Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias

Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias

 In January 1998, four sediment cores were collected to reconstruct the history of contamination by persistent organic compounds in the southern region of the Bight of the Californias. Two groups of compounds were determined using chromatographic methods: petroleum hydrocarbons (aliphatic h...

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Autores principales: Partida-Gutiérrez, DI, Villaescusa, JA, Macías-Zamora, JV, Castillón, FF
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2003
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/164
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spelling oai:cienciasmarinas.com.mx:article-1642019-04-24T23:23:03Z Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias Contaminantes orgánicos persistentes en núcleos de sedimentos de la región sur de la Cuenca de las Californias Partida-Gutiérrez, DI Villaescusa, JA Macías-Zamora, JV Castillón, FF persistent organic compounds sediment cores Bight of the Californias compuestos orgánicos persistentes núcleos de sedimentos Cuenca de las Californias  In January 1998, four sediment cores were collected to reconstruct the history of contamination by persistent organic compounds in the southern region of the Bight of the Californias. Two groups of compounds were determined using chromatographic methods: petroleum hydrocarbons (aliphatic hydrocarbons, AHs, and polynuclear aromatic hydrocarbons, PAHs) and chlorinated hydrocarbons (pesticides and polychlorinated biphenyls, PCBs). The AHs had low concentrations, from 0.30 to 3.38 µg g–1, and presented a biogenic allocthonous origin. The PAH concentrations ranged from 0.99 to 673 ng g–1. The distribution of the alkyl homologues and the compound indices showed a clear predominance of PAHs of petrogenic origin. The chlorinated hydrocarbons presented a surface maximum, decreasing with depth to non-detectable levels. The PCB concentrations ranged from 0.18 to 7.15 ng g–1 and pesticides from 0.09 to 19.71 ng g–1. The pesticides that occurred most frequently were p,p'-DDT and its metabolites (p,p'-DDE and p,p'-DDD). Other pesticides detected were γ-chlordane and BHC isomers (α and γ). The statigraphy of the cores was carried out with molecular markers (chlorinated hydrocarbons), which were used to calculate a rate of sedimentation of 0.17 to 0.55 cm yr–1. En enero de 1998, se colectaron 4 núcleos de sedimentos para reconstruir la historia de la contaminación por compuestos orgánicos persistentes (COPs) en la región sur de la Cuenca de las Californias. Se determinaron 2 grupos de compuestos por métodos cromatográficos, los hidrocarburos del petróleo (hidrocarburos alifáticos e hidrocarburos aromáticos polinucleares) y los hidrocarburos clorados (pesticidas y bifenilos policlorados). Los hidrocarburos alifáticos (HA's) presentaron bajas concentraciones de 0.30 a 3.38 µg g–1 y mostraron un origen alóctono biogénico. Las concentraciones de hidrocarburos aromáticos polinucleares (HAP's) fluctuaron entre 0.99 y 673 ng g–1. La distribución de los homólogos de alquilo y los indices compuestos mostraron una clara dominancia de HAP's de origen petrogénico. Los hidrocarburos clorados presentaron un máximo superficial y un decremento con la profundidad hasta niveles no detectables. Las concentraciones de bifenilos policlorados (BPC's) estuvieron comprendidas entre 0.18 y 7.15 ng g–1 y para pesticidas entre 0.09 y 19.71 ng g–1. Los pesticidas más frecuentemente encontrados fueron el p,p'-DDT y sus metabolitos (p,p'-DDE y p,p'-DDD). Otros pesticidas detectados fueron el γ-clordano e isómeros del BHC (α y γ). La estratigrafía de los núcleos fue realizada por marcadores moleculares (hidrocarburos clorados), y a partir de éstos se calculó una tasa de sedimentación entre 0.17 y 0.55 cm año–1. Iniversidad Autónoma de Baja California 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/164 10.7773/cm.v29i4.164 Ciencias Marinas; Vol. 29 No. 4 (2003); 521-534 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 521-534 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/164/140
institution Ciencias Marinas
collection OJS
language eng
format Online
author Partida-Gutiérrez, DI
Villaescusa, JA
Macías-Zamora, JV
Castillón, FF
spellingShingle Partida-Gutiérrez, DI
Villaescusa, JA
Macías-Zamora, JV
Castillón, FF
Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias
author_facet Partida-Gutiérrez, DI
Villaescusa, JA
Macías-Zamora, JV
Castillón, FF
author_sort Partida-Gutiérrez, DI
title Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias
title_short Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias
title_full Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias
title_fullStr Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias
title_full_unstemmed Persistent organic pollutants in sediment cores from the southern region of the Bight of the Californias
title_sort persistent organic pollutants in sediment cores from the southern region of the bight of the californias
description  In January 1998, four sediment cores were collected to reconstruct the history of contamination by persistent organic compounds in the southern region of the Bight of the Californias. Two groups of compounds were determined using chromatographic methods: petroleum hydrocarbons (aliphatic hydrocarbons, AHs, and polynuclear aromatic hydrocarbons, PAHs) and chlorinated hydrocarbons (pesticides and polychlorinated biphenyls, PCBs). The AHs had low concentrations, from 0.30 to 3.38 µg g–1, and presented a biogenic allocthonous origin. The PAH concentrations ranged from 0.99 to 673 ng g–1. The distribution of the alkyl homologues and the compound indices showed a clear predominance of PAHs of petrogenic origin. The chlorinated hydrocarbons presented a surface maximum, decreasing with depth to non-detectable levels. The PCB concentrations ranged from 0.18 to 7.15 ng g–1 and pesticides from 0.09 to 19.71 ng g–1. The pesticides that occurred most frequently were p,p'-DDT and its metabolites (p,p'-DDE and p,p'-DDD). Other pesticides detected were γ-chlordane and BHC isomers (α and γ). The statigraphy of the cores was carried out with molecular markers (chlorinated hydrocarbons), which were used to calculate a rate of sedimentation of 0.17 to 0.55 cm yr–1.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/164
_version_ 1715723937854259200

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