Márcio Milani | FURG - Universidade Federal do Rio Grande (original) (raw)
Papers by Márcio Milani
Environmental monitoring and assessment, 2012
The chemical speciation analysis of chromium in one of the most important South American Estuary ... more The chemical speciation analysis of chromium in one of the most important South American Estuary was performed for the first time. Samples were collected in Patos Lagoon Estuary (Brazil) and were analysed by adsorptive cathodic stripping voltammetry, with the following analytical figures of merit: limit of detection, 0.1 nmol L(-1); precision RSD = 3%, n = 7; linearity, from limit of quantitation up to 20 nmol L(-1); and accuracy of 99.8%, expressed as recovery. No labile chromium forms were identified in samples, beside industries and a city were near the study area. It is pointed out a reverse correlation between total and non-active chromium and salinity, which could be explained by biogeochemical processes.
Microchemical Journal, 2003
A nephelometric technique based on a liquid drop is described for the measurement of atmospheric ... more A nephelometric technique based on a liquid drop is described for the measurement of atmospheric sulfur dioxide. A 40-ml drop of barium chloride and hydrogen peroxide solution is suspended in a flowing-air sampling stream. The sulfur (IV) collected is oxidized to sulfur (VI) and finally precipitated as barium sulfate. Nephelometric detection of drop is achieved by an appropriate arrangement consisting of an optical fiber contacting the drop and a photodiode placed at 908 relative to the fiber. The design and characteristics of this drop-based gas sensor system are described. The analytical response, as photocurrent, is proportional to the product of the sampling period and the sulfur dioxide concentration. The detection limit is ca. 1.1 mg m for a 10-min sampling time. The present technique is fairly y3 rapid and simple, uses a small amount of reagent and is set up with low-cost equipment, making this system economically viable. ᮊ
Microchemical Journal, 1999
The measurement of sulfur dioxide in air at the parts-per-billion level is described. The experim... more The measurement of sulfur dioxide in air at the parts-per-billion level is described. The experimental arrangement consists of two optical fibers placed on opposite sides of a liquid droplet of malachite green solution. After light has been passed through the droplet, the transmitted light is ...
Journal of the Brazilian Chemical Society, 2010
Um método analítico baseado na extração em fase sólida e cromatografia líquida acoplada à espectr... more Um método analítico baseado na extração em fase sólida e cromatografia líquida acoplada à espectrometria de massas tandem (LC-ESI-MS-MS) foi desenvolvido e validado para a determinação e confirmação de dezoito agrotóxicos (herbicidas, inseticidas e fungicidas) e dois metabólitos em amostras de água. Os limites de detecção variaram de 0,4 a 40,0 ng L -1 e os limites de quantificação de 4,0 a 100,0 ng L -1 . Foi obtida boa linearidade, com r 2 > 0,99 para todos os compostos. As recuperações, para 95% dos compostos, variaram de 70 a 120%, com RSDs menores que 21% para todos. Através do monitoramento de reações múltiplas (MRM), foram selecionadas duas diferentes transições íon precursor-íon produto para cada agrotóxico. A metodologia proposta pode ser usada para a determinação de resíduos de agrotóxicos em águas de superfície e potável, em concordância com a Lei n° 518 do Ministério da Saúde, Brasil, e com os parâmetros da União Européia para água potável (Directive 98/83/EC).
Journal of Environmental Monitoring, 2000
A simple and sensitive method to determine parts per billion (ppb) of atmospheric formaldehyde in... more A simple and sensitive method to determine parts per billion (ppb) of atmospheric formaldehyde in situ, using chromotropic acid, is described. A colorimetric sensor, coupled to a droplet of 15.5 microL chromotropic acid, was constructed and used to sample and quantify formaldehyde. The sensor was set up with two optical fibers, a light emitting diode (LED) and two photodiodes. The reference and transmitted light were measured by a photodetection arrangement that converts the signals into units of absorbance. Air was sampled around the chromotropic acid droplet. A purple product was formed and measured after the sampling terminated (typically 7 min). The response is proportional to the sampling period, analyte concentration and sample flow rate. The detection limit is approximately 2 ppb and can be improved by using longer sampling times and/or a sampling flow rate higher than that used in this work, 200 mL min-1. The present technique affords a simple, inexpensive near real-time measurement with very little reagent consumption. The method is selective and highly sensitive. This sensor could be used either for outdoor or indoor atmospheres.
