Land-based sources of marine pollution: Organochlorine pesticides in stream systems
Background. Organochlorine pesticides (OCPs) have been dispersed ubiquitously in the environment. Bottom sediments act as sinks for these compounds and their concentrations often reflect the degree of anthropogenic pollution. This study was designed to evaluate the occurrence and distribution of OCP...
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2004
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v11_n4_p227_Miglioranza http://hdl.handle.net/20.500.12110/paper_09441344_v11_n4_p227_Miglioranza |
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paper:paper_09441344_v11_n4_p227_Miglioranza2023-06-08T15:53:38Z Land-based sources of marine pollution: Organochlorine pesticides in stream systems Argentina Land-based source Marine pollution Organochlorine pesticides Pesticides Stream systems Surface sediments chlorinated hydrocarbon insecticide organochlorine pesticide pollutant source sediment pollution streamwater agriculture Argentina article chemistry environmental monitoring river sediment water flow water pollutant Agriculture Argentina Environmental Monitoring Geologic Sediments Hydrocarbons, Chlorinated Insecticides Rivers Water Movements Water Pollutants, Chemical Tapera Background. Organochlorine pesticides (OCPs) have been dispersed ubiquitously in the environment. Bottom sediments act as sinks for these compounds and their concentrations often reflect the degree of anthropogenic pollution. This study was designed to evaluate the occurrence and distribution of OCPs in superficial streambed sediments and their relation to land use in two creeks that contribute to the coastal pollution of the southeastern region of Argentina. Methods. Sampling sites were selected by a combination of land use and stream type. Las Brusquitas creek, which passes through vast agricultural areas, and La Tapera creek which originates in a natural wetland and passes through horticultural farming and urban areas. OCPs quantification was carried out by GC-ECD. Results and Discussion. Results showed similar total OCP concentrations in sediments from both creeks in the range of 6-25 ng/g dry wt. However, when OCPs were expressed in ng/g total organic carbon (TOC), La Tapera creek presented 4-fold higher total levels as a consequence of a higher OCP input during the recent past in that watershed. La Tapera outfall showed 4-fold higher levels than that seen in Las Brusquitas, although both values were below the sediment quality criteria demanded to protect wildlife. ΣEndosulfans, ΣDDTs and Σchlordanes were the main OCP group in all samples, with Endosulfan sulfate being the most frequent and abundant compound. The predominance of metabolites with respect to parent compounds suggests a contamination mainly by runoff from aged and weathered agricultural soils. Conclusions. Despite OCPs being banned, they still exist in creek sediments from the studied region, representing continuous contributions of land-based source contaminants to the marine environment. Outlook. Future research on OCP levels in suspended sediments is recommended in order to determine the total OCP concentrations in the selected stream systems. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v11_n4_p227_Miglioranza http://hdl.handle.net/20.500.12110/paper_09441344_v11_n4_p227_Miglioranza |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Land-based source Marine pollution Organochlorine pesticides Pesticides Stream systems Surface sediments chlorinated hydrocarbon insecticide organochlorine pesticide pollutant source sediment pollution streamwater agriculture Argentina article chemistry environmental monitoring river sediment water flow water pollutant Agriculture Argentina Environmental Monitoring Geologic Sediments Hydrocarbons, Chlorinated Insecticides Rivers Water Movements Water Pollutants, Chemical Tapera |
| spellingShingle |
Argentina Land-based source Marine pollution Organochlorine pesticides Pesticides Stream systems Surface sediments chlorinated hydrocarbon insecticide organochlorine pesticide pollutant source sediment pollution streamwater agriculture Argentina article chemistry environmental monitoring river sediment water flow water pollutant Agriculture Argentina Environmental Monitoring Geologic Sediments Hydrocarbons, Chlorinated Insecticides Rivers Water Movements Water Pollutants, Chemical Tapera Land-based sources of marine pollution: Organochlorine pesticides in stream systems |
| topic_facet |
Argentina Land-based source Marine pollution Organochlorine pesticides Pesticides Stream systems Surface sediments chlorinated hydrocarbon insecticide organochlorine pesticide pollutant source sediment pollution streamwater agriculture Argentina article chemistry environmental monitoring river sediment water flow water pollutant Agriculture Argentina Environmental Monitoring Geologic Sediments Hydrocarbons, Chlorinated Insecticides Rivers Water Movements Water Pollutants, Chemical Tapera |
| description |
Background. Organochlorine pesticides (OCPs) have been dispersed ubiquitously in the environment. Bottom sediments act as sinks for these compounds and their concentrations often reflect the degree of anthropogenic pollution. This study was designed to evaluate the occurrence and distribution of OCPs in superficial streambed sediments and their relation to land use in two creeks that contribute to the coastal pollution of the southeastern region of Argentina. Methods. Sampling sites were selected by a combination of land use and stream type. Las Brusquitas creek, which passes through vast agricultural areas, and La Tapera creek which originates in a natural wetland and passes through horticultural farming and urban areas. OCPs quantification was carried out by GC-ECD. Results and Discussion. Results showed similar total OCP concentrations in sediments from both creeks in the range of 6-25 ng/g dry wt. However, when OCPs were expressed in ng/g total organic carbon (TOC), La Tapera creek presented 4-fold higher total levels as a consequence of a higher OCP input during the recent past in that watershed. La Tapera outfall showed 4-fold higher levels than that seen in Las Brusquitas, although both values were below the sediment quality criteria demanded to protect wildlife. ΣEndosulfans, ΣDDTs and Σchlordanes were the main OCP group in all samples, with Endosulfan sulfate being the most frequent and abundant compound. The predominance of metabolites with respect to parent compounds suggests a contamination mainly by runoff from aged and weathered agricultural soils. Conclusions. Despite OCPs being banned, they still exist in creek sediments from the studied region, representing continuous contributions of land-based source contaminants to the marine environment. Outlook. Future research on OCP levels in suspended sediments is recommended in order to determine the total OCP concentrations in the selected stream systems. |
| title |
Land-based sources of marine pollution: Organochlorine pesticides in stream systems |
| title_short |
Land-based sources of marine pollution: Organochlorine pesticides in stream systems |
| title_full |
Land-based sources of marine pollution: Organochlorine pesticides in stream systems |
| title_fullStr |
Land-based sources of marine pollution: Organochlorine pesticides in stream systems |
| title_full_unstemmed |
Land-based sources of marine pollution: Organochlorine pesticides in stream systems |
| title_sort |
land-based sources of marine pollution: organochlorine pesticides in stream systems |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09441344_v11_n4_p227_Miglioranza http://hdl.handle.net/20.500.12110/paper_09441344_v11_n4_p227_Miglioranza |
| _version_ |
1768544647948271616 |