The Experts below are selected from a list of 40236 Experts worldwide ranked by ideXlab platform
Jailson B De Andrade - One of the best experts on this subject based on the ideXlab platform.
-
a simple comprehensive and miniaturized Solvent Extraction Method for determination of particulate phase polycyclic aromatic compounds in air
Journal of Chromatography A, 2016Co-Authors: Aldenor Gomes Santos, Ana Carla D Regis, Gisele O Da Rocha, Marcos Almeida Bezerra, Robson M De Jesus, Jailson B De AndradeAbstract:Abstract The Method allowed simultaneous characterization of PAHs, nitro-PAHs and quinones in atmospheric particulate matter. This Method employs a miniaturized micro-Extraction step that uses 500 μL of an acetonitrile–dichloromethane mix and instrumental analysis by means of a high-resolution GC–MS. The Method was validated using the SRM1649b NIST standard reference material as well as deuterated internal standards. The results are in good agreement with the certified values and show recoveries between 75% and 145%. Limit of detection (LOD) values for PAHs were found to be between 0.5 pg (benzo[a]pyrene) to 2.1 pg (dibenzo[a,h]anthracene), for nitro-PAHs ranged between 3.2 pg (1-nitrobenzo[e]pyrene) and 22.2 pg (3-nitrophenanthrene), and for quinones ranged between 11.5 pg (1,4-naphthoquinone) and 458 pg (9,10-phenanthraquinone). The validated Method was applied to real PM10 samples collected on quartz fiber filters. Concentrations in the PM10 samples ranged from 0.06 to 15 ng m−3 for PAHs, from
-
a simple comprehensive and miniaturized Solvent Extraction Method for determination of particulate phase polycyclic aromatic compounds in air
Journal of Chromatography A, 2016Co-Authors: Aldenor Gomes Santos, Ana Carla D Regis, Gisele O Da Rocha, Marcos Almeida Bezerra, Robson M De Jesus, Jailson B De AndradeAbstract:The Method allowed simultaneous characterization of PAHs, nitro-PAHs and quinones in atmospheric particulate matter. This Method employs a miniaturized micro-Extraction step that uses 500 μL of an acetonitrile-dichloromethane mix and instrumental analysis by means of a high-resolution GC-MS. The Method was validated using the SRM1649b NIST standard reference material as well as deuterated internal standards. The results are in good agreement with the certified values and show recoveries between 75% and 145%. Limit of detection (LOD) values for PAHs were found to be between 0.5 pg (benzo[a]pyrene) to 2.1 pg (dibenzo[a,h]anthracene), for nitro-PAHs ranged between 3.2 pg (1-nitrobenzo[e]pyrene) and 22.2 pg (3-nitrophenanthrene), and for quinones ranged between 11.5 pg (1,4-naphthoquinone) and 458 pg (9,10-phenanthraquinone). The validated Method was applied to real PM10 samples collected on quartz fiber filters. Concentrations in the PM10 samples ranged from 0.06 to 15 ng m(-3) for PAHs, from
Kouichi Miura - One of the best experts on this subject based on the ideXlab platform.
-
enhancement of gasification reactivity of low rank coal through high temperature Solvent treatment
Energy & Fuels, 2014Co-Authors: Xian Li, Ryuichi Ashida, Mitsunori Makino, Atsushi Nishida, Kouichi MiuraAbstract:We have recently proposed a degradative Solvent Extraction Method to upgrade and fractionate various types of low-rank coals by a nonpolar Solvent at temperatures below 350 °C. The main products obtained are Solvent-soluble fractions (extracts) and an insoluble fraction, which we call “upgraded coal (UC)”. The UC samples were prepared from eight low-rank coals and one bituminous coal in this work. It was found that the gasification reactivities of the UC chars prepared from seven coals of the eight low-rank coals were larger than those of the raw coal chars. The CO2 gasification rates of the UC chars prepared from an Australian brown coal, Loy Yang (LY/UC), and an Australian bituminous coal, Gregory (GR/UC), were surprisingly larger than the gasification rates of the corresponding raw coal chars by 2.4–1.9 times. The mechanism of gasification reactivity enhancement was examined from the viewpoints of the catalytic effect of coal inherent minerals, pore surface area, and carbon structure of the chars. The ...
