Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Hilda Ledo"'
Publikováno v:
Revista Técnica de la Facultad de Ingeniería, Vol 33, Iss 2, Pp 122-129 (2010)
Se determinó en el sedimento superficial del Lago de Maracaibo los metales: Cu, Cd, Cr, Pb, V y Ni. El estudio abarcó 13 estaciones distribuidas en la Bahía El Tablazo, Estrecho de Maracaibo y Lago de Maracaibo propiamente dicho. Se realizaron un
Externí odkaz:
https://doaj.org/article/0124ef7ceb02463ea93f5ec2d6764e1f
Autor:
Johan Mesa, Alfonso Bravo, José Morales, Ligbel Sánchez, Paola Valle, Elizabeth Gutiérrez, Hilda Ledo
Publikováno v:
Revista Técnica de la Facultad de Ingeniería, Vol 30, Iss Especial, Pp 20-28 (2007)
Los acuíferos subterráneos son una fuente primordial del agua que se utiliza en actividades domésticas y agrícolas en algunas regiones de la cuenca del Lago de Maracaibo, Venezuela. En el presente estudio, se analizó el contenido de cadmio (Cd),
Externí odkaz:
https://doaj.org/article/76a57ea5beef4e3a8538b7bb7640c2af
Publikováno v:
Revista Técnica de la Facultad de Ingeniería, Vol 33, Iss 2 (2012)
 Ni, V, Cr, Cd, Cu and Pb were determined in superficial sediment samples from System Maracaibo Lake. Thirteen sampling points were sampled in Tablazo bay, Maracaibo Strait and Maracaibo Lake, four times during 2 years as follows: October 1999 (rai
Externí odkaz:
https://doaj.org/article/08223737309b4bf2b83cc5a388145ba6
Autor:
Julio Cesar Marín Leal, María Elena Romero González, Marinela Colina de Vargas, Hilda Ledo de Medina
Publikováno v:
Revista Técnica de la Facultad de Ingeniería, Vol 20, Iss 2 (2011)
Pigrnents such as chlorophyll. pheophytins and carotenoids are originated from organic vegetable matter and therefore can provide irúonnation about the load of deposition of organic matter in sediments. Concentrations of these pigrnents. as well a s
Externí odkaz:
https://doaj.org/article/d904d7c8192849a99c7b1e739bbc1947
Ecological risk by potentially toxic elements in surface sediments of the Lake Maracaibo (Venezuela)
Publikováno v:
Environmental Engineering Research. 27:210232
The evaluation of potential ecological risk of aquatic sediments associated with the presence of potentially toxic elements (PTE) determines its degree of danger on native biota. In this work, the potential ecological risk of V, Ti, Cr, Ni, Cu, Zn, A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4944b4ad019f42d6a1d2692ae9b4456
https://doi.org/10.4491/eer.2021.232
https://doi.org/10.4491/eer.2021.232
Publikováno v:
Flow Injection Analysis of Food Additives ISBN: 9780429170300
A food additive is usually dened in the literature as an ingredient added to food as a part of its production (Furia, 1968; Branen et al., 1990). The use of food additives is normally regulated by the corresponding authorities and governmental organi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::57aff3b8f9d7eaee0f1048afde9ba3ae
https://doi.org/10.1201/b19644-24
https://doi.org/10.1201/b19644-24
Publikováno v:
Water, Air, & Soil Pollution. 155:117-135
Ca, Mg, Fe, Mn and Al were determined in surficial sediment samples from Catatumbo River (including sediments from major tributaries) a binational basin shared by both Venezuela and Colombia in approximately 30% and 70%, respectively. The global mean
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f7fe840999f4a17b688c8a9fe5e4408
https://doi.org/10.1023/b:wate.0000026516.47149.d9
https://doi.org/10.1023/b:wate.0000026516.47149.d9
Publikováno v:
Water, Air, and Soil Pollution. 145:341-357
Nitrogen is one of the two most important elements in the metabolism of aquatic eco- systems. At low concentrations it can limit primary productivity and when present at very high concentrations it can participate in the eutrophication process of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::552dec1f28ec83a9b7cffcae14a0cb90
https://doi.org/10.1023/a:1023632702886
https://doi.org/10.1023/a:1023632702886
Publikováno v:
Hydrobiologia. 450:47-55
The distribution of phosphate species in the Catatumbo River, Venezuela, was studied using a sequential extraction scheme. Extraction was performed using 1.0 M NH4Cl, 0.1 M Na2S2O4–NaHCO3, 1.0 M NaOH and 0.5 M HCl. Total phosphate was in the range
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::58e0efd3d127aaefef3ef76e104b9aa5
https://doi.org/10.1023/a:1017535216608
https://doi.org/10.1023/a:1017535216608
Publikováno v:
Water, Air, and Soil Pollution. 117:27-37
Nitrogen (N) and phosphorus (P) concentrations were determined in sediment samples along the bed of Catatumbo river in both Colombian and Venezuelan territories until the river outlet in Maracaibo lake. Total phosphorus was determined by digestion wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4930e5bc96ff5f9047a63b30d135579f
https://doi.org/10.1023/a:1005189710803
https://doi.org/10.1023/a:1005189710803