Composição química da precipitação úmida da região metropolitana de Porto Alegre, Brasil, 2005- 2007

Migliavacca, Daniela Montanari; Teixeira, Elba Calesso; Rodriguez, Maria Teresa Raya

doi:10.1590/s0100-40422012000600002

Cited by 20 publications

(19 citation statements)

References 17 publications

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“…O tráfego veicular e as fontes estacionárias são os maiores responsáveis pela emissão de poluentes para a atmosfera Alves et al, 2020). No período do presente estudo, a rodovia federal BR-116 tinha um intenso fluxo veicular na região metropolitana de Porto Alegre, de aproximadamente 150.000 veículos por dia (Migliavacca et al, 2012), sendo responsável por aproximadamente 40% das emissões veiculares no Estado (FEPAM, 2019). Esta rodovia é a principal via de ligação entre a capital e grande parte dos municípios da região metropolitana, além de outras regiões do Estado e dos estados do Sul, do Sudeste e do Nordeste do país.…”

Section: Genotoxicidade Do Ar Atmosféricounclassified

Genotoxicidade do Ar Atmosférico e Epífitos Vasculares em uma Unidade de Conservação de uma Região Metropolitana no Sul do Brasil

Costa

Graeff

Marcon

et al. 2020

Rev. Bras. Geog. Fis.

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A genotoxicidade do ar e a composição e estrutura comunitária de epífitos vasculares foram analisadas em um fragmento de mata ciliar inserido em uma unidade de conservação localizada na região metropolitana de Porto Alegre, no sul do Brasil. Durante cinco eventos distribuídos ao longo de um ano, inflorescências de Tradescantia pallida var. purpurea foram expostas por 8 horas ao ar atmosférico na borda do fragmento e micronúcleos foram quantificados em células meióticas. Foram registradas frequências de 4,07 a 5,27 micronúcleos, caracterizando o ambiente como genotóxico. Foram inventariadas 35 espécies de epífitos vasculares, alocadas em 22 gêneros e seis famílias. Orchidaceae, Bromeliaceae, Polypodiaceae e Cactaceae foram as famílias com maior riqueza (12, nove, seis e cinco espécies, respectivamente). Microgramma vacciniifolia, Rhipsalis teres, Tillandsia aeranthos e Pleopeltis pleopeltifolia, espécies com características adaptativas a ambientes com intervenções antrópicas, concentraram mais de 50% do valor de importância epifítico total da comunidade. A riqueza de espécies foi menor quando comparada às de matas ciliares do trecho superior da bacia hidrográfica em que se encontra a unidade de conservação. A simplificação da estrutura da comunidade epifítica pode estar associada ao aumento da urbanização e da poluição atmosférica evidenciada pela genotoxicidade do ar. Atmospheric Air Genotoxicity and Vascular Epiphytes in a Conservation Unit from a Metropolitan Area in South Brazil ABSTRACTThe genotoxicity of the atmospheric air and the community structure of vascular epiphytes were analyzed in a riparian forest fragment inserted in a conservation unit located in the metropolitan area of Porto Alegre, South Brazil. During five events along a year, inflorescences of Tradescantia pallida var. purpurea were exposed for 8 hours to the atmospheric air at the edge of the fragment and micronuclei were quantified in meiotic cells. Frequencies from 4.07 to 5.27 micronuclei were recorded, characterizing the environment as genotoxic. Thirty-five species of vascular epiphytes were inventoried, allocated in 22 genera and six families. Orchidaceae, Bromeliaceae, Polypodiaceae and Cactaceae were the families with the greatest richness (12, nine, six and five species, respectively). Microgramma vacciniifolia, Rhipsalis teres, Tillandsia aeranthos and Pleopeltis pleopeltifolia, species with adaptive characteristics to environments with anthropic interventions, concentrated more than 50% of the total epiphytic importance value of the community. Species richness was lower when compared to riparian forests at the upper stretch of the hydrographic basin where the conservation unit is located. The simplification of the structure of the epiphytic community may be associated with the increase in urbanization and atmospheric pollution evidenced by the genotoxicity of the air.Keywords: conservation, floristics, forest fragmentation, genotoxic potential, urbanization.

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Section: Genotoxicidade Do Ar Atmosféricounclassified

Genotoxicidade do Ar Atmosférico e Epífitos Vasculares em uma Unidade de Conservação de uma Região Metropolitana no Sul do Brasil

Costa

Graeff

Marcon

et al. 2020

Rev. Bras. Geog. Fis.

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“…The concentrations of NO3 -and NO2 -are derived from agricultural sources, from phosphate fertilizers, in which the NH4 + ion can be converted to NH3 by chemical reactions in the atmosphere and potentiate the process of rainwater neutralization (Migliavacca et al, 2012). The presence of these ions comes from subsistence agriculture and monocultures of rice in the upper and lower stretches of the RSHB, respectively.…”

Section: Rainwatermentioning

confidence: 99%

“…The presence of Pb in rainwater does not come from the Earth's crust and its origin may be related to the enrichment of particles originating from anthropic sources, such as coal combustion, founding and vehicular emissions (Migliavacca, et al, 2012, Wu et al, 2016, Herrera et al, 2009). As to the other metals, Cr> Cu> Cd, a strong (Cr) to extreme (Cu and Cd) enrichment is observed.…”

