Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina

Autores
Córdoba, María Alejandra; Del Coco, Valeria Fernanda; Minvielle, Marta Cecilia; Basualdo Farjat, Juan Ángel
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The objective of this study was to evaluate the influencing factors in the occurrence of coliforms in the drinking water in La Plata (Argentina) from June 1999 to June 2001. A total of 180 samples were collected from Rio de La Plata (102 samples) and Puelche Aquifer (78 samples); 45 samples were collected for each of the four seasons. The membrane filter procedure was used for isolating bacteria, and each sample was tested for chlorine and pH. The highest percentage of samples positive for coliforms in the two tested media was obtained in summer while the highest percentage of negative samples was obtained in winter. No Escherichia coli was isolated. The percentage of injured coliforms fluctuated between 70 and 100%. The most frequently isolated bacteria was Enterobacter cloacae in summer, Enterobacter agglomerans in autumn and Klebsiella oxytoca in winter and spring. Significant correlations were observed between coliforms and the distance from the initial treatment point, and with the level of free chlorine. We conclude that drinking water contamination in La Plata occurs in the distribution system due to increased temperatures and reduced disinfectant levels, which result in bacterial regrowth.
Facultad de Ciencias Médicas
Materia
Ciencias Médicas
La Plata (Buenos Aires, Argentina)
Agua Potable
Calidad del Agua
Parasitología
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/5513
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/5513
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, ArgentinaCórdoba, María AlejandraDel Coco, Valeria FernandaMinvielle, Marta CeciliaBasualdo Farjat, Juan ÁngelCiencias MédicasLa Plata (Buenos Aires, Argentina)Agua PotableCalidad del AguaParasitologíaThe objective of this study was to evaluate the influencing factors in the occurrence of coliforms in the drinking water in La Plata (Argentina) from June 1999 to June 2001. A total of 180 samples were collected from Rio de La Plata (102 samples) and Puelche Aquifer (78 samples); 45 samples were collected for each of the four seasons. The membrane filter procedure was used for isolating bacteria, and each sample was tested for chlorine and pH. The highest percentage of samples positive for coliforms in the two tested media was obtained in summer while the highest percentage of negative samples was obtained in winter. No Escherichia coli was isolated. The percentage of injured coliforms fluctuated between 70 and 100%. The most frequently isolated bacteria was Enterobacter cloacae in summer, Enterobacter agglomerans in autumn and Klebsiella oxytoca in winter and spring. Significant correlations were observed between coliforms and the distance from the initial treatment point, and with the level of free chlorine. We conclude that drinking water contamination in La Plata occurs in the distribution system due to increased temperatures and reduced disinfectant levels, which result in bacterial regrowth.Facultad de Ciencias Médicas2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf205-211http://sedici.unlp.edu.ar/handle/10915/5513enginfo:eu-repo/semantics/altIdentifier/issn/1477-8920info:eu-repo/semantics/altIdentifier/doi/10.2166/wh.2009.141info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-11-26T09:28:10Zoai:sedici.unlp.edu.ar:10915/5513Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-11-26 09:28:10.658SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
title Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
spellingShingle Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
Córdoba, María Alejandra
Ciencias Médicas
La Plata (Buenos Aires, Argentina)
Agua Potable
Calidad del Agua
Parasitología
title_short Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
title_full Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
title_fullStr Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
title_full_unstemmed Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
title_sort Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina
dc.creator.none.fl_str_mv Córdoba, María Alejandra
Del Coco, Valeria Fernanda
Minvielle, Marta Cecilia
Basualdo Farjat, Juan Ángel
author Córdoba, María Alejandra
author_facet Córdoba, María Alejandra
Del Coco, Valeria Fernanda
Minvielle, Marta Cecilia
Basualdo Farjat, Juan Ángel
author_role author
author2 Del Coco, Valeria Fernanda
Minvielle, Marta Cecilia
Basualdo Farjat, Juan Ángel
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Médicas
La Plata (Buenos Aires, Argentina)
Agua Potable
Calidad del Agua
Parasitología
topic Ciencias Médicas
La Plata (Buenos Aires, Argentina)
Agua Potable
Calidad del Agua
Parasitología
dc.description.none.fl_txt_mv The objective of this study was to evaluate the influencing factors in the occurrence of coliforms in the drinking water in La Plata (Argentina) from June 1999 to June 2001. A total of 180 samples were collected from Rio de La Plata (102 samples) and Puelche Aquifer (78 samples); 45 samples were collected for each of the four seasons. The membrane filter procedure was used for isolating bacteria, and each sample was tested for chlorine and pH. The highest percentage of samples positive for coliforms in the two tested media was obtained in summer while the highest percentage of negative samples was obtained in winter. No Escherichia coli was isolated. The percentage of injured coliforms fluctuated between 70 and 100%. The most frequently isolated bacteria was Enterobacter cloacae in summer, Enterobacter agglomerans in autumn and Klebsiella oxytoca in winter and spring. Significant correlations were observed between coliforms and the distance from the initial treatment point, and with the level of free chlorine. We conclude that drinking water contamination in La Plata occurs in the distribution system due to increased temperatures and reduced disinfectant levels, which result in bacterial regrowth.
Facultad de Ciencias Médicas
description The objective of this study was to evaluate the influencing factors in the occurrence of coliforms in the drinking water in La Plata (Argentina) from June 1999 to June 2001. A total of 180 samples were collected from Rio de La Plata (102 samples) and Puelche Aquifer (78 samples); 45 samples were collected for each of the four seasons. The membrane filter procedure was used for isolating bacteria, and each sample was tested for chlorine and pH. The highest percentage of samples positive for coliforms in the two tested media was obtained in summer while the highest percentage of negative samples was obtained in winter. No Escherichia coli was isolated. The percentage of injured coliforms fluctuated between 70 and 100%. The most frequently isolated bacteria was Enterobacter cloacae in summer, Enterobacter agglomerans in autumn and Klebsiella oxytoca in winter and spring. Significant correlations were observed between coliforms and the distance from the initial treatment point, and with the level of free chlorine. We conclude that drinking water contamination in La Plata occurs in the distribution system due to increased temperatures and reduced disinfectant levels, which result in bacterial regrowth.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/5513
url http://sedici.unlp.edu.ar/handle/10915/5513
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1477-8920
info:eu-repo/semantics/altIdentifier/doi/10.2166/wh.2009.141
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
205-211
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.011256

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