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Average Molecular Weight

The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform

Andrew J. Coleman – 1st expert on this subject based on the ideXlab platform

  • Raoult’s law‐based method for determination of coal tar Average Molecular Weight
    Environmental Toxicology and Chemistry, 2005
    Co-Authors: Derick G. Brown, Lovleen Gupta, Horace K. Moo-young, Andrew J. Coleman

    Abstract:

    A Raoult’s law-based method for determining the number Average Molecular Weight of coal tars is presented. The method requires data from two-phase coal tar/water equilibrium experiments, which readily are performed in environmental laboratories. An advantage of this method for environmental samples is that it is not impacted by the small amount of inert debris often present in coal tar samples obtained from contaminated sites. Results are presented for 10 coal tars from nine former manufactured gas plants located in the eastern United States. Vapor pressure osmometry (VPO) analysis provided similar Average Molecular Weights to those determined with the Raoult’s law-based method, except for one highly viscous coal tar sample. Use of the VPO-based Average Molecular Weight for this coal tar resulted in underprediction of the coal tar constituents’ aqueous concentrations. Additionally, one other coal tar was not completely soluble in solvents used for VPO analysis. The results indicate that the Raoult’s law-based method is able to provide an Average Molecular Weight that is consistent with the intended application of the data (e.g., modeling the dissolution of coal tar constituents into surrounding waters), and this method can be applied to coal tars that may be incompatible with other commonly used methods for determining Average Molecular Weight, such as vapor pressure osmometry.

  • raoult s law based method for determination of coal tar Average Molecular Weight
    Environmental Toxicology and Chemistry, 2005
    Co-Authors: Derick G. Brown, Lovleen Gupta, Horace K Mooyoung, Andrew J. Coleman

    Abstract:

    A Raoult’s law-based method for determining the number Average Molecular Weight of coal tars is presented. The method requires data from two-phase coal tar/water equilibrium experiments, which readily are performed in environmental laboratories. An advantage of this method for environmental samples is that it is not impacted by the small amount of inert debris often present in coal tar samples obtained from contaminated sites. Results are presented for 10 coal tars from nine former manufactured gas plants located in the eastern United States. Vapor pressure osmometry (VPO) analysis provided similar Average Molecular Weights to those determined with the Raoult’s law-based method, except for one highly viscous coal tar sample. Use of the VPO-based Average Molecular Weight for this coal tar resulted in underprediction of the coal tar constituents’ aqueous concentrations. Additionally, one other coal tar was not completely soluble in solvents used for VPO analysis. The results indicate that the Raoult’s law-based method is able to provide an Average Molecular Weight that is consistent with the intended application of the data (e.g., modeling the dissolution of coal tar constituents into surrounding waters), and this method can be applied to coal tars that may be incompatible with other commonly used methods for determining Average Molecular Weight, such as vapor pressure osmometry.

Regis Baron – 2nd expert on this subject based on the ideXlab platform

  • Decrease in dynamic viscosity and Average Molecular Weight of alginate from Laminaria digitata during alkaline extraction
    Journal of Phycology, 2008
    Co-Authors: Peggy Vauchel, Abdellah Arhaliass, Jack Legrand, R. Kaas, Regis Baron

    Abstract:

    Alginates are natural polysaccharides that are extracted from brown seaweeds and widely used for their rheological properties. The central step in the extraction protocol used in the alginate industry is the alkaline extraction, which requires several hours. In this study, a significant decrease in alginate dynamic viscosity was observed after 2 h of alkaline treatment. Intrinsic viscosity and Average Molecular Weight of alginates from alkaline extractions 1–4 h in duration were determined, indicating depolymerization of alginates: Average Molecular Weight decreased significantly during the extraction, falling by a factor of 5 between 1 and 4 h of extraction. These results suggested that reducing extraction time could enable preserving the rheological properties of the extracted alginates.

Derick G. Brown – 3rd expert on this subject based on the ideXlab platform

  • Raoult’s law‐based method for determination of coal tar Average Molecular Weight
    Environmental Toxicology and Chemistry, 2005
    Co-Authors: Derick G. Brown, Lovleen Gupta, Horace K. Moo-young, Andrew J. Coleman

    Abstract:

    A Raoult’s law-based method for determining the number Average Molecular Weight of coal tars is presented. The method requires data from two-phase coal tar/water equilibrium experiments, which readily are performed in environmental laboratories. An advantage of this method for environmental samples is that it is not impacted by the small amount of inert debris often present in coal tar samples obtained from contaminated sites. Results are presented for 10 coal tars from nine former manufactured gas plants located in the eastern United States. Vapor pressure osmometry (VPO) analysis provided similar Average Molecular Weights to those determined with the Raoult’s law-based method, except for one highly viscous coal tar sample. Use of the VPO-based Average Molecular Weight for this coal tar resulted in underprediction of the coal tar constituents’ aqueous concentrations. Additionally, one other coal tar was not completely soluble in solvents used for VPO analysis. The results indicate that the Raoult’s law-based method is able to provide an Average Molecular Weight that is consistent with the intended application of the data (e.g., modeling the dissolution of coal tar constituents into surrounding waters), and this method can be applied to coal tars that may be incompatible with other commonly used methods for determining Average Molecular Weight, such as vapor pressure osmometry.

  • raoult s law based method for determination of coal tar Average Molecular Weight
    Environmental Toxicology and Chemistry, 2005
    Co-Authors: Derick G. Brown, Lovleen Gupta, Horace K Mooyoung, Andrew J. Coleman

    Abstract:

    A Raoult’s law-based method for determining the number Average Molecular Weight of coal tars is presented. The method requires data from two-phase coal tar/water equilibrium experiments, which readily are performed in environmental laboratories. An advantage of this method for environmental samples is that it is not impacted by the small amount of inert debris often present in coal tar samples obtained from contaminated sites. Results are presented for 10 coal tars from nine former manufactured gas plants located in the eastern United States. Vapor pressure osmometry (VPO) analysis provided similar Average Molecular Weights to those determined with the Raoult’s law-based method, except for one highly viscous coal tar sample. Use of the VPO-based Average Molecular Weight for this coal tar resulted in underprediction of the coal tar constituents’ aqueous concentrations. Additionally, one other coal tar was not completely soluble in solvents used for VPO analysis. The results indicate that the Raoult’s law-based method is able to provide an Average Molecular Weight that is consistent with the intended application of the data (e.g., modeling the dissolution of coal tar constituents into surrounding waters), and this method can be applied to coal tars that may be incompatible with other commonly used methods for determining Average Molecular Weight, such as vapor pressure osmometry.