-
preparation of high grade carbonaceous materials having similar chemical and physical properties from various low rank coals by degradative Solvent Extraction
Energy & Fuels, 2012Co-Authors: Ryuichi Ashida, Kouichi MiuraAbstract:Eight kinds of low-rank coals including lignites and sub-bituminous coals were subjected to a degradative Solvent Extraction Method that treats carbonaceous resources in a non-hydrogen donor at around 350 °C. The low-rank coals were separated into the residue which cannot be extracted by Solvent at 350 °C (termed residue), the fraction which can be extracted at 350 °C but precipitates from Solvent at room temperature (deposit), the fraction which is Solvent soluble even at room temperature (soluble), and liquid fraction mainly consisting of water and gaseous products mainly consisting of CO2. The soluble fraction was finally recovered as solid by removing Solvent. The moisture of the coals was completely removed without phase change, and the ash was almost completely concentrated in the residue. The carbon based yields of the three solid fractions were 19.4–31.2% as solubles, 4.2–16.8% as deposits, and 54.7–69.2% as residues when 1-methylnaphthalene was used as the non-hydrogen donor Solvent. Overall, mor...
Aldenor Gomes Santos - One of the best experts on this subject based on the ideXlab platform.
-
a simple comprehensive and miniaturized Solvent Extraction Method for determination of particulate phase polycyclic aromatic compounds in air
Journal of Chromatography A, 2016Co-Authors: Aldenor Gomes Santos, Ana Carla D Regis, Gisele O Da Rocha, Marcos Almeida Bezerra, Robson M De Jesus, Jailson B De AndradeAbstract:Abstract The Method allowed simultaneous characterization of PAHs, nitro-PAHs and quinones in atmospheric particulate matter. This Method employs a miniaturized micro-Extraction step that uses 500 μL of an acetonitrile–dichloromethane mix and instrumental analysis by means of a high-resolution GC–MS. The Method was validated using the SRM1649b NIST standard reference material as well as deuterated internal standards. The results are in good agreement with the certified values and show recoveries between 75% and 145%. Limit of detection (LOD) values for PAHs were found to be between 0.5 pg (benzo[a]pyrene) to 2.1 pg (dibenzo[a,h]anthracene), for nitro-PAHs ranged between 3.2 pg (1-nitrobenzo[e]pyrene) and 22.2 pg (3-nitrophenanthrene), and for quinones ranged between 11.5 pg (1,4-naphthoquinone) and 458 pg (9,10-phenanthraquinone). The validated Method was applied to real PM10 samples collected on quartz fiber filters. Concentrations in the PM10 samples ranged from 0.06 to 15 ng m−3 for PAHs, from
-
a simple comprehensive and miniaturized Solvent Extraction Method for determination of particulate phase polycyclic aromatic compounds in air
Journal of Chromatography A, 2016Co-Authors: Aldenor Gomes Santos, Ana Carla D Regis, Gisele O Da Rocha, Marcos Almeida Bezerra, Robson M De Jesus, Jailson B De AndradeAbstract:The Method allowed simultaneous characterization of PAHs, nitro-PAHs and quinones in atmospheric particulate matter. This Method employs a miniaturized micro-Extraction step that uses 500 μL of an acetonitrile-dichloromethane mix and instrumental analysis by means of a high-resolution GC-MS. The Method was validated using the SRM1649b NIST standard reference material as well as deuterated internal standards. The results are in good agreement with the certified values and show recoveries between 75% and 145%. Limit of detection (LOD) values for PAHs were found to be between 0.5 pg (benzo[a]pyrene) to 2.1 pg (dibenzo[a,h]anthracene), for nitro-PAHs ranged between 3.2 pg (1-nitrobenzo[e]pyrene) and 22.2 pg (3-nitrophenanthrene), and for quinones ranged between 11.5 pg (1,4-naphthoquinone) and 458 pg (9,10-phenanthraquinone). The validated Method was applied to real PM10 samples collected on quartz fiber filters. Concentrations in the PM10 samples ranged from 0.06 to 15 ng m(-3) for PAHs, from
Wei Chen - One of the best experts on this subject based on the ideXlab platform.
