Browsing by Author "Valdés-González, Juan"
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Analysis of Benzene Exposure Levels on Commuters Traveling within the Metropolitan Area of Costa Rica
Villalobos-Gonzalez, Wendy; Esquivel-Hernández, Germain; Sanchez-Murillo, Ricardo; Corrales-Salazar, José Leonardo; Valdés-González, Juan (Scientific Research Publishing (China), 2015)This study reports the benzene exposure levels of commuters traveling within the metropolitan area of Costa Rica using personal cars, buses, and urban trains. 47 in-vehicle samples were collected in the 2014 wet season ... -
Application of a Sulfur Removal Hydrometallurgical Process in a Lead-Acid Battery Recycling Plant in Costa Rica
Navarro-Monge, Marta; Esquivel-Hernández, Germain; Sibaja, José; mora barrantes, jose carlos; Sanchez-Murillo, Ricardo; Valdés-González, Juan; Bolaños-Ulloa, Pablo (Scientific Research Publishing Inc., 2017)This study presents the implementation of a desulphurization process for lead recycling under different chemical and physical conditions using pyro-metallurgical processes. Desulphurization was done using a hydrometallurgical ... -
Evaluación de la concentración de los aldehídos en el aire en la Reserva Biológica Monteverde y en la ciudad de Heredia, Costa Rica
Salazar-López, Brenda; Sibaja, José; Valdés-González, Juan; Rodríguez-Rodríguez, Gerardo (Universidad Nacional (Costa Rica), 2016)Se determinó la concentración de seis aldehídos en muestras de aire, durante abril-junio de 2015, en la Reserva Bioló gica Monteverde (RBM) y en Heredia, Costa Rica. El formaldehído, el acetaldehído, el propanal, el butanal, ... -
Evaluación de la variación en la concentración de aldehídos en agua de lluvia y aire: caso de estudio en un área de conservación de Costa Rica
Araya-Araya, Melissa; Sibaja, José; Soto-Fallas, Roy; mora barrantes, jose carlos; Alfaro Solís, Rosa; Borbón-Alpízar, Henry; Valdés-González, Juan (Tecnológico de Costa Rica, 2023-04)Los aldehídos en el ambiente se encuentran entre la mayoría de los compuestos orgánicos que participan en las reacciones fotoquímicas en la atmósfera, formando principalmente radicales en cantidades significativas. Además, ... -
First Measurements of Biogenic Hydrocarbons in Air in a Tropical Cloudy Forest, Monteverde, Costa Rica
Esquivel-Hernández, Germain; Madrigal-Carballo, Sergio; Alfaro Solís, Rosa; Sibaja, José; Valdés-González, Juan (David Publishing Compan, 2011)Measurements of biogenic hydrocarbons in ambient air were carried out during 2008 in a cloud y tropical forest in Monteverde, Costa Rica. Isoprene, α-pinene, β-pinene, 3-carene, d-limonene and γ-terpinene were sampled by ... -
Near Surface Carbon Dioxide and Methane in Urban Areas of Costa Rica
Esquivel-Hernández, Germain; Villalobos-Forbes, Mario; Sanchez-Murillo, Ricardo; Birkel, Christian; Valdés-González, Juan; Boll, Jan (Scientific Research Publishing (China), 2015)Little information is available for Central America regarding methane and carbon dioxide mixing ratios in urban areas. This work reports a representative spatial and seasonal study of near surface carbon dioxide and ...