Papers by Melissa Franzen
Revista Brasileira de Recursos Hídricos, 2006
The hydrographic basin of Sapucaia stream, located in the Metropolitan Region of Porto Alegre has... more The hydrographic basin of Sapucaia stream, located in the Metropolitan Region of Porto Alegre has its sources in the rural area. But, the middle and lower portions of this stream are located in urban areas characterized by a diversity of anthropogenic activities. Concerning the possibility that the stream may present specific contamination problems and in order to verify this, an evaluation of water and streambed sediments was performed from the geochemical-environmental perspective. Nutrients and major and trace elements were analyzed. The dynamic approach based on mass balance models, associated with the determination of natural and anthropogenic fluxes of the elements identified were used to study the geochemical behavior of streamwater. The streambed sediments were analyzed applying the contamination index that led to identifying the sources and distribution of possible contaminants. The results obtained for nutrient concentrates, major and trace elements in the water were compared to water quality standards as determined by current legislation. Concerning nutrients, the water of the Sapucaia are Class 3, indicating domestic effluent contamination. For the major elements, concentrates are higher than the medium Class 2 values and the trace elements are systematically lower than established by the CONAMA 20/86 class limit. The streambed sediments are clearly contaminated and classified as moderately polluted. Therefore, analyzing all points, it can be said that the methodology applied here is appropriate to achieve the desired objectives. The data obtained can be used to provide further information to improve environmental management of the Sapucaia hydrographic basin
Analytical results of phosphorus in the work of mapping low-density geochemical soil and sediment... more Analytical results of phosphorus in the work of mapping low-density geochemical soil and sediment drainage Geochemistry Multipurpose Project in Pernambuco State were used to produce maps and preliminary considerations regarding the potential use of this information. Were analyzed by ICP the B horizon soils and sediments in fractions <80 mesh. Statistical analysis of dispersion of data obtained in different materials provided thresholds above which the levels of phosphorus may be considered anomalous. The multipurpose nature of the project might be exemplified by geochemical maps that combine statistical distribution of the percentiles (25%, 50% and 75%) to reference levels of the source materials, whether for toxicological environmental analysis, or to crustal and lithological exploration, resulting in the delineation of potential prospective areas.
Revista Sociedade & Natureza, Mar 11, 2009
Currently the crisis of the water has been aggravated due to series of factors that from climatic... more Currently the crisis of the water has been aggravated due to series of factors that from climatic questions and geographic to politics. As Tundisi (2000) the quality of the water is grown worse quickly, threatening the suppliment sources. There are many causes for this crisis, but among them the most frequently cited are the increase of the urbanization tax, that increases the necessity of multiple usages of the water, the population increase, that consumes more resources and needs bigger agricultural area for its maintenance, and the ...
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Papers by Melissa Franzen