Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Marinela Colina de Vargas"'
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
Autor:
Graciela González, Elizabeth Gutiérrez, Julio Marín, Marinela Colina de Vargas, Eduardo Andueza, Hilda Ledo de Medina
Publikováno v:
Journal of Chromatography A. 739:207-215
Phosphorus in aquatic systems is generally considered the limiting nutrient in most of cases. Its concentration may be below 0.01 mg/l. The sensitivity of the standard method for phosphate with ascorbic acid does not allow its determination in these
Publikováno v:
Journal of Chromatography A. 671:287-293
The standard method for the determination of organic nitrogen in water samples in the past has been based on the Kjeldahl digestion technique that converts organic nitrogen into ammonia, which can then be determined along with any ammonia originally
Publikováno v:
The Analyst. 117(3)
Two sampling sessions were carried out in Lake Maracaibo and eight sites selected in four pairs one in front of the other (El Mojan-Ancon de iturre, Santa Cruz de Mara-Punta de Palmas, Maracaibo-Punta de Leiva and San Francisco-La Rita). Specimens of
Autor:
Elizabeth Gutiérrez, Enrique Villalobos, Marinela Colina de Vargas, Hilda Ledo de Medina, Roman Mazurek
Publikováno v:
The Analyst. 120:761
The standard method for the determination of organic nitrogen in water samples has in the past been based on Kjeldahl's digestion technique which determines nitrogen in the triply negative state. In the presence of sulfuric acid, potassium sulfate, m
Publikováno v:
The Analyst. 119:623
Sediment points in Sinamaica Lagoon (Venezuela) was divided into seven sectors, taking into account different water mixtures, waste-water discharges, macrophytes growth zones, etc., and each was sampled ten times during 2 years. A coal mine on the Gu