7 research outputs found
Groundwater arsenic content in Raigón aquifer system (San José, Uruguay)
Get PDFAs a Medical Geology research issue, an environmental arsenic risk assessment study in the most important sedimentary aquifer in southern Uruguay is presented. The Raigón Aquifer System is the most exploited in Uruguay. It has a surface extent of about 1,800 square kilometres and 10,000 inhabitants in San Jose Department, where it was studied. Agriculture and cattle breeding are the main economic activities and this aquifer is the basic support. The groundwater sampling was done on 37 water samples of PRENADER (Natural Resources Management and Irrigation Development Program) wells. Outcropping sediments of Raigón Formation and the overlying Libertad Formation were also sampled in the Kiyú region. The analyses were performed by inductively coupled plasma-optical emission spectrometry (ICP-OES) and inductively coupled plasma-mass spectrometry (ICP-MS). The results showed 80% samples with arsenic levels exceeding the 10 μg/l of WHO as limit for waters, and 11% exceeds the 20 μg/l limit of uruguayan regulation. The median, maximum and minimum water arsenic concentrations determined have been 14.24, 24.19 and 1.44 μg/l, respectively. On the other hand, nine sediment samples of Raigón and Libertad Formations in Kiyú region were analysed and yielded median, maximum and minimum arsenic concentrations of 5.03, 9.82 and 1.18 ppm, respectively. This issue leads to the supposition that the population, as well as industrial and agricultural activities, are consuming water with arsenic concentrations over the national and international maximum recommended limit.Como una aproximación a la Geología Médica en Uruguay se presentan los resultados de un estudio sobre el estado del Sistema Acuífero Raigón en relación a la presencia de arsénico, en el entendido que es el acuífero más explotado en el país. En particular, el área cubierta por este trabajo es de unos 1800 km2 en un territorio con una población de unos 10,000 habitantes en el departamento de San José. La colecta de aguas del acuífero se realizó en perforaciones de la base de datos de PRENADER (Proyecto de Manejo de Recursos Naturales y Desarrollo del Riego) obteniéndose 37 muestras, y sobre 9 muestras de sedimentos tanto de la Formación Raigón como la suprayacente Libertad en afloramientos de la región de Kiyú. Los análisis fueron realizados mediante ICP-MS. Un 80% de las muestras de aguas analizadas mostraron contenidos mayores a los límites de la OMS (10 μg/l) y un 11% de las muestras superaron el límite de la OSE (20 μg/l). El valor medio, máximo y mínimo determinado en el caso del agua subterránea fue de 14.24, 24.19 and 1.44 μg/l, respectivamente. Por otro lado, las nueve muestras de sedimentos analizados mostraron concentraciones media, máxima y mínima de arsénico de 5.03, 9.82 and 1.18 ppm, respectivamente, descartándose en principio un origen geogénico.Cooperation between the University of the Republic (Uruguay) and CSIC from Spain (Ref. 2005UY0001).
DINACYT-Uruguay, Project of the Technological Development Program PDT # 45/14 which included the doctoral thesis work of MSc. Rosario Guerequiz.
CYTED Iberoarsen Network and the International Medical Geology Association contributed with scientific and technical support to improve the knowledge on environmental arsenic and health impacts, with a multidisciplinary approach in Uruguay.
This work was performed under the Research Consolidated Groups SGR-2005-795 PEGEFA (Petrology and Geochemistry Basic and Applied) and SGR-2005-00589 (Mineral Resources), funded by AGAUR-DURSI, Generalitat de Catalunya.Peer reviewe
Estudio preliminar del contenido en arsénico d las aguas subterráneas del suroeste de Uruguay
Get PDFThis work presents new results on the arsenic distribution in the groundwater from the SW of Uruguay.This preliminary study is based in 28 samples from the Aquifer Systems Chuy, Raigón and Mercedes. Thearsenic concentrations observed exceed some thresholds of the Uruguayan and other (e.g., WHO)regulations of water quality. The median, maximum and minimum determined have been 16.9, 58.0 and0.1 µg/l, respectively). There is a horizontal and vertical variation of the concentrations considering alltogether the studied aquifers and also within them. The higher values have been observed in the MercedesAquifer in areas near the Uruguay Rive
Preliminary study on arsenic contents in groundwater from Southwestern Uruguay
Get PDF4 páginas, 1 figura, 3 tablas.This work presents new results on the arsenic distribution in the groundwater from the SW of Uruguay.