International Journal of Environmental Analytical Chemistry, 2010
... a * , Márcio Raimundo Milani a , Adriana Demoliner a , Luis Felipe Hax Niencheski b &... more ... a * , Márcio Raimundo Milani a , Adriana Demoliner a , Luis Felipe Hax Niencheski b & Ana Laura Venquiaruti Escarrone c pages 1048-1062. ... The local water supply system gets surface water for treatment from the São Gonçalo Channel (Figure 1) which extends for 62 km. ...
Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology, 2014
Brazilian Journal of Oceanography, 2008
The southern coastal region of Brazil is highly productive and many of its oceanographic processe... more The southern coastal region of Brazil is highly productive and many of its oceanographic processes are still poorly understood due to a great number of forces, such as the continental input from the Plata River and Patos Lagoon, several distinct oceanic water masses, and a complex contribution from groundwater. The shelf near Albardão is highly rich in dissolved nutrients, particularly in the coastal zone. The narrow sandy barrier that separates the ocean from Mangueira Lagoon has led us to wonder about the possibility of groundwater, and if it might play a role in the productivity of the surrounding area. In order to test this hypothesis, nutrient data from Mirim and Mangueira Lagoons and from Albardão were collected during a rainy period. The present work shows the need to include groundwater transport from Mangueira Lagoon to the coastal zone as one of the main sources for the productivity in that region. However, for such phenomenon to be quantified and better understood, it becomes necessary to use natural isotopes as tracers of the underground input.
Analytical Letters, 2003
... Luiz Fabricio Zara,1 Julio Cesar Rocha,2,* Ma´rcio Raimundo Milani,3 Andre ... The main param... more ... Luiz Fabricio Zara,1 Julio Cesar Rocha,2,* Ma´rcio Raimundo Milani,3 Andre ... The main parameters related to ICP operation, such as radio frequency power (9501750 W ... necessary to separate and preconcentrate them, eliminating interferences from the matrix and concentrating ...
Analytica Chimica Acta, 2001
Nitrogen dioxide is an important atmospheric contaminant, classified as a criteria pollutant in t... more Nitrogen dioxide is an important atmospheric contaminant, classified as a criteria pollutant in the United States. It can be sensitively determined by the simple colorimetric Griess–Saltzmann method. This can constitute the basis of an inexpensive sensitive instrument based on gas-permeable liquid core waveguide tubes that allow long path absorbance measurement. Nitrous (HONO) acid is often present in the atmosphere along
Journal of the Brazilian Chemical Society, 2009
A técnica de gradiente difusivo de membrana (DGT) foi utilizada para determinar metais lábeis in ... more A técnica de gradiente difusivo de membrana (DGT) foi utilizada para determinar metais lábeis in situ durante diferentes condições hidrológicas no estuário da Lagoa dos Patos. As amostras de água foram também analisadas para a fração lábil-Chelex para Cd, Co, Cu, Mn, Ni e Zn usando resina Chelex-100. As concentrações lábeis-DGT de Cd, Cu, Ni e Zn foram mais baixas que a lábil-Chelex, possivelmente devido à ligação do metal coloidal na coluna de resina Chelex. Os resultados do DGT indicaram um decréscimo nas concentrações de todos os elementos, refletindo trocas na especiação dos metais em solução causada pela diminuição da salinidade e associado a mudanças de pH no estuário. Os resultados demonstraram a sensibilidade do DGT para a especiação dos metais e a capacidade do uso da técnica DGT em águas estuarinas altamente dinâmicas para a obtenção de concentrações de metais lábeis integradas ao longo do tempo.
