Title: Study of the distribution of dichlorobenzenes in sediment and water of Suquia River basin (Cordoba-Argentina) by an optimised SPME-GC-MS procedure

Authors: Magdalena V. Monferran, Pablo R. Cortina, Ana N. Santiago, Daniel A. Wunderlin

Addresses: Departamento de Bioquimica Clinica (CIBICI), Facultad Ciencias Quimicas, Universidad Nacional de Cordoba, Haya de la Torre esq. Medina Allende, Ciudad Universitaria 5000, Cordoba, Argentina. ' Departamento de Quimica Organica (INFIQC), Facultad Ciencias Quimicas, Universidad Nacional de Cordoba, Haya de la Torre esq. Medina Allende, Ciudad Universitaria 5000, Cordoba, Argentina. ' Departamento de Quimica Organica (INFIQC), Facultad Ciencias Quimicas, Universidad Nacional de Cordoba, Haya de la Torre esq. Medina Allende, Ciudad Universitaria 5000, Cordoba, Argentina. ' Departamento de Bioquimica Clinica (CIBICI), Facultad Ciencias Quimicas, Universidad Nacional de Cordoba, Haya de la Torre esq. Medina Allende, Ciudad Universitaria 5000, Cordoba, Argentina

Abstract: Three dichlorobenzene isomers (DCBs) were monitored in water and sediment from the Suquia River basin by Solid Phase Microextraction (HS-SPME), coupled to Gas Chromatography–Mass Spectrometry (GC–MS). DCBs were not detected in water or sediments corresponding to the upper basin. Pollution with DCBs became evident when the river flows through small cities. As expected, Cordoba city causes the most severe pollution, presenting up to 764.7 µg kg−1 DW DCBs in the sediment of urban areas. Results show that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin.

Keywords: dichlorobenzenes; Argentina; SPME; river monitoring; water quality; Suquia River; freshwater ecotoxicology; water pollution; domestic activities.

DOI: 10.1504/IJENVH.2009.030108

International Journal of Environment and Health, 2009 Vol.3 No.4, pp.363 - 378

Available online: 10 Dec 2009 *

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