in the roots followed by the stems and lowest in the leaves. Reduction rates of the total PBDEs in the soils ranged from 13.3 to 21.7% after plant harvest and lower brominated PBDEs were associated with a higher tendency to dissipate than the higher brominated PBDEs. This study provides the first evidence for plant uptake of weathered PBDEs in the soils of e-waste recycling sites and planting contributes to the removal of PBDEs in e-waste contaminated soils.
“…Therefore, soil-to-plant translocation of the higher brominated PBDEs was more difficult. The molecular steric hindrance that limits penetration of cellular membranes by large organic compounds may also contribute to the lower uptake of the higher brominated PBDEs by plant roots (Shaw and Connel, 1982).…”
Section: Congener-specific Uptake Of Pbdes By Plant Rootsmentioning
Weathered PBDEs can be taken up by plants and lower brominated PBDEs are associated with higher bioavailability to plants and a higher dissipation in soils.a r t i c l e i n f o
a b s t r a c tPlant uptake and dissipation of weathered PBDEs in the soils of e-waste recycling sites were investigated in a greenhouse study. Eighteen PBDE congeners (tri-through deca-) were detected in the plant tissues. The proportion of lower brominated PBDEs (mono-through hexa-) in plant roots was higher than that in the soils. A concentration gradient was observed of PBDEs in plants with the highest concentrations in the roots followed by the stems and lowest in the leaves. Reduction rates of the total PBDEs in the soils ranged from 13.3 to 21.7% after plant harvest and lower brominated PBDEs were associated with a higher tendency to dissipate than the higher brominated PBDEs. This study provides the first evidence for plant uptake of weathered PBDEs in the soils of e-waste recycling sites and planting contributes to the removal of PBDEs in e-waste contaminated soils.
“…Often, the organisms examined within a particular study did not fit in a logical food chain, with several organisms potentially occupying a given trophic level (e.g., Rosemarin et al 1985). Many studies made no effort to identify predator-prey relationships between organisms and trophic levels, making it difficult to determine whether or not contaminant trophic transfer was occurring (e.g., Klump and Peterson 1979;Ward et al 1986;Shaw and Connell 1982).…”
Section: Aquatic Food Web Biomagnificationmentioning
confidence: 99%
“…Pelagic fish species, such as tuna, contained, on average, higher tissue levels than cod, crustaceans (e.g., crab), and bivalves (e.g., mussels). Shaw and Connell (1982) examined a food web in the Brisbane River estuary (mussel-polychaete-erab-fishes) and found potential for PCB biomagnification (ITCs = 2.5 and 6.8).…”
“…In a number of cases the stepwise increase of contaminant concentration with increasing trophic level has been observed and cited as evidence for biomagnification (Woodwell 1967). However, there are many cases where food chains do not exhibit this phenomenon (Shaw and Connell 1982;Robinson et al 1967;Goldbach et al 1976). Other alternative explanations are possible.…”
Section: E Operation Of Biomagnification and Bioconcentration In Aqumentioning
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