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Solomon Zaromb - One of the best experts on this subject based on the ideXlab platform.

  • A portable high-throughput Liquid-Absorption air sampler for respirable aerosol particles
    Aerosol Science and Technology, 1998
    Co-Authors: Amnon Birenzvige, Agnes N. Akiyemi, Solomon Zaromb