Fecal contamination in several rivers of the Greater Metropolitan Area and the Osa Peninsula
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| Autores: | , |
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| 格式: | artículo original |
| 狀態: | Versión publicada |
| Fecha de Publicación: | 2012 |
| 實物特徵: | Contamination of rivers in Costa Rica is an issue that requires special attention. The term “river con- tamination” means the incorporation of strange matter such as microorganisms (total and fecal coliforms), chemical products (soaps, fertilizers, pesti- cides), heavy metals (such as chrome, lead, mercury), or organic matter, the last one coming from soil through superficial water runoff as well as domestic wastewaters. All of them deteriorate the water qua- lity and reduce the different water usage of rivers. Water resources are important not only for pre- servation of human life but also for animal and plant preservation. Costa Rica is worldwide known as a country with an outstanding biodiversity. Even though, the Great Metropolitan Area has most of its rivers severely contaminated, according to the water quality classification Holland index. In this research, the fecal coliform content was analy- zed in 10 different rivers located in the provinces of San José, Alajuela, Heredia, Cartago, as well as Península de Osa. For the purpose of correlating fecal coliforms content with population density, tres different sampling areas were added to each river: the high level zone close to the river origin, the middle sampling area, and the lower level area closer to the river mouth. It was found that middle and high population density areas are highly contaminated with fecal coliforms. Some of them surpass the permissible maximum level permitted for recreational primary contact activities, according to national regulations. It was also determined that lower population den- sity zones, such as Tigre and Rincón rivers of the Península de Osa, the Poás River in the Alajuela Province alongside, and the Purires and Birrís rivers in Cartago, in the middle and higher zones, are less contaminated.The María Aguilar,Torres and Segundo rivers, characterized with a high density population, are the most contaminated waters, basically all year round.The rest of the rivers studied showed levels not appropriate for recreational activities during winter time, meanwhile appropriates levels are acceptable for the summer time. |
| País: | Portal de Revistas TEC |
| 機構: | Instituto Tecnológico de Costa Rica |
| Repositorio: | Portal de Revistas TEC |
| 語言: | Español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/617 |
| 在線閱讀: | https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/617 |
| Palabra clave: | Hydric resources river contamination Península de Osa Great Metropolitan Area fecal coliforms water quality classification Holland index. Recurso hídrico contaminación de ríos Gran Área Metropolitana coliformes fecales Índice holandés de clasificación de la calidad del agua |