This preliminar y study is based in 28 samples from the Aquifer Systems Chuy, Raigón and Mercedes. The
arsenic concentrations observed exceed some thresholds of the Uruguayan and other (e.g., WHO)
regulations of water quality. The median, maximum and minimum determined have been 16.9, 58.0 and
0.1 μg/l, respectively). There is a horizontal and vertical variation of the concentrations considering all
together the studied aquifers and also within them. The higher values have been observed in the Mercedes
Aquifer in areas near the Uruguay River.Este trabajo forma parte del Proyecto
de Cooperación entre la Universidad de la
República de Uruguay y el CSIC de España
(Ref. 2005UY0001). Este trabajo se realiza en el marco
de los Grupos Consolidados de Investigación
SGR-2005-795 PEGEFA
(Petrología y Geoquímica Fundamental y
Aplicada) y SGR-2005-00589 (Recursos
Minerales), financiados por AGAURDURSI,
Generalitat de Catalunya.Peer reviewe
Groundwater arsenic distribution in South-western Uruguay
No full text8 páginas, 2 figuras, 5 tablas.This is the first specific information regarding arsenic distribution of groundwater in SW Uruguay. Twenty-eight wells were sampled on the aquifers of Mercedes, Raigón and Chuy in five localities. The pH, specific conductivity and temperature were determined in the field. The hydrochemical characterization (major and trace elements) was carried out by both inductively coupled plasma-optical emission spectrometry and inductively coupled plasma-mass spectrometry. The occurring arsenic concentrations exceed the recommended threshold for drinking water of the World Health Organization (10 μg/l of As) in 22 samples, with more than 50 μg/l of As in two cases. The median, minimum and maximum concentrations were 0.1, 16.9 and 58.0 μg/l of As, respectively. The studied aquifers present a horizontal and a vertical variation of the concentrations as a whole as well as individually. The highest values were observed in the Mercedes Aquifer in the areas near the Uruguay River.This work was partially funded by a Cooperation
Project between the Republic University of Uruguay and the
CSIC of Spain (Ref. 2005UY0001). This work was carried out in the framework
of the Research Consolidated Groups SGR-2005-795 PEGEFA (Applied
and Basic Petrology and Geochemistry) and SGR-2005-00589
(Mineral Resources), funded by AGAUR-DURSI, Generalitat de
Catalunya.Peer reviewe
Groundwater arsenic distribution in South-western Uruguay
No full text8 páginas, 2 figuras, 5 tablas.This is the first specific information regarding arsenic distribution of groundwater in SW Uruguay. Twenty-eight wells were sampled on the aquifers of Mercedes, Raigón and Chuy in five localities. The pH, specific conductivity and temperature were determined in the field. The hydrochemical characterization (major and trace elements) was carried out by both inductively coupled plasma-optical emission spectrometry and inductively coupled plasma-mass spectrometry. The occurring arsenic concentrations exceed the recommended threshold for drinking water of the World Health Organization (10 μg/l of As) in 22 samples, with more than 50 μg/l of As in two cases. The median, minimum and maximum concentrations were 0.1, 16.9 and 58.0 μg/l of As, respectively. The studied aquifers present a horizontal and a vertical variation of the concentrations as a whole as well as individually. The highest values were observed in the Mercedes Aquifer in the areas near the Uruguay River.This work was partially funded by a Cooperation
Project between the Republic University of Uruguay and the
CSIC of Spain (Ref. 2005UY0001). This work was carried out in the framework
of the Research Consolidated Groups SGR-2005-795 PEGEFA (Applied
and Basic Petrology and Geochemistry) and SGR-2005-00589
(Mineral Resources), funded by AGAUR-DURSI, Generalitat de
Catalunya.Peer reviewe
