Bacterial contamination of automotive fuels in a tropical region: the case of Costa Rica.
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| Title: | Bacterial contamination of automotive fuels in a tropical region: the case of Costa Rica. |
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| Authors: | Rodríguez-Rodríguez, Carlos E.1,2 carlos.rodriguezrodriguez@ucr.ac.cr, Rodríguez-Cavallini, Evelyn1 CarlosEsteban.Rodriguez@uab.cat, Blanco, Rigoberto3 rblanco@cariari.ucr.ac.cr |
| Source: | Revista de Biología Tropical. sep2009, Vol. 57 Issue 3, p489-504. 16p. 5 Charts. |
| Subjects: | MOTOR fuels, ANTI-infective agents, RECLAMATION of land, BIODEGRADATION |
| Geographic Terms: | COSTA Rica |
| Abstract (English): | Microbial contamination of fuel has been the cause of several problems in transportation and storage of these products. Due to the lack of previous studies related to these problems in Costa Rica, bacterial quality was evaluated biannually in automotive fuels stored in the four oil distribution facilities of the Costa Rican Petroleum Refinery (RECOPE). In 12 oil storage tanks, for a total of 96 samples, mesophilic, heterotrophic aerobic/facultative counts (ASTM D6974-04) and identification of bacteria presented in regular gas, premium gas and diesel from the bottom and superior part of the tanks were done; in the samples containing an aqueous phase, sulfate reducing bacteria (SRB) were also quantified by the most probable number technique (MPN), according to the ASTM D4412-84 standard. The higher contamination was shown at the bottom of the tanks (populations up to 104 UFC/l), especially if there was accumulated water, in which case populations reached 108 UFC/l. The most contaminated fuel was diesel (counts up to 104 UFC/l), whereas the less contaminated was premium gas. The less contaminated fuels were from the facilities of La Garita and Barranca, whereas the most contaminated were from Ochomogo. Nevertheless, the quantified populations did not cause significant alteration in quality physicochemical parameters in the samples analyzed. A total of 149 bacterial strains were isolated, 136 (91.3%) Gram positive and 13 (8.7%) Gram negative. The most frequent genera were Staphylococcus (24.0%), Micrococcus (21.9%), Bacillus (18.8%) and Kocuria (11.5%) among Gram positive bacteria and Pseudomonas (7.3%) among Gram negative bacteria. The majority of these genera have been found as fuel contaminants or even as degraders of this kind of products; nevertheless, some species for which their appearance or growth in hydrocarbons have not been described were found with low frequencies. SRB were present in counts up to 105 MPN/l in 42.9% of water containing samples (including all from diesel tanks), indicating biocorrosion processes risk in fuel transport and storage systems. From the findings in this study it is recommended to give a frequent maintenance to fuel containers, based on continuous drainage and removal of accumulated water, antimicrobial agent addition and microbial quality monitoring in country's fuels. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): | Se evaluó semestralmente durante dos años la calidad bacteriana de los combustibles almacenados en los cuatro planteles de la Refinadora Costarricense de Petróleo (Costa Rica). Para un total de 96 muestras se realizaron recuentos (norma ASTM D6974-04) e identificación de las bacterias presentes en gasolina regular, gasolina súper y diesel en los niveles superior e inferior de los tanques contenedores; en las muestras con fase acuosa se cuantificaron las bacterias reductoras de sulfato (SRB, norma ASTM D4412-84). La mayor contaminación se observó en el fondo de los tanques, sobretodo si se presentó una capa de agua almacenada. El diesel fue el combustible más contaminado, sin embargo, no se observó alteración importante en los parámetros fisicoquímicos de las muestras evaluadas. Se aislaron 149 cepas, 136 (91.3%) Gram positivas y 13 (8.7%) Gram negativas; los géneros más frecuentes fueron Staphylococcus (24.0%), Micrococcus (21.9%), Bacillus (18.8%), Kocuria (11.5%) y Pseudomonas (7.3%). Con bajas frecuencias se encontraron algunas especies para las que no se ha descrito su aparición o crecimiento en hidrocarburos. Las SRB se presentaron con recuentos de hasta 105 MPN/l en un 42.9% de las muestras con agua residual, principalmente en diesel, lo cual es indicativo de alerta por biocorrosión. A partir de los resultados se recomienda dar un mantenimiento frecuente a los contenedores, la adición de compuestos antimicrobianos y el monitoreo de la calidad microbiana de los combustibles del país. [ABSTRACT FROM AUTHOR] |
| Copyright of Revista de Biología Tropical is the property of Universidad de Costa Rica and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: Bacterial contamination of automotive fuels in a tropical region: the case of Costa Rica. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rodríguez-Rodríguez%2C+Carlos+E%2E%22">Rodríguez-Rodríguez, Carlos E.</searchLink><relatesTo>1,2</relatesTo><i> carlos.rodriguezrodriguez@ucr.ac.cr</i><br /><searchLink fieldCode="AR" term="%22Rodríguez-Cavallini%2C+Evelyn%22">Rodríguez-Cavallini, Evelyn</searchLink><relatesTo>1</relatesTo><i> CarlosEsteban.Rodriguez@uab.cat</i><br /><searchLink fieldCode="AR" term="%22Blanco%2C+Rigoberto%22">Blanco, Rigoberto</searchLink><relatesTo>3</relatesTo><i> rblanco@cariari.ucr.ac.cr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Revista+de+Biología+Tropical%22">Revista de Biología Tropical</searchLink>. sep2009, Vol. 57 Issue 3, p489-504. 