Zobrazeno 1 - 10
of 22
pro vyhledávání: '"José F. Rojas"'
Publikováno v:
Ciencias Ambientales, Vol 48, Iss 2, Pp 30-38 (2014)
Inorganic ions concentrations were measured on bulk precipitation samples in seven sites in San José, Heredia and Belen cities during the rainy season 2012. SO4-2, NO3-, Cl-, F-, PO4-3, NH4+, K+, Na+, Ca+2, Mg+2 were analyzed by ion chromatography.
Externí odkaz:
https://doaj.org/article/b629532308114b95b2498285fb6fb8ee
Autor:
Jorge Herrera, José F. Rojas, María Martínez, Geoffroy Avard, Martín De Moore, Wendy Sáenz, Víctor H. Beita, Agustín Rodríguez, Alejandro Agüero
Publikováno v:
Ciencias Ambientales, Vol 48, Iss 2, Pp 54-64 (2014)
PM10 and PM2,5 were sampled simultaneously in urban and volcanic environments in the Metropolitan Area of Costa Rica from October to November 2012. Higher mass concentrations (42-29 μgm-3) of PM10 and PM2,5 were found at industrial and commercial ar
Externí odkaz:
https://doaj.org/article/827a27ed05a5456c8f02dc6dee20fe5e
Autor:
Jorge Herrera, Susana Rodríguez, Éricka Herrera, José F. Rojas, Víctor H. Beita, David Solórzano
Publikováno v:
Ciencias Ambientales, Vol 48, Iss 2, Pp 20-29 (2014)
The performance of passive devices were evaluated for the determination of nitrogen dioxide in 25 sites of San Jose and Belen, for which first, the method parameters such as limit of detection and quantification were determined and the bias and preci
Externí odkaz:
https://doaj.org/article/914aa5ac99fc4465a00c821cf4cb7203
Autor:
Jorge Herrera, José F. Rojas, Víctor H. Beita, Agustín Rodríguez, David Solórzano, Hazel Argüello
Publikováno v:
Ciencias Ambientales, Vol 48, Iss 2, Pp 39-53 (2014)
During 2012 the PM10 concentrations were measured in 13 sampling sites distributed in the metropolitan area of Costa Rica. The samples were collected using high volume samplers and subsequently analyzed for: ions (F-, Cl-, NO2-, NO3-, PO43-, SO42-),
Externí odkaz:
https://doaj.org/article/d56c7a6538c3475f96200919b4fc8b46
Publikováno v:
Ciencias Ambientales, Vol 46, Iss 2, Pp 15-26 (2013)
A characterization of the ammonia and hydrogen sulfide emissions generated by different production models in poultry farms of Costa Rica was carried out. It was found that egg production farms have the largest emissions since they mostly use manageme
Externí odkaz:
https://doaj.org/article/46680986c4c44b099381d5cbb25543bd
Publikováno v:
Ciencias Ambientales, Vol 46, Iss 2, Pp 27-36 (2013)
The emission fluxes of methane (CH4) across air–water interface were measured in three hydroelectric dams in Costa Rica (Brasil, Nuestro Amo and Cote Lake) during three years cycle (2009-2011), using the floating static chamber technique. Samples w
Externí odkaz:
https://doaj.org/article/6f61b42c25194faaa8ad453aa1e04602
Publikováno v:
Ciencias Ambientales, Vol 45, Iss 1, Pp 51-62 (2013)
In this work, we considered data of 25 water quality variables collected between January 2006 to December 2010 at 64 monitoring sites along the Virilla River Subbasin in Costa Rica. Factor analysis identified two potential pollution sources that expl
Externí odkaz:
https://doaj.org/article/c003798e74cc4ed2b491473b626ccf23
Publikováno v:
Ciencias Ambientales, Vol 46, Iss 1 (2013)
Se realizó la caracterización de las emisiones de amoníaco y sulfuro de hidrógeno generadas en las diferentes modalidades de producción dada en granjas avícolas existentes en Costa Rica. Se encontró que las granjas de producción de huevos pos
Externí odkaz:
https://doaj.org/article/0af8a36983fb43aa84186521edd3e188
Publikováno v:
Ciencias Ambientales, Vol 45, Iss 1 (2013)
Se analizaron los datos correspondientes a 25 variables de calidad de agua medidas en muestras recolectadas entre enero de 2006 y diciembre de 2010, en 64 sitios de monitoreo distribuidos a lo largo de la subcuenca del río Virilla, en Costa Rica. Me
Externí odkaz:
https://doaj.org/article/e2e0b5da634d43df98089dae48425b60
Autor:
David Solórzano, Ericka Herrera, José F. Rojas, Susana Rodríguez, Jorge Herrera, Víctor H. Beita
Publikováno v:
Revista de Ciencias Ambientales; Vol. 48 Núm. 1 (2014): Julio-Diciembre; 20-29
Tropical Journal of Environmental Sciences; Vol 48 No 1 (2014): Julio-Diciembre; 20-29
Revista de Ciencias Ambientales; v. 48 n. 1 (2014): Julio-Diciembre; 20-29
Portal de Revistas UNA
Universidad Nacional de Costa Rica
instacron:UNA
Tropical Journal of Environmental Sciences; Vol 48 No 1 (2014): Julio-Diciembre; 20-29
Revista de Ciencias Ambientales; v. 48 n. 1 (2014): Julio-Diciembre; 20-29
Portal de Revistas UNA
Universidad Nacional de Costa Rica
instacron:UNA
Se evaluó el desempeño de los dispositivos pasivos para la determinación de dióxido de nitrógeno en 25 sitios de los cantones de San José y Belén, para lo que, primeramente, se determinó los parámetros de desempeño del método: límite de d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f4ccb49d183663f4b4b15e82e3810d2
https://www.revistas.una.ac.cr/index.php/ambientales/article/view/7227
https://www.revistas.una.ac.cr/index.php/ambientales/article/view/7227
