Relationship between PCBs in suspended and settled sediments from a coastal lagoon

Polychlorinated biphenyl (PCB) congener concentrations and organic matter content were determined in 84 samples of suspended and settled sediments collected from six different locations in the Ria Formosa lagoon (Portugal). Total PCB (tPCB) concentrations were higher in the suspended matter (1.00–39...

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मुख्य लेखकों: Barreira, LA, Bebianno, MJ, Mudge, SM, Ferreira, AM, Albino, CI, Veriato, LM
स्वरूप: info:eu-repo/semantics/article
भाषा:eng
प्रकाशित: Iniversidad Autónoma de Baja California 2005
विषय:
PCB
ऑनलाइन पहुंच:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/97
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spelling repositorioinstitucional-20.500.12930-73402023-05-09T14:30:48Z Relationship between PCBs in suspended and settled sediments from a coastal lagoon Relación entre PCBs en sedimentos suspendidos y depositados de una laguna costera Barreira, LA Bebianno, MJ Mudge, SM Ferreira, AM Albino, CI Veriato, LM PCB congeners sediments coastal lagoons Ría Formosa PCBs congéneres sedimentos lagunas costera Ría Formosa Polychlorinated biphenyl (PCB) congener concentrations and organic matter content were determined in 84 samples of suspended and settled sediments collected from six different locations in the Ria Formosa lagoon (Portugal). Total PCB (tPCB) concentrations were higher in the suspended matter (1.00–39.80 ng g–1 dw) than in the sediments (0.10–2.10 ng g–1 dw) and, in general, the same was true for the organic matter. Partial least squares (PLS) analysis using the suspended sediments as signatures indicated that they better explained the settled sediment pattern compared to the reverse. This suggests a suspended sediment source outside the lagoon as source of these PCBs. PLS analysis also indicated that Aroclor 1242 best explained the congener pattern in the sediments, but lower fits were obtained for the suspended matter. The tri- and tetra-chlorinated biphenyls were the most abundant congeners (about 60% of tPCB), followed by the hexa- (20%), penta- (11%) and hepta + octa-chlorobiphenyls (9%). The principal congener differences between the suspended and settled sediments were for the smaller tri- and tetrachlorinated biphenyls, which were preferentially accumulated in the settled sediments. In contrast, congener 49 was significantly more abundant in the suspended phase and may be formed through the anaerobic UV degradation pathway either in suspension or on the surface of strongly anoxic sediments at low tide. Se determinaron las concentraciones de congéneres de bifenilos policlorados (PCBs) y el contenido de materia orgánica en 84 muestras de sedimentos suspendidos y depositados, recolectadas de seis localidades diferentes de una laguna costera (Ría Formosa, Portugal). Las concentraciones totales de PCB (tPCB) fueron mayores en el material suspendido (1.00–39.80 ng g–1 ps) que en los sedimentos depositados (0.10–2.10 ng g–1 ps) y, en general, lo mismo fue cierto para la materia orgánica. El análisis de cuadrados mínimos parciales usando los sedimentos suspendidos como huellas indicó que éstos explican mejor el patrón de los sedimentos depositados que al revés. Esto sugiere una fuente de sedimento suspendido afuera de la laguna como fuente de estos PCBs. El análisis de cuadrados mínimos parciales también mostró que el Aroclor 1242 explicó mejor el patrón de congéneres en los sedimentos, pero se obtuvieron ajustes menores para el material suspendido. Los bifenilos triclorados y tetraclorados fueron los congéneres más abundantes (alrededor de 60% del tPCB), seguidos por los bifenilos hexaclorados (20%), pentaclorados (11%) y hepta + octaclorados (9%). Las principales diferencias de congéneres entre los sedimentos suspendidos y los depositados correspondieron a bifenilos triclorados y tetraclorados, que fueron acumulados preferencialmente en los sedimentos depositados. En contraste, el congénere 49 resultó significativamente más abundante en la fase suspendida y puede formarse por degradación anaerobia por irradiación UV, ya sea en suspensión o en la superficie de sedimentos altamente anóxicos durante la marea baja. 2005-03-06 2021-06-03T03:54:58Z 2021-06-03T03:54:58Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/97 10.7773/cm.v31i12.97 https://hdl.handle.net/20.500.12930/7340 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/97/77 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 31 No. 1B (2005); 179-195 Ciencias Marinas; Vol. 31 Núm. 1B (2005); 179-195 2395-9053 0185-3880
institution Repositorio Institucional
collection DSpace
language eng
topic PCB
congeners
sediments
coastal lagoons
Ría Formosa
PCBs
congéneres
sedimentos
lagunas costera
Ría Formosa
spellingShingle PCB
congeners
sediments
coastal lagoons
Ría Formosa
PCBs
congéneres
sedimentos
lagunas costera
Ría Formosa
Barreira, LA
Bebianno, MJ
Mudge, SM
Ferreira, AM
Albino, CI
Veriato, LM
Relationship between PCBs in suspended and settled sediments from a coastal lagoon
description Polychlorinated biphenyl (PCB) congener concentrations and organic matter content were determined in 84 samples of suspended and settled sediments collected from six different locations in the Ria Formosa lagoon (Portugal). Total PCB (tPCB) concentrations were higher in the suspended matter (1.00–39.80 ng g–1 dw) than in the sediments (0.10–2.10 ng g–1 dw) and, in general, the same was true for the organic matter. Partial least squares (PLS) analysis using the suspended sediments as signatures indicated that they better explained the settled sediment pattern compared to the reverse. This suggests a suspended sediment source outside the lagoon as source of these PCBs. PLS analysis also indicated that Aroclor 1242 best explained the congener pattern in the sediments, but lower fits were obtained for the suspended matter. The tri- and tetra-chlorinated biphenyls were the most abundant congeners (about 60% of tPCB), followed by the hexa- (20%), penta- (11%) and hepta + octa-chlorobiphenyls (9%). The principal congener differences between the suspended and settled sediments were for the smaller tri- and tetrachlorinated biphenyls, which were preferentially accumulated in the settled sediments. In contrast, congener 49 was significantly more abundant in the suspended phase and may be formed through the anaerobic UV degradation pathway either in suspension or on the surface of strongly anoxic sediments at low tide.
format info:eu-repo/semantics/article
author Barreira, LA
Bebianno, MJ
Mudge, SM
Ferreira, AM
Albino, CI
Veriato, LM
author_facet Barreira, LA
Bebianno, MJ
Mudge, SM
Ferreira, AM
Albino, CI
Veriato, LM
author_sort Barreira, LA
title Relationship between PCBs in suspended and settled sediments from a coastal lagoon
title_short Relationship between PCBs in suspended and settled sediments from a coastal lagoon
title_full Relationship between PCBs in suspended and settled sediments from a coastal lagoon
title_fullStr Relationship between PCBs in suspended and settled sediments from a coastal lagoon
title_full_unstemmed Relationship between PCBs in suspended and settled sediments from a coastal lagoon
title_sort relationship between pcbs in suspended and settled sediments from a coastal lagoon
publisher Iniversidad Autónoma de Baja California
publishDate 2005
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/97
_version_ 1792609597584834560