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Titolo:
Biogeochemical cycling of PCBs in lakes of variable trophic status: A paired-lake experiment
Autore:
Jeremiason, JD; Eisenreich, SJ; Paterson, MJ; Beaty, KG; Hecky, R; Elser, JJ;
Indirizzi:
Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08903 USA RutgersState Univ New Brunswick NJ USA 08903 New Brunswick, NJ 08903 USA Fisheries & Oceans Canada, Inst Freshwater, Winnipeg, MB R3T 2N6, Canada Fisheries & Oceans Canada Winnipeg MB Canada R3T 2N6 , MB R3T 2N6, Canada Environm Canada, Natl Water Res Inst, Burlington, ON L7R 4A6, Canada Environm Canada Burlington ON Canada L7R 4A6 rlington, ON L7R 4A6, Canada Arizona State Univ, Dept Zool, Tempe, AZ 85287 USA Arizona State Univ Tempe AZ USA 85287 niv, Dept Zool, Tempe, AZ 85287 USA
Titolo Testata:
LIMNOLOGY AND OCEANOGRAPHY
fascicolo: 3, volume: 44, anno: 1999,
parte:, 2
pagine: 889 - 902
SICI:
0024-3590(199905)44:3<889:BCOPIL>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYCYCLIC AROMATIC-HYDROCARBONS; SEDIMENT TRAP FLUXES; HENRY LAW CONSTANTS; POLYCHLORINATED-BIPHENYLS; GREAT-LAKES; CHLORINATED HYDROCARBONS; ORGANOCHLORINE COMPOUNDS; PRECAMBRIAN SHIELD; ORGANIC-CHEMICALS; MEDITERRANEAN-SEA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Eisenreich, SJ Rutgers State Univ, Dept Environm Sci, POB 231, New Brunswick, NJ 08903 USA Rutgers State Univ POB 231 New Brunswick NJ USA 08903 3 USA
Citazione:
J.D. Jeremiason et al., "Biogeochemical cycling of PCBs in lakes of variable trophic status: A paired-lake experiment", LIMN OCEAN, 44(3), 1999, pp. 889-902

Abstract

A paired whole-lake experiment was conducted on two remote, atmospherically driven lakes in the Experimental Lakes Area (ELA) to examine the stressesof trophic condition on air-water exchange and settling fluxes of polychlorinated biphenyls (PCBs). Lake 227 (L227) and Lake 110 (L110) are similar in volume, surface area, and watershed area but differ significantly in trophic status. The two lakes have similar access to atmospheric PCBs but eutrophic L227 may exhibit enhanced air to water exchange due to greater biotic uptake of dissolved PCBs. Settling fluxes of PCB were significantly greaterin eutrophic L227 (40 ng m(-2) d(-1) in 1993; 29 ng m(-2) d(-1) in 1994) than in oligotrophic L110 (22 ng m(-2) d(-1) in 1993 and 17 ng m(-2) d(-1) in 1994). Dissolved Sigma PCB concentrations were not significantly different in the two lakes (similar to 0.3 ng liter(-1)). Greater Sigma PCB settling fluxes in L227 vs. L110 coupled with similar dissolved concentrations after June supports the hypothesis that air-water exchange supports the water column PCB concentrations. Surprisingly, Sigma PCB fugacity gradients in both lakes indicated that net volatilization dominated during the entire ice-free period, requiring another source. A Sigma PCB mass budget in the epilimnion of each lake over the stratified period showed that the major PCB losses were due to settling and volatilization. Sigma PCB settling losses were2.4 times greater in L227 than in L110 due to higher settling particle fluxes. The mass budgets suggest that the major PCB input to these remote lakes is from the watershed. Our results indicate the intimate environmental linkage between atmospheric, land, and aquatic PCB reservoirs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:17:45