Environmental monitoring and assessment, 2012
The chemical speciation analysis of chromium in one of the most important South American Estuary ... more The chemical speciation analysis of chromium in one of the most important South American Estuary was performed for the first time. Samples were collected in Patos Lagoon Estuary (Brazil) and were analysed by adsorptive cathodic stripping voltammetry, with the following analytical figures of merit: limit of detection, 0.1 nmol L(-1); precision RSD = 3%, n = 7; linearity, from limit of quantitation up to 20 nmol L(-1); and accuracy of 99.8%, expressed as recovery. No labile chromium forms were identified in samples, beside industries and a city were near the study area. It is pointed out a reverse correlation between total and non-active chromium and salinity, which could be explained by biogeochemical processes.
Microchemical Journal, 2003
A nephelometric technique based on a liquid drop is described for the measurement of atmospheric ... more A nephelometric technique based on a liquid drop is described for the measurement of atmospheric sulfur dioxide. A 40-ml drop of barium chloride and hydrogen peroxide solution is suspended in a flowing-air sampling stream. The sulfur (IV) collected is oxidized to sulfur (VI) and finally precipitated as barium sulfate. Nephelometric detection of drop is achieved by an appropriate arrangement consisting of an optical fiber contacting the drop and a photodiode placed at 908 relative to the fiber. The design and characteristics of this drop-based gas sensor system are described. The analytical response, as photocurrent, is proportional to the product of the sampling period and the sulfur dioxide concentration. The detection limit is ca. 1.1 mg m for a 10-min sampling time. The present technique is fairly y3 rapid and simple, uses a small amount of reagent and is set up with low-cost equipment, making this system economically viable. ᮊ
Microchemical Journal, 1999
The measurement of sulfur dioxide in air at the parts-per-billion level is described. The experim... more The measurement of sulfur dioxide in air at the parts-per-billion level is described. The experimental arrangement consists of two optical fibers placed on opposite sides of a liquid droplet of malachite green solution. After light has been passed through the droplet, the transmitted light is ...
Journal of the Brazilian Chemical Society, 2010
Um método analítico baseado na extração em fase sólida e cromatografia líquida acoplada à espectr... more Um método analítico baseado na extração em fase sólida e cromatografia líquida acoplada à espectrometria de massas tandem (LC-ESI-MS-MS) foi desenvolvido e validado para a determinação e confirmação de dezoito agrotóxicos (herbicidas, inseticidas e fungicidas) e dois metabólitos em amostras de água. Os limites de detecção variaram de 0,4 a 40,0 ng L -1 e os limites de quantificação de 4,0 a 100,0 ng L -1 . Foi obtida boa linearidade, com r 2 > 0,99 para todos os compostos. As recuperações, para 95% dos compostos, variaram de 70 a 120%, com RSDs menores que 21% para todos. Através do monitoramento de reações múltiplas (MRM), foram selecionadas duas diferentes transições íon precursor-íon produto para cada agrotóxico. A metodologia proposta pode ser usada para a determinação de resíduos de agrotóxicos em águas de superfície e potável, em concordância com a Lei n° 518 do Ministério da Saúde, Brasil, e com os parâmetros da União Européia para água potável (Directive 98/83/EC).
Journal of Environmental Monitoring, 2000
A simple and sensitive method to determine parts per billion (ppb) of atmospheric formaldehyde in... more A simple and sensitive method to determine parts per billion (ppb) of atmospheric formaldehyde in situ, using chromotropic acid, is described. A colorimetric sensor, coupled to a droplet of 15.5 microL chromotropic acid, was constructed and used to sample and quantify formaldehyde. The sensor was set up with two optical fibers, a light emitting diode (LED) and two photodiodes. The reference and transmitted light were measured by a photodetection arrangement that converts the signals into units of absorbance. Air was sampled around the chromotropic acid droplet. A purple product was formed and measured after the sampling terminated (typically 7 min). The response is proportional to the sampling period, analyte concentration and sample flow rate. The detection limit is approximately 2 ppb and can be improved by using longer sampling times and/or a sampling flow rate higher than that used in this work, 200 mL min-1. The present technique affords a simple, inexpensive near real-time measurement with very little reagent consumption. The method is selective and highly sensitive. This sensor could be used either for outdoor or indoor atmospheres.