Section: Rainwatermentioning

confidence: 99%

“…The natural process of wet deposition results from the combination of chemical compounds and particles, which are removed by droplets or cloud droplets incorporated during precipitation (Seinfeld and Pandis, 2006;Souza et al 2006;Herrera et al, 2009;Migliavacca et al, 2012). Therefore, rainwater reflects characteristics of the content of soluble gases and the particles of the atmosphere itself (Xiao et al, 2013;Wu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of a subtropical riparian forest focusing on botanical, meteorological, ecological characterization and chemical analysis of rainwater

et al. 2018

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Riparian forests are heterogeneous environments, in which epiphytes find ideal conditions to develop. These plants absorb the necessary nutrients for survival from the atmosphere, and their occurrence and distribution can be influenced by the quality and quantity of precipitation. The objective of this research was to perform an integrated analysis of botanical, meteorological and chemical precipitation parameters so as to compare them in fragments of the riparian forest in the lower (São Leopoldo-SL) and upper (Caraá-CA) stretches of the Rio dos Sinos Hydrographic Basin (RSHB), RS, Brazil. Rainwater was chemically analyzed, the community structure of epiphytic ferns was surveyed and the ecological characterization was evaluated through the Rapid Habitat Assessment Protocol (RHAP). The results showed that the chemical composition of rainwater is influenced by the environment of each area. In the upper stretch (CA), for instance, the main contribution is that of marine ions, while in the lower stretch (SL), the most impacting aspects are urbanization and industrialization. Similarly, the results depict a reduction of richness and a simplification of the community structure of epiphytic ferns and their environmental quality according to the RHAP categories, towards the base level of the RSHB. The integrated analysis, in which different methods were applied, proved to be an efficient tool to evaluate environmental quality. This analysis considers that a greater number of biotic and abiotic variables may be applied in different scenarios. botânicos, meteorológicos e químicos da precipitação, a fim de compará-los em fragmentos de mata ciliar, nos trechos inferior (São Leopoldo-SL) e superior (Caraá-CA) da Bacia Hidrográfica do Rio dos Sinos (BHRS), RS Brasil. Para tal, foram realizadas análises químicas da água de chuva, analisada a estrutura comunitária das samambaias epifíticas e, avaliada a caracterização ecológica, através do Protocolo de Avaliação Rápida de Hábitats (PARH). Os resultados demonstraram que a composição química da água de chuva é influenciada pelo entorno de cada local estudado, sendo que do terço superior (CA), a maior contribuição é de íons de origem marinha, enquanto que, no trecho inferior (SL), a mesma é oriunda da urbanização e industrialização. Da mesma forma, ficou evidenciada a redução da riqueza e simplificação da estrutura comunitária de samambaias epifíticas e de sua qualidade ambiental de acordo com as categorias do PARH, em direção à foz da BHRS. A análise integrada aplicando diferentes métodos foi uma ferramenta eficiente para avaliar a sua qualidade ambiental, pois permite integrar um maior número de variáveis bióticas e abióticas, podendo ser aplicada em diferentes cenários.Palavras-chave: água de chuva, análise ambiental, caracterização ecológica, samambaias epifíticas.

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“…Chia is an annual herbaceous plant belonging to the family Lamiaceae, native to Mexico (Busilacchi et al, 2013). This plant species has a wide geographic distribution (Hernández-Gómez et al, 2008) being cultivated on a large scale in Paraguay Irala, 2013) and, lately has been gaining world market (Migliavacca et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Use of mufla oven calcination method in oil quantification of chia seeds

Silva¹,

Ducheski²,

Silva³

et al. 2020

Rev. Act. Igu.

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Chia (Salvia hispanicaL.) is an annual herbaceous plant considered as natural omega-3 fatty acids source. To quantify this oil in seeds, a time-consuming method involving financial costs with chemical reagents is used. The objective of this work was verifying existence of correlation between the quantification of oil in chia seeds by means of the Soxhlet method with the ash mass of these seeds obtained by calcination in a muffle oven. For this, samples of chia seeds and the oil quantified by Soxhlet were collected. The same samples were calcined in ash. The simple correlation test was performed, obtaining linear regression. To method validation, a completely randomized design experiment was carried out. The treatments were to quantify the oil by the Soxhlet method and calcination in the muffle using the equation obtained. The objective was to verify the existence of correlation between the oil content of chia seeds, obtained by the Soxhlet method with ash content obtained after burning in the muffle and, therefore, the validation of this method of determination. There is a significant positive correlation between the oil content obtained by Soxhlet method and the ash mass of chia seed. By equation Y = -2.5319x + 16.518, it was noted that it is feasible to quantify the oil content

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Composição química da precipitação úmida da região metropolitana de Porto Alegre, Brasil, 2005- 2007

Cited by 20 publications

References 17 publications

Genotoxicidade do Ar Atmosférico e Epífitos Vasculares em uma Unidade de Conservação de uma Região Metropolitana no Sul do Brasil

Genotoxicidade do Ar Atmosférico e Epífitos Vasculares em uma Unidade de Conservação de uma Região Metropolitana no Sul do Brasil

Assessment of a subtropical riparian forest focusing on botanical, meteorological, ecological characterization and chemical analysis of rainwater

Use of mufla oven calcination method in oil quantification of chia seeds

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