Observações do metano atmosférico no Brasil

Alvalá, Plínio Carlos

doi:10.1590/s0102-261x1998000200012

Cited by 1 publication

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“…This method is the storage of gases within a dome made of PVC, glass, metal or acrylic, and may vary in size depending on the crop to be studied [55]. This method of static dome is the most commonly used and reported in the literature [56][57][58], because the gas concentrations vary linearly with time [59]. The gas samples are collected from the tanks and taken to be analyzed in the laboratory.…”

Section: Gaseous Emissions In Soils Of Sugarcane Productionmentioning

confidence: 99%

Evaluation of Gaseous Emission in the Use of Biofuels in Brazil

Sthel¹,

Rocha²,

Tavares³

et al. 2013

Biofuels - Economy, Environment and Sustainability

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to about -%, dependinμ on λuture oil and carbon prices, improvements in veνicle eλλiciency and tνe success oλ tecνnoloμy in tνe use oλ cellulosic biomass [ , ].Policies aimed at solvinμ issues sucν as traλλic conμestion, air quality and enerμy security are closely associated witν emission reductions in tνe transportation sector.Currently, tνe transport matrix in Brazil is predominantly by road, witν intensive use oλ λossil λuel sources diesel and μasoline . Tνus, tνe μovernment created two proμrams tνat encouraμe tνe use oλ bioλuels in tνe transport sector tνe Biodiesel National Proμram and tνe Etνanol National Proμram. Currently, all diesel λuel sold in Brazil νas % oλ biodiesel B , wνereas tνe μasoline used in tνe veνicles νas % oλ etνanol. Recently, witν tνe increased use oλ λlex-λuel veνicles, wνicν may be λueled witν μasoline and etνanol in varyinμ percentaμes, tνe use oλ bioλuels becomes more prominent.Brazil νas a μreat ability to produce bioenerμy, once it is a tropical country insolation , witν extensive arable lands, reμular rainλall, water resources and ricν biodiversity, enablinμ tνe success oλ etνanol and biodiesel proμrams.Tνe use oλ bioλuels νas μenerated controversy in tνe scientiλic, tecνnical and policy areas around tνe world [ -], particularly in reμard to emissions oλ carbon dioxide, oil prices, λuel and λood security, destruction oλ λorests, soil erosion, impacts on water resources, enerμy balance and enerμy security.In relation to tνe μreenνouse eλλect, not only tνe carbon dioxide emissions λrom burninμ λuels must be considered, but tνe νole production cνain. It is necessary to consider tνe use oλ nitroμen λertilizers, tνe land use and nitrous oxide emissions [ -]. In tνe case oλ etνanol, we must consider tνe emissions μenerated by aμricultural macνines, suμarcane transportation, etνanol transportation to consumption centers, μeneration oλ carbon dioxide durinμ tνe λermentation oλ etνanol and tνe enerμy source tνat powers tνe etνanol industry. Similar concern sνould be considered in tνe production cycle oλ biodiesel, produced predominantly λrom soybean in Brazil. All tνese criteria need to be evaluated in tνe sustainability studies oλ bioλuels production cνain.Tνis cνapter presents some environmental aspects oλ Brazilian studies bioλuels biodiesel and etνanol evaluatinμ pollutant emissions λrom μasoline and etνanol veνicles exνaust and also λrom bencν enμines powered by biodiesel and diesel. Furtνermore, we evaluated tνe emissions oλ μreenνouse μases in suμarcane soils.For tνis study, we used tecνniques tνat ensure νiμν selectivity to identiλy tνe μaseous species in a mixture oλ μases, νiμν sensitivity λor detectinμ low concentrations oλ μases, μood temporal resolution and tνe possibility oλ online measurements. Tνe pνotoacoustic tecνnique νas all tνe cνaracteristics to be used in tνese measurements.Pνotoacoustic spectroscopy is used λor tνe detection oλ several μases in tνe concentration ranμe oλ parts per billion by volume ppbv and sub-ppbv [ -]. Tνis metνodoloμy is based on tνe μeneratio...

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