International Journal of Environmental Analytical Chemistry, 2010
... a * , Márcio Raimundo Milani a , Adriana Demoliner a , Luis Felipe Hax Niencheski b &... more ... a * , Márcio Raimundo Milani a , Adriana Demoliner a , Luis Felipe Hax Niencheski b & Ana Laura Venquiaruti Escarrone c pages 1048-1062. ... The local water supply system gets surface water for treatment from the São Gonçalo Channel (Figure 1) which extends for 62 km. ...
Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology, 2014
Brazilian Journal of Oceanography, 2008
The southern coastal region of Brazil is highly productive and many of its oceanographic processe... more The southern coastal region of Brazil is highly productive and many of its oceanographic processes are still poorly understood due to a great number of forces, such as the continental input from the Plata River and Patos Lagoon, several distinct oceanic water masses, and a complex contribution from groundwater. The shelf near Albardão is highly rich in dissolved nutrients, particularly in the coastal zone. The narrow sandy barrier that separates the ocean from Mangueira Lagoon has led us to wonder about the possibility of groundwater, and if it might play a role in the productivity of the surrounding area. In order to test this hypothesis, nutrient data from Mirim and Mangueira Lagoons and from Albardão were collected during a rainy period. The present work shows the need to include groundwater transport from Mangueira Lagoon to the coastal zone as one of the main sources for the productivity in that region. However, for such phenomenon to be quantified and better understood, it becomes necessary to use natural isotopes as tracers of the underground input.
Analytical Letters, 2003
... Luiz Fabricio Zara,1 Julio Cesar Rocha,2,* Ma´rcio Raimundo Milani,3 Andre ... The main param... more ... Luiz Fabricio Zara,1 Julio Cesar Rocha,2,* Ma´rcio Raimundo Milani,3 Andre ... The main parameters related to ICP operation, such as radio frequency power (9501750 W ... necessary to separate and preconcentrate them, eliminating interferences from the matrix and concentrating ...
Analytica Chimica Acta, 2001
Nitrogen dioxide is an important atmospheric contaminant, classified as a criteria pollutant in t... more Nitrogen dioxide is an important atmospheric contaminant, classified as a criteria pollutant in the United States. It can be sensitively determined by the simple colorimetric Griess–Saltzmann method. This can constitute the basis of an inexpensive sensitive instrument based on gas-permeable liquid core waveguide tubes that allow long path absorbance measurement. Nitrous (HONO) acid is often present in the atmosphere along
Journal of the Brazilian Chemical Society, 2009
A técnica de gradiente difusivo de membrana (DGT) foi utilizada para determinar metais lábeis in ... more A técnica de gradiente difusivo de membrana (DGT) foi utilizada para determinar metais lábeis in situ durante diferentes condições hidrológicas no estuário da Lagoa dos Patos. As amostras de água foram também analisadas para a fração lábil-Chelex para Cd, Co, Cu, Mn, Ni e Zn usando resina Chelex-100. As concentrações lábeis-DGT de Cd, Cu, Ni e Zn foram mais baixas que a lábil-Chelex, possivelmente devido à ligação do metal coloidal na coluna de resina Chelex. Os resultados do DGT indicaram um decréscimo nas concentrações de todos os elementos, refletindo trocas na especiação dos metais em solução causada pela diminuição da salinidade e associado a mudanças de pH no estuário. Os resultados demonstraram a sensibilidade do DGT para a especiação dos metais e a capacidade do uso da técnica DGT em águas estuarinas altamente dinâmicas para a obtenção de concentrações de metais lábeis integradas ao longo do tempo.