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Water quality and presence of pesticides in a tropical coastal wetland in southern Mexico

Hernández Romero, Ángel Héctor [autor/a] | Tovilla Hernández, Cristian [autor/a] | Malo, Edi A [autor/a] | Bello Mendoza, Ricardo [autor/a].
Tipo de material: Artículo impreso(a) Artículo impreso(a) Tema(s): Contaminación del agua | Plaguicidas | Plaguicidas organoclorados | Plaguicidas organofosforados | Calidad del aguaDescriptor(es) geográficos: Sistema Lagunar Pozuelos Murillo (Chiapas, México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Marine Pollution Bulletin. volumen 48, número 11-12 (June 2004), páginas 1130-1141. --ISSN: 0025-326XNúmero de sistema: 46369Resumen:
Inglés

The water quality of the Pozuelos-Murillo lagoon system in southern Mexico was evaluated during three periods between March and October 2002, with particular emphasis on the detection of organochlorine and organophosphorous pesticide residues in water and sediments. Physicochemical and microbiological parameters of water were also measured and integrated in a water quality index (WQI). Multivariate analysis was used to regionalise the lagoon system as a function of the behaviour of all measured parameters. Solid phase micro-extraction followed by gas chromatography (SPME-GC) was used for pesticide analysis. The concentration of phosphorous was found to be higher than that of nitrogenous compounds. This, besides a deficiency in dissolved oxygen and a high organic matter concentration (as COD), reflects eutrophication processes in some areas of the system. Measured levels of faecal coliforms and oils and greases were above the limits established by Mexican law and comparable to the concentrations reported for other highly polluted systems in Mexico. Residues of DDD (2.0 μg L-1) in water and DDE (247 ng g-1) and endosulfan I (814 ng g-1) sediments were detected by SPME-GC. The spatial distribution of these contaminants implies major potential risks because the most polluted sites were found to be those with the highest fishing activity. Although in general the WQI is on acceptable levels (65-80%), some contamination problems are evident.
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Artículos Hemeroteca (AR HM) 		ECOSUR 001 Disponible 691217C46369-10
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Disponible para usuarios de ECOSUR con su clave de acceso

The water quality of the Pozuelos-Murillo lagoon system in southern Mexico was evaluated during three periods between March and October 2002, with particular emphasis on the detection of organochlorine and organophosphorous pesticide residues in water and sediments. Physicochemical and microbiological parameters of water were also measured and integrated in a water quality index (WQI). Multivariate analysis was used to regionalise the lagoon system as a function of the behaviour of all measured parameters. Solid phase micro-extraction followed by gas chromatography (SPME-GC) was used for pesticide analysis. The concentration of phosphorous was found to be higher than that of nitrogenous compounds. This, besides a deficiency in dissolved oxygen and a high organic matter concentration (as COD), reflects eutrophication processes in some areas of the system. Measured levels of faecal coliforms and oils and greases were above the limits established by Mexican law and comparable to the concentrations reported for other highly polluted systems in Mexico. Residues of DDD (2.0 μg L-1) in water and DDE (247 ng g-1) and endosulfan I (814 ng g-1) sediments were detected by SPME-GC. The spatial distribution of these contaminants implies major potential risks because the most polluted sites were found to be those with the highest fishing activity. Although in general the WQI is on acceptable levels (65-80%), some contamination problems are evident. eng

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