Métodos para análises de HPA e BTEX em águas subterrâneas de postos de revenda de combustíveis: um estudo de caso em Campo Grande, MS, Brasil

Gebara, Sâmya Soler; Ré-Poppi, Nilva; Nascimento, André Ferreira do; Raposo, Jorge Luiz

doi:10.1590/s0100-40422013000700018

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…First the samples were submitted to headspace extraction, at an incubation and syringe temperature of 85 °C, incubation time of 5 min and stirring speed of 250 rpm. After extraction, the samples were injected in a gas chromatograph (Shimadzu QP2010 ultra) with a flame ionization detector (FID) coupled to an RTX‐5MS column (30 m × 0.25 mm), and were submitted to a temperature program of 40 °C for 2 min followed by increase to 120 °C at a rate of 10 °C min −1 . A sample volume of 1.0 µL was injected in split mode (1:10), using helium as carrier gas at a flow of 1 mL min −1 and injector and detector temperatures of 230 and 250 °C, respectively…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Toluene Adsorption by Porous Resins: Batch and Continuous Flow Studies

Silva

Rocha

Lucas

2018

Macromolecular Symposia

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Water contaminated with monoaromatic hydrocarbons must be treated before being discharged due to the high toxicity of these compounds. Various treatment methods are currently used, among them processes that involve adsorption. Polymeric resins has been used to treat water and then it is a promising method to be applied for removing various compounds from oily water. In this work, two polymeric resins (divinylbenzene − DVB and methylmethacrylate‐divinylbenzene − MMA‐DVB), previously synthesized, were evaluated for removal of toluene from water. Batch tests were performed to study the adsorption equilibrium using the Langmuir and Freundlich models, while the adsorption kinetics were analyzed by the pseudo first‐order and pseudo second‐order models. Besides this, the saturation and regeneration were analyzed with continuous flow tests. The empirical model of Freundlich described the adsorption equilibrium data better than the theoretical model of Langmuir. Likewise, the pseudo first‐order model best represented the experimental data regarding the adsorption kinetics of the systems studied. In the batch tests, the resin DVB was most efficient in removing toluene, but it reached equilibrium with a longer contact time. The continuous flow tests showed that the two systems presented good removal performance; however, DVB column could treat ≈600 bed volumes of water while MMA‐DVB treated only ≈280. The absorbents revealed great potential to be regenerated.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Toluene Adsorption by Porous Resins: Batch and Continuous Flow Studies

Silva

Rocha

Lucas

2018

Macromolecular Symposia

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“…The results presented in Table 6 show that PAH with the highest and lowest content in groundwater samples were naphthalene (Naf ) and acenaphthylene (Aci), with 36.4 This scenario may be related to the combustion processes of biomass and fossil fuels, as well as occurrences of fuel leaks (gasoline, diesel, lubricating oil) at fuel retailers located in the region under study [4,5,29,41,42].…”

Section: Total Concentration Of Pah In Groundwater Samplesmentioning

confidence: 99%

“…These compounds are fundamentally produced by thermal decomposition based on two important mechanisms: pyrolysis or incomplete combustion and carbonization processes [11]. Studies by Gebara et al [29], indicate that the main anthropogenic sources of surface and groundwater contamination by PAH are due to processes of combustion of organic material (particularly the exhaust of diesel and gasoline engines), burning of plant biomass, oil refineries and leakage of oil-derived fuels (gasoline, diesel and lubricating oils).…”

Section: Introductionmentioning

confidence: 99%

“…However, it is necessary to introduce a stage for samples to be pretreated, aiming at the extraction and pre-concentration of these contaminants (analyte), allowing the elimination of interfering compounds that may compromise the instrumental analytical technique used [29]. Thus, sample preparation significantly contributes for low limits of detection and high selectivity are achieved in chemical analysis [30].…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous determination of 16 polycyclic aromatic hydrocarbons in groundwater by GC-FID after solid-phase extraction