16p. 5 Charts. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22MOTOR+fuels%22">MOTOR fuels</searchLink><br /><searchLink fieldCode="DE" term="%22ANTI-infective+agents%22">ANTI-infective agents</searchLink><br /><searchLink fieldCode="DE" term="%22RECLAMATION+of+land%22">RECLAMATION of land</searchLink><br /><searchLink fieldCode="DE" term="%22BIODEGRADATION%22">BIODEGRADATION</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22COSTA+Rica%22">COSTA Rica</searchLink> – Name: Abstract Label: Abstract (English) Group: Ab Data: Microbial contamination of fuel has been the cause of several problems in transportation and storage of these products. Due to the lack of previous studies related to these problems in Costa Rica, bacterial quality was evaluated biannually in automotive fuels stored in the four oil distribution facilities of the Costa Rican Petroleum Refinery (RECOPE). In 12 oil storage tanks, for a total of 96 samples, mesophilic, heterotrophic aerobic/facultative counts (ASTM D6974-04) and identification of bacteria presented in regular gas, premium gas and diesel from the bottom and superior part of the tanks were done; in the samples containing an aqueous phase, sulfate reducing bacteria (SRB) were also quantified by the most probable number technique (MPN), according to the ASTM D4412-84 standard. The higher contamination was shown at the bottom of the tanks (populations up to 104 UFC/l), especially if there was accumulated water, in which case populations reached 108 UFC/l. The most contaminated fuel was diesel (counts up to 104 UFC/l), whereas the less contaminated was premium gas. The less contaminated fuels were from the facilities of La Garita and Barranca, whereas the most contaminated were from Ochomogo. Nevertheless, the quantified populations did not cause significant alteration in quality physicochemical parameters in the samples analyzed. A total of 149 bacterial strains were isolated, 136 (91.3%) Gram positive and 13 (8.7%) Gram negative. The most frequent genera were Staphylococcus (24.0%), Micrococcus (21.9%), Bacillus (18.8%) and Kocuria (11.5%) among Gram positive bacteria and Pseudomonas (7.3%) among Gram negative bacteria. The majority of these genera have been found as fuel contaminants or even as degraders of this kind of products; nevertheless, some species for which their appearance or growth in hydrocarbons have not been described were found with low frequencies. SRB were present in counts up to 105 MPN/l in 42.9% of water containing samples (including all from diesel tanks), indicating biocorrosion processes risk in fuel transport and storage systems. From the findings in this study it is recommended to give a frequent maintenance to fuel containers, based on continuous drainage and removal of accumulated water, antimicrobial agent addition and microbial quality monitoring in country's fuels. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Abstract (Spanish) Group: Ab Data: Se evaluó semestralmente durante dos años la calidad bacteriana de los combustibles almacenados en los cuatro planteles de la Refinadora Costarricense de Petróleo (Costa Rica). Para un total de 96 muestras se realizaron recuentos (norma ASTM D6974-04) e identificación de las bacterias presentes en gasolina regular, gasolina súper y diesel en los niveles superior e inferior de los tanques contenedores; en las muestras con fase acuosa se cuantificaron las bacterias reductoras de sulfato (SRB, norma ASTM D4412-84). La mayor contaminación se observó en el fondo de los tanques, sobretodo si se presentó una capa de agua almacenada. El diesel fue el combustible más contaminado, sin embargo, no se observó alteración importante en los parámetros fisicoquímicos de las muestras evaluadas. Se aislaron 149 cepas, 136 (91.3%) Gram positivas y 13 (8.7%) Gram negativas; los géneros más frecuentes fueron Staphylococcus (24.0%), Micrococcus (21.9%), Bacillus (18.8%), Kocuria (11.5%) y Pseudomonas (7.3%). Con bajas frecuencias se encontraron algunas especies para las que no se ha descrito su aparición o crecimiento en hidrocarburos. Las SRB se presentaron con recuentos de hasta 105 MPN/l en un 42.9% de las muestras con agua residual, principalmente en diesel, lo cual es indicativo de alerta por biocorrosión. A partir de los resultados se recomienda dar un mantenimiento frecuente a los contenedores, la adición de compuestos antimicrobianos y el monitoreo de la calidad microbiana de los combustibles del país. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Revista de Biología Tropical is the property of Universidad de Costa Rica and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 489 Subjects: – SubjectFull: MOTOR fuels Type: general – SubjectFull: ANTI-infective agents Type: general – SubjectFull: RECLAMATION of land Type: general – SubjectFull: BIODEGRADATION Type: general – SubjectFull: COSTA Rica Type: general Titles: – TitleFull: Bacterial contamination of automotive fuels in a tropical region: the case of Costa Rica. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rodríguez-Rodríguez, Carlos E. – PersonEntity: Name: NameFull: Rodríguez-Cavallini, Evelyn – PersonEntity: Name: NameFull: Blanco, Rigoberto IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: sep2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 00347744 Numbering: – Type: volume Value: 57 – Type: issue Value: 3 Titles: – TitleFull: Revista de Biología Tropical Type: main |
| ResultId | 1 |
