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Jacek Namieśnik - One of the best experts on this subject based on the ideXlab platform.
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Monitoring of odors emitted from stabilized dewatered sludge subjected to aging using proton transfer reaction–mass spectrometry
Environmental Science and Pollution Research, 2019Co-Authors: Hubert Byliński, Radosław J. Barczak, Jacek Gębicki, Jacek NamieśnikAbstract:One of the potential emission sources of odorous compounds from wastewater treatment plants is sludge processing. The odorous compounds released from dewatered sludge can result in odor nuisance. This study concerns the use of flux hood chamber combined with proton transfer reaction—time of flight—mass spectrometry (PTR-MS) technique for periodical monitoring of odorous compounds emitted from aged, stabilized dewatered sludge samples from 2 different wastewater treatment plants located in Pomeranian Voivodeship, Poland. Based on determined concentration of the chemical compounds and olfactory threshold values, theoretical odor concentrations (known also as “odor activity value” or “odor index”) were calculated for 17 selected odorous compounds. As a result, sulfur compounds such as diethyl sulphide, dimethyl sulphide, mEthanethiol, and Ethanethiol were estimated as the most significant chemical compounds responsible for malodorous effect (average results, e.g., mEthanethiol, 178 ou/m^3; diethyl sulphide, 184 ou/m^3). Based on Pearson correlation coefficient, we revealed a correlation between odorous substances emitted from aged, stabilized dewatered sludge cakes. It was revealed that stabilized dewatered sludge still possessed significant amount of odorous compounds and applied measurement technique could be used for monitoring of odor concentration level of selected malodorous compounds.
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Monitoring of odors emitted from stabilized dewatered sludge subjected to aging using proton transfer reaction-mass spectrometry.
Environmental Science and Pollution Research, 2019Co-Authors: Hubert Byliński, Radosław J. Barczak, Jacek Gębicki, Jacek NamieśnikAbstract:One of the potential emission sources of odorous compounds from wastewater treatment plants is sludge processing. The odorous compounds released from dewatered sludge can result in odor nuisance. This study concerns the use of flux hood chamber combined with proton transfer reaction-time of flight-mass spectrometry (PTR-MS) technique for periodical monitoring of odorous compounds emitted from aged, stabilized dewatered sludge samples from 2 different wastewater treatment plants located in Pomeranian Voivodeship, Poland. Based on determined concentration of the chemical compounds and olfactory threshold values, theoretical odor concentrations (known also as "odor activity value" or "odor index") were calculated for 17 selected odorous compounds. As a result, sulfur compounds such as diethyl sulphide, dimethyl sulphide, mEthanethiol, and Ethanethiol were estimated as the most significant chemical compounds responsible for malodorous effect (average results, e.g., mEthanethiol, 178 ou/m3; diethyl sulphide, 184 ou/m3). Based on Pearson correlation coefficient, we revealed a correlation between odorous substances emitted from aged, stabilized dewatered sludge cakes. It was revealed that stabilized dewatered sludge still possessed significant amount of odorous compounds and applied measurement technique could be used for monitoring of odor concentration level of selected malodorous compounds.
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complementary use of gcxgc tof ms and statistics for differentiation of variety in biosolid samples
Monatshefte Fur Chemie, 2018Co-Authors: Hubert Byliński, Tomasz Dymerski, Jacek Gebicki, Jacek NamieśnikAbstract:Formation of biosolid cakes, which are one of the main wastes generated in wastewater treatment plants, is connected with emission of many hazardous chemical compounds, including odoriferous ones. To optimize particular processes of biosolid cake processing, it is necessary to assess chemical composition of the gas mixtures containing the compounds released from the cakes. The paper proposes application of two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GCxGC–TOF–MS) to identification of the compounds released from four main types of biosolid cakes and to quantitative determination of the markers characteristic for particular types of cake. Based on the analysis of variance, the following compounds, which could be potential markers of the investigated biosolid cakes, were selected: 1-propanol, 2-hexanone, toluene, o-xylene, p-xylene, and organosulfur compounds (mEthanethiol, Ethanethiol, dimethyl sulfide, dimethyl disulfide, and diethyl disulfide). Theoretical odour concentrations of four investigated types of biosolid cakes were determined, based on measured concentrations and olfactory thresholds of the aforementioned compounds. The highest concentration was revealed for a primary cake (634 ou/m3 ), whereas the lowest concentration was found for an excess cake (136 ou/m3 ) (ou/m3 —odour unit per m3 ; one odour unit is equivalent to collective odour threshold of odorants mixture present in 1 m3 ). The proposed methodology allows preliminary evaluation of the odour nuisance markers connected with formation of the biosolid cakes, without a need for quantitative analysis of all determined compounds.