2019

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Groundwater contamination by polycyclic aromatic hydrocarbons (PAH) may pose a risk to human health, as these compounds are considered to be highly toxic, carcinogenic and/or mutagenic and bioaccumulative. The aim of this study was to evaluate and determine PAH levels in groundwater samples collected from tubular wells in a city of northern Brazil by gas chromatography with flame ionization detector (GC-FID) used by the population for consumption. Sample pre-treatment using solid-phase extraction cartridges was performed in order to promote an enrichment of the PAH fraction of interest and to remove interferences from the matrix to further determine PAH in samples by GC-FID. The results obtained showed that all groundwater samples studied presented PAH levels lower than maximum values allowed by MS 2914/2011 and CONAMA 396/2008. The developed procedure is characterized by low limits of detection and quantification, equal to 0.024-0.113 µg L −1 and 0.079-0.378 μg L −1 , respectively, good linearity (r 2 > 0.99). The recoveries obtained for 16 PAH by the addition and recovery method ranged from 85.4 to 105.7% with good precision (RSD < 5.0%). The results of this study showed that the method developed is fast, accurate and robust with high efficiency for identification and determination of 16 PAH in groundwater samples.

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“…Com isso, é imprescindível realizar o monitoramento das águas subterrâneas para identificar locais contaminados pelos compostos BTEX. Alguns estudos (SILVA et al, 2002;BEZERRA, 2011;GEBARA, 2013) apontam que uma das principais atividades que contribuem para este problema é a revenda varejista de combustível automotivo (postos de gasolina), uma vez que nestes locais a forma de armazenamento é feita por meio de tanques subterrâneos.…”

Section: Introductionunclassified

Avaliação do uso da cromatografia gasosa para detecção de hidrocarbonetos monoaromáticos na água subterrânea na região norte do município de Fortaleza (CE)

et al. 2016

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A contaminação das águas subterrâneas por derivados do petróleo, como a gasolina é um dos principais impactos causados pela atividade comercial varejista de revenda de combustíveis automotivos. Uma das formas de se detectar esse tipo de impacto é realizar a caracterização da qualidade das águas subterrâneas próximas a esses locais quanto à presença de hidrocarbonetos monoaromáticos, como benzeno, tolueno, etilbenzeno e os isômeros do xileno (BTEX). Nesse sentido, buscou-se caracterizar a qualidade da água subterrânea quanto à presença de BTEX na região norte do município de Fortaleza - CE, área de estudo desta pesquisa. Para isso, foi implantada a metodologia analítica de detecção dos BTEX por cromatografia gasosa, acoplada aos detectores PID (fotoionização) e FID (ionização em chama), antecedida da técnica de pré-concentração da amostra headspace estático. O método foi validado através da avaliação dos parâmetros seletividade, linearidade, precisão (repetibilidade), exatidão (recuperação), limite de detecção (LD) e limite de quantificação (LQ). A amostragem da água subterrânea foi realizada pelo método de baixa-vazão, conforme a norma ABNT NBR 15847/2010, com o auxílio de um sistema de amostragem automatizado - Low-Flow Sampling, em 11 poços de monitoramento. O método analítico mostrou-se bastante seletivo, repetitivo, linear, apresentou boa recuperação (70 a 110%) e baixos limites de detecção (0,01 a 0,08 µg/L) e limite de quantificação (0,04 a 0,32 µg/L). Os compostos BTEX foram detectados em todos os poços monitorados, entretanto as concentrações medidas ficaram muito a baixo dos valores máximos estabelecidos pela Resolução CONAMA 396/2008, que é de 5 µg.L-1, 170 µg.L-1, 200 µg.L-1 e 300µg.L-1, para o benzeno, tolueno, etilbenzeno e xilenos, respectivamente.

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Métodos para análises de HPA e BTEX em águas subterrâneas de postos de revenda de combustíveis: um estudo de caso em Campo Grande, MS, Brasil

Cited by 9 publications

References 21 publications

Evaluation of Toluene Adsorption by Porous Resins: Batch and Continuous Flow Studies

Evaluation of Toluene Adsorption by Porous Resins: Batch and Continuous Flow Studies

Simultaneous determination of 16 polycyclic aromatic hydrocarbons in groundwater by GC-FID after solid-phase extraction

Avaliação do uso da cromatografia gasosa para detecção de hidrocarbonetos monoaromáticos na água subterrânea na região norte do município de Fortaleza (CE)

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