Geological Evolution of the Brazilian Continental Margin

This article reviews the major findings of an intensive geological and geophysical study of the Brazilian margin and adjacent oceanic and continental areas. Most of the data fits well with standard plate models for Atlantic-type margins, with clearly recognizeable pre-rift, rift, proto-oceanic and oceanic stages. However there are significant problems regarding the nature of the crust beneath the margin and the position of the boundary between oceanic and continental crust

Avaliação de poluição do ar por chumbo particulado: uma abordagem geoquímica

High lead concentrations up to 5478 mg kg-1 were detected in dry atmospheric precipitations in Rio Grande city and adjacent area. Lead anomalies cover up to 30% of the study area. Lead concentration measurement in dry atmospheric precipitation and suspended particulate matter provides a possibility to detect concentrations above lead threshold in the air. The most impacted areas are fishermen's villages. The most possible source of lead in the air is uncontrolled sub industrial activity of local populatio

Níveis e origem da acidificação das chuvas na região do Rio Grande, RS

The current article presents the first data on physical-chemical parameters of wet precipitation collected at single collection point in the city of Rio Grande, during the period of 12 months in 1997-1998. The employed technique of rainwater separation into several portions made clear the process of the atmosphere self-purification during a precipitation event. The pH of rainwater depends on the extent of industrial emissions and increases during a precipitation event. The first portion of rainwater shows an obvious neutralizing effect of soil and ocean-derived components, whose intensity depends on the duration of the preceding dry period

Copper bioavailability and fractionation in Copper-contaminated sandy soils in the wet subtropics (southern Brazil)

We studied the distribution, bioavailability and speciation of copper in subtropical sandy soils exposed to long-term applications of copper-based fungicide. In the surface horizon of the contaminated soils, bioavailable copper surpasses the toxic threshold for plants up to several times. Mobile fractions of copper predominate in top layers, contributing to contamination spreading downward to groundwater. Copper accumulates on the underlying iron hydroxide barrier in quantities comparable to total copper concentrations in the surface horizon. Despite the impediment of the geochemical barrier, most applied copper reaches the aquifer, contaminating the groundwater

Níveis e origem da acidificação das chuvas na região do Rio Grande, RS

The current article presents the first data on physical-chemical parameters of wet precipitation collected at single collection point in the city of Rio Grande, during the period of 12 months in 1997-1998. The employed technique of rainwater separation into several portions made clear the process of the atmosphere self-purification during a precipitation event. The pH of rainwater depends on the extent of industrial emissions and increases during a precipitation event. The first portion of rainwater shows an obvious neutralizing effect of soil and ocean-derived components, whose intensity depends on the duration of the preceding dry period

Evaluation of the air pollution by particulate lead: geochemical approach

Submitted by Bruna Vieira ([email protected]) on 2012-04-03T01:58:41Z No. of bitstreams: 1 AVALIAÇÃO DE POLUIÇÃO DO AR.pdf: 515856 bytes, checksum: a7556ab249a1d43320f29ce9c6faa80e (MD5)Approved for entry into archive by Sabrina Andrade([email protected]) on 2012-06-26T21:55:53Z (GMT) No. of bitstreams: 1 AVALIAÇÃO DE POLUIÇÃO DO AR.pdf: 515856 bytes, checksum: a7556ab249a1d43320f29ce9c6faa80e (MD5)Made available in DSpace on 2012-06-26T21:55:53Z (GMT). No. of bitstreams: 1 AVALIAÇÃO DE POLUIÇÃO DO AR.pdf: 515856 bytes, checksum: a7556ab249a1d43320f29ce9c6faa80e (MD5) Previous issue date: 2003High lead concentrations up to 5478 mg kg-1 were detected in dry atmospheric precipitations in Rio Grande city and adjacent area. Lead anomalies cover up to 30% of the study area. Lead concentration measurement in dry atmospheric precipitation and suspended particulate matter provides a possibility to detect concentrations above lead threshold in the air. The most impacted areas are fishermen’s villages. The most possible source of lead in the air is uncontrolled sub industrial activity of local population

Mercury pollution sources in sediments of Patos lagoon estuary, Southern Brazil

Present study has continued the investigation on distribution of mercury in estuarine sediments of Patos Lagoon which began whilst assessing the after-effect of enormous accidental discharge of sulfuric acid into the estuary. An attempt to evaluate the contribution of anthropogenic effluents on mercury pollution in sediments was undertaken. The effluents from Rio Grande City sewages were categorized into four groups based on their sources. Comparison of mercury concentrations from those, indicated that domestic effluent was prevalent. Apparent geographic controls of effluent locations enriched in mercury on zones of polluted estuarine sediments were also revealed. Insufficient control on waste collecting and absence of sewage treatment are considered the principal causes of mercury pollution in estuarine sediments

Avaliação de poluição do ar por chumbo particulado: uma abordagem geoquímica

High lead concentrations up to 5478 mg kg-1 were detected in dry atmospheric precipitations in Rio Grande city and adjacent area. Lead anomalies cover up to 30% of the study area. Lead concentration measurement in dry atmospheric precipitation and suspended particulate matter provides a possibility to detect concentrations above lead threshold in the air. The most impacted areas are fishermen’s villages. The most possible source of lead in the air is uncontrolled sub industrial activity of local population

Sources and levels of rain acidity in the region of the Rio Grande city, RS, Brazil

Submitted by Bruna Vieira ([email protected]) on 2012-04-12T20:43:48Z No. of bitstreams: 1 NÍVEIS E ORIGENS.pdf: 39732 bytes, checksum: db4617d82f6a7e20f27fffb60a1775cf (MD5)Approved for entry into archive by Sabrina Andrade([email protected]) on 2012-07-03T22:05:50Z (GMT) No. of bitstreams: 1 NÍVEIS E ORIGENS.pdf: 39732 bytes, checksum: db4617d82f6a7e20f27fffb60a1775cf (MD5)Made available in DSpace on 2012-07-03T22:05:50Z (GMT). No. of bitstreams: 1 NÍVEIS E ORIGENS.pdf: 39732 bytes, checksum: db4617d82f6a7e20f27fffb60a1775cf (MD5) Previous issue date: 2000The current article presents the first data on physical-chemical parameters of wet precipitation collected at single collection point in the city of Rio Grande, during the period of 12 months in 1997-1998. The employed technique of rainwater separation into several portions made clear the process of the atmosphere self-purification during a precipitation event. The pH of rainwater depends on the extent of industrial emissions and increases during a precipitation event. The first portion of rainwater shows an obvious neutralizing effect of soil and ocean-derived components, whose intensity depends on the duration of the preceding dry period