Jean-louis Fanlo - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of solid-phase microextraction for time-weighted average sampling of volatile sulfur compounds at ppb concentrations.
Analytical chemistry, 2003Co-Authors: François Lestremau, Fräs Annika T. Andersson, Valérie Desauziers, Jean-louis FanloAbstract:The potential of solid-phase microextraction (SPME) for time-weighted average (TWA) sampling of volatile sulfur compounds in air at ppb concentrations was investigated. The target compounds (hydrogen sulfide, mEthanethiol (MeSH), Ethanethiol (EtSH), dimethyl sulfide (Me2S), and dimethyl disulfide (Me2S2)) were extracted using SPME with a Carboxen−poly(dimethylsiloxane) fiber coating, and diffusion was controlled by keeping the fiber retracted within the needle of the sampling device. The effects of several important experimental variables (air velocity, direction of air flow, analyte concentration, humidity, temperature, extraction time) were studied. The uptake by the fiber was not affected by the direction of the air flow or the air velocity. The effects of concentration, humidity, temperature, and extraction time were examined in experiments with a central composite face design. The results showed that all or most of the investigated parameters had a significant impact on the uptake rates of H2S, MeSH,...
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development of a quantification method for the analysis of malodorous sulphur compounds in gaseous industrial effluents by solid phase microextraction and gas chromatography pulsed flame photometric detection
Journal of Chromatography A, 2003Co-Authors: François Lestremau, Valérie Desauziers, Jeanclaude Roux, Jean-louis FanloAbstract:A quantification method for malodorous sulphur compounds in gaseous industrial effluents using solid-phase microextraction sampling followed by gas chromatography–pulsed flame photometric detection has been developed. A comparative study showed that polydimethylsiloxane–Carboxen fibre led to sufficient sensitivity to achieve the μg m−3 human perception levels of the five analytes studied (hydrogen sulphide, mEthanethiol, Ethanethiol, dimethyl sulphide, dimethyl disulphide). However, this coating is known to suffer from competitive adsorption, which may lead to inaccurate quantification. Therefore, external calibration can only be used under a limited range of concentrations, which were determined from Fick’s diffusion law. This approach was tested on a real gaseous sample and compared with the standard addition method. Good correlations were found for Ethanethiol, dimethyl sulphide and dimethyl disulphide. However, for more volatile sulphur compounds (i.e., hydrogen sulphide and mEthanethiol), the easy-to-use external calibration could not be applied and standard additions had to be performed for accurate quantification.
François Lestremau - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of solid-phase microextraction for time-weighted average sampling of volatile sulfur compounds at ppb concentrations.
Analytical chemistry, 2003Co-Authors: François Lestremau, Fräs Annika T. Andersson, Valérie Desauziers, Jean-louis FanloAbstract:The potential of solid-phase microextraction (SPME) for time-weighted average (TWA) sampling of volatile sulfur compounds in air at ppb concentrations was investigated. The target compounds (hydrogen sulfide, mEthanethiol (MeSH), Ethanethiol (EtSH), dimethyl sulfide (Me2S), and dimethyl disulfide (Me2S2)) were extracted using SPME with a Carboxen−poly(dimethylsiloxane) fiber coating, and diffusion was controlled by keeping the fiber retracted within the needle of the sampling device. The effects of several important experimental variables (air velocity, direction of air flow, analyte concentration, humidity, temperature, extraction time) were studied. The uptake by the fiber was not affected by the direction of the air flow or the air velocity. The effects of concentration, humidity, temperature, and extraction time were examined in experiments with a central composite face design. The results showed that all or most of the investigated parameters had a significant impact on the uptake rates of H2S, MeSH,...
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development of a quantification method for the analysis of malodorous sulphur compounds in gaseous industrial effluents by solid phase microextraction and gas chromatography pulsed flame photometric detection
Journal of Chromatography A, 2003Co-Authors: François Lestremau, Valérie Desauziers, Jeanclaude Roux, Jean-louis FanloAbstract:A quantification method for malodorous sulphur compounds in gaseous industrial effluents using solid-phase microextraction sampling followed by gas chromatography–pulsed flame photometric detection has been developed. A comparative study showed that polydimethylsiloxane–Carboxen fibre led to sufficient sensitivity to achieve the μg m−3 human perception levels of the five analytes studied (hydrogen sulphide, mEthanethiol, Ethanethiol, dimethyl sulphide, dimethyl disulphide). However, this coating is known to suffer from competitive adsorption, which may lead to inaccurate quantification. Therefore, external calibration can only be used under a limited range of concentrations, which were determined from Fick’s diffusion law. This approach was tested on a real gaseous sample and compared with the standard addition method. Good correlations were found for Ethanethiol, dimethyl sulphide and dimethyl disulphide. However, for more volatile sulphur compounds (i.e., hydrogen sulphide and mEthanethiol), the easy-to-use external calibration could not be applied and standard additions had to be performed for accurate quantification.
Radosław J. Barczak - One of the best experts on this subject based on the ideXlab platform.
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Monitoring of odors emitted from stabilized dewatered sludge subjected to aging using proton transfer reaction–mass spectrometry
Environmental Science and Pollution Research, 2019Co-Authors: Hubert Byliński, Radosław J. Barczak, Jacek Gębicki, Jacek NamieśnikAbstract:One of the potential emission sources of odorous compounds from wastewater treatment plants is sludge processing. The odorous compounds released from dewatered sludge can result in odor nuisance. This study concerns the use of flux hood chamber combined with proton transfer reaction—time of flight—mass spectrometry (PTR-MS) technique for periodical monitoring of odorous compounds emitted from aged, stabilized dewatered sludge samples from 2 different wastewater treatment plants located in Pomeranian Voivodeship, Poland. Based on determined concentration of the chemical compounds and olfactory threshold values, theoretical odor concentrations (known also as “odor activity value” or “odor index”) were calculated for 17 selected odorous compounds. As a result, sulfur compounds such as diethyl sulphide, dimethyl sulphide, mEthanethiol, and Ethanethiol were estimated as the most significant chemical compounds responsible for malodorous effect (average results, e.g., mEthanethiol, 178 ou/m^3; diethyl sulphide, 184 ou/m^3). Based on Pearson correlation coefficient, we revealed a correlation between odorous substances emitted from aged, stabilized dewatered sludge cakes. It was revealed that stabilized dewatered sludge still possessed significant amount of odorous compounds and applied measurement technique could be used for monitoring of odor concentration level of selected malodorous compounds.
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Monitoring of odors emitted from stabilized dewatered sludge subjected to aging using proton transfer reaction-mass spectrometry.
Environmental Science and Pollution Research, 2019Co-Authors: Hubert Byliński, Radosław J. Barczak, Jacek Gębicki, Jacek NamieśnikAbstract:One of the potential emission sources of odorous compounds from wastewater treatment plants is sludge processing. The odorous compounds released from dewatered sludge can result in odor nuisance. This study concerns the use of flux hood chamber combined with proton transfer reaction-time of flight-mass spectrometry (PTR-MS) technique for periodical monitoring of odorous compounds emitted from aged, stabilized dewatered sludge samples from 2 different wastewater treatment plants located in Pomeranian Voivodeship, Poland. Based on determined concentration of the chemical compounds and olfactory threshold values, theoretical odor concentrations (known also as "odor activity value" or "odor index") were calculated for 17 selected odorous compounds. As a result, sulfur compounds such as diethyl sulphide, dimethyl sulphide, mEthanethiol, and Ethanethiol were estimated as the most significant chemical compounds responsible for malodorous effect (average results, e.g., mEthanethiol, 178 ou/m3; diethyl sulphide, 184 ou/m3). Based on Pearson correlation coefficient, we revealed a correlation between odorous substances emitted from aged, stabilized dewatered sludge cakes. It was revealed that stabilized dewatered sludge still possessed significant amount of odorous compounds and applied measurement technique could be used for monitoring of odor concentration level of selected malodorous compounds.
Daiane Dias - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous Determination of Ethanethiol, Inorganic Sulfide, and Sulfite in Wines by Cathodic Stripping Voltammetry
Food Analytical Methods, 2017Co-Authors: Ananda Guarda, Bruna Avila Wiethan, Juliana Villela Maciel, Alexandre Schneider, Paulo Cícero Nascimento, Daiane DiasAbstract:This paper deals with the simultaneous determination of Ethanethiol, inorganic sulfide, and sulfite in wines using cathodic stripping voltammetry. Under the optimized experimental conditions, a linear response to Ethanethiol (0.2 to 0.6 mg L^−1), inorganic sulfide (0.016 to 0.048 mg L^−1), and sulfite (1.5 to 4.5 mg L^−1) were obtained with correlation values R ^2 above 0.985. A detection limit of 0.3, 0.2, and 10 μg L^−1 was obtained to Ethanethiol, inorganic sulfide, and sulfite, respectively. The recovery values obtained were between 78 and 104 % to Ethanethiol, 88 and 108 % to inorganic sulfide, and 87 and 102 % to sulfite. The highest levels of Ethanethiol, inorganic sulfide, and sulfite obtained in the samples were 4.85, 0.44, and 44.72 mg L^−1, respectively. Besides, this method does not suffer interference from other compounds naturally present in the samples, and it enables fast and reliable determination of these sulfur compounds in wines, with minimal sample pretreatment.
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INFLUENCE OF Ethanethiol IN ANTIOXIDANT ACTIVITY AND IN TOTAL PHENOLICS CONCENTRATION OF WINES. COMPARATIVE STUDY AGAINST CONTROL SAMPLES
Journal of Food Quality, 2013Co-Authors: Daiane Dias, Denise Bohrer, Leandro M. De Carvalho, Ananda Guarda, Bruna Avila Wiethan, Luís E. Claussen, Paulo Cícero Do NascimentoAbstract:The redox behavior of Ethanethiol in wines was studied considering its action in presence of resveratrol and gallic acid, as well as its influence on both antioxidant activity and the values of phenol total in wines (red, white and rose). Ethanethiol acted as antioxidant in presence of resveratrol and gallic acid. Conversely, Ethanethiol acted as oxidant in wine samples. This antagonism was explained by the ability of Ethanethiol being stable in reduced and oxidized forms and also due the presence of several redox couples in wines. The action of Ethanethiol was evaluated by following during 60 days the variations on the antioxidant activity (diphenyl-1-picrylhydrazyl method) as well as the total phenol (spectrophotometric method) in fortified wine samples. Control samples were also included in the study. Significant influence of Ethanethiol on the total phenol was observed in all samples, while the antioxidant activity was affected only in white and rose wines. Practical Applications Wine consumption has been growing in recent years and nowadays this drink is appreciated almost all over the word. The main reason for that are the beneficial effects for human health. A large set of species take part in wine composition including also sulfur compounds. Among these compounds Ethanethiol play an important role, since it can generate unpleasant smell with changes in the organoleptic proprieties affecting the final quality of wines. In the present work, we investigate the influence of Ethanethiol on both the antioxidant activity and the phenol total concentration of wines.
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Voltammetric Determination of Low-Molecular-Weight Sulfur Compounds in Hydrothermal Vent Fluids - Studies with Hydrogen Sulfide, MEthanethiol, Ethanethiol and Propanethiol
Electroanalysis, 2010Co-Authors: Daiane Dias, Paulo Cícero Do Nascimento, Cristiane Luisa Jost, Denise Bohrer, Leandro M. De Carvalho, Andrea KoschinskyAbstract:Determination of sulfide compounds in hydrothermal vent fluid samples was performed by DPCSV. The methodology was applied to speciate sulfides via primitive and first-derivative curve interpretation. Hydrogen sulfide, mEthanethiol, and propanethiol were simultaneously assayed in samples containing no Ethanethiol. In the presence of Ethanethiol, the organic sulfides were determined without speciation. Sulfides were determined in an acidic electrolyte, and detection limits ranging from 0.1 to 1.1 μmol L−1 were calculated. The method was tested in real hydrothermal vent fluid samples, with recoveries ranging from 86.9% (R–SH) to 115.3% (H2S). Interference of the metallic species present in seawater was investigated.