-
automated accelerated Solvent Extraction Method for total lipid analysis of microalgae
Algal Research-Biomass Biofuels and Bioproducts, 2020Co-Authors: Wei Chen, Yongmei Liu, Lirong Song, Milton R SommerfeldAbstract:Abstract For algae-based biofuel researches, it is usually necessary to extract and quantitatively measure total lipids. The most popular total lipid determination Methods for tissues are Solvent-based Methods with either manual or Soxhlet Extraction. Although some investigators have modified these traditional Methods, the modifications have rarely been specified in detail, nor has their effectiveness been critically evaluated on microalgae biomass. As a result, there are often significant differences in the analyses of total lipid contents among investigators and laboratories. To assess the effectiveness of different total lipid Extraction protocols for microalgae, several conventional lipid Extraction Methods were systematically compared with an accelerated Solvent Extraction (ASE) Method. Optimal conditions for the ASE Method were determined to be three cycles of 3 min at 125 °C using a 5 ml Extraction cell containing 20 to 150 mg of dry algal biomass. Critical comparisons and assessments of these total lipid Extraction Methods from microalgae were performed for both total lipid Extraction efficiency and extracted lipid quality (lipid decomposition and oxidation). Results obtained from five algal species indicated that hot Soxhlet Extraction and ASE were comparable in total lipid Extraction efficiencies, which were higher than the efficiencies obtained from conventional manual Extraction Methods. However, lipid oxidation resulting from different Extraction Methods indicated that continuous heating with a hot Soxhlet Extraction Method could lead to lipid oxidation. Considering the efficiency and quality of the extracted lipids, Extraction time, Extraction steps and consumed Solvent volumes, ASE is a very promising Method for total lipid Extraction and analysis of lipids from microalgal biomass.
Ryuichi Ashida - One of the best experts on this subject based on the ideXlab platform.
-
enhancement of gasification reactivity of low rank coal through high temperature Solvent treatment
Energy & Fuels, 2014Co-Authors: Xian Li, Ryuichi Ashida, Mitsunori Makino, Atsushi Nishida, Kouichi MiuraAbstract:We have recently proposed a degradative Solvent Extraction Method to upgrade and fractionate various types of low-rank coals by a nonpolar Solvent at temperatures below 350 °C. The main products obtained are Solvent-soluble fractions (extracts) and an insoluble fraction, which we call “upgraded coal (UC)”. The UC samples were prepared from eight low-rank coals and one bituminous coal in this work. It was found that the gasification reactivities of the UC chars prepared from seven coals of the eight low-rank coals were larger than those of the raw coal chars. The CO2 gasification rates of the UC chars prepared from an Australian brown coal, Loy Yang (LY/UC), and an Australian bituminous coal, Gregory (GR/UC), were surprisingly larger than the gasification rates of the corresponding raw coal chars by 2.4–1.9 times. The mechanism of gasification reactivity enhancement was examined from the viewpoints of the catalytic effect of coal inherent minerals, pore surface area, and carbon structure of the chars. The ...
-
preparation of high grade carbonaceous materials having similar chemical and physical properties from various low rank coals by degradative Solvent Extraction
Energy & Fuels, 2012Co-Authors: Ryuichi Ashida, Kouichi MiuraAbstract:Eight kinds of low-rank coals including lignites and sub-bituminous coals were subjected to a degradative Solvent Extraction Method that treats carbonaceous resources in a non-hydrogen donor at around 350 °C. The low-rank coals were separated into the residue which cannot be extracted by Solvent at 350 °C (termed residue), the fraction which can be extracted at 350 °C but precipitates from Solvent at room temperature (deposit), the fraction which is Solvent soluble even at room temperature (soluble), and liquid fraction mainly consisting of water and gaseous products mainly consisting of CO2. The soluble fraction was finally recovered as solid by removing Solvent. The moisture of the coals was completely removed without phase change, and the ash was almost completely concentrated in the residue. The carbon based yields of the three solid fractions were 19.4–31.2% as solubles, 4.2–16.8% as deposits, and 54.7–69.2% as residues when 1-methylnaphthalene was used as the non-hydrogen donor Solvent. Overall, mor...