8 documents found, page 1 of 1
Mercury bioaccumulation in fishes of a paddy field in Southern of Brazil
Kütter,Vinicius Tavares; Kütter,Mateus Tavares; Silva-Filho,Emmanoel Vieira; Marques,Eduardo Duarte; Gomes,Olga Venimar de Oliveira; Mirlean,NicolaiAim: The aim of present study was to evaluate the Hg concentration in two species of fish (Astyanax sp and Corydoras paleatus) and its potential use as a biomonitor, in order to know if the use of pesticides and fertilizers in paddy can enhance the Hg contamination to adjacent aquatic environment.MethodsSoil, suspended particulate matter and fish samples were sampled in a paddy field in South Brazil. A cold vap...
Marcadores metálicos como avaliação do impacto crônico de emissões petroquímica...
Garcia,Felipe Azevedo de Paula; Mirlean,Nicolai; Baisch,Paulo RobertoNickel and vanadium were tested as tracers of oil refinery emission distribution in populated area of Rio Grande-RS. The anomalies of these elements in surface soil are considered a long-term reflection of the emissions in low atmosphere. The spatial distribution of Ni and V in the soil corresponded to the pattern of local winds. The threshold of 1.5 backgrounds of these metals markedly outlined the area of pet...
Poluição por mercúrio em aterros urbanos do período colonial no extremo sul do ...
Fragomeni,Luiz Paulo de Moura; Roisenberg,Ari; Mirlean,NicolaiLand reclamation fills in the city of Rio Grande (RS) are polluted by mercury with concentrations ranging from 0.3 to 18.7 mg kg-1. The level of Hg pollution decreases from the oldest landfills of 18th century to recent ones. Mercury distribution along vertical profiles resembles the same for copper, lead, and zinc, what allow supposing that mercury distribution has an autochthonous character. It is suggested t...
Utilização de solos locais para tratamento de efluentes do refino de petróleo c...
Midugno,Rafael; Roisenberg,Ari; Viero,Antonio Pedro; Sanberg,Eduardo; Mirlean,NicolaiThe employment of local soils for extraction of metallic elements was evaluated through batch tests to treat wastewaters generated in a petroleum refinery plant in southern Brazil. Clay and organic carbon content and clay mineralogy provide these soils, in principle, with moderate metal retention capacity. The following retention order was established: Cr3+ > Pb2+ > Cu2+ > Hg2+ > Cd2+, with total amount of meta...
O impacto industrial na composição química das águas subterrâneas com enfoque d...
Mirlean,Nicolai; Machado,Maria Isabel; Osinaldi,Guillermo Martinez; Demoliner,Adriana; Baisch,PauloThe alteration in the quality of groundwater in the industrial zone of Brazil's southernmost state was assessed by a hydrogeochemical study. In 70-85% of the studied area, fluoride, nitrate and phosphate in groundwater surpass the maximum limits for human consumption according to Brazilian environmental legislation. The chemical spectrum of contaminants and their spatial distribution show that fertilizer produc...
Avaliação de poluição do ar por chumbo particulado: uma abordagem geoquímica
Vanz,Argeu; Mirlean,Nicolai; Baisch,PauloHigh 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 mo...
Propagação da poluição atmosférica por flúor nas águas subterrâneas e solos de ...
Mirlean,Nicolai; Casartelli,Maria R.; Garcia,Marina R. D.Fluoride concentration was determined in rainwater, ground water and soil in the zone of fertilizer industry in the city of Rio Grande. In contaminated rainwater fluorine concentration was registered up to the value of 4,4 mg.L-1. Fluorine concentration in the shallow ground water in general reflects its distribution in the atmosphere, but cannot be used as marker of atmosphere contamination in the urban area d...
Níveis e origem da acidificação das chuvas na região do Rio Grande, RS
Mirlean,Nicolai; Vanz,Argeu; Baisch,PauloThe 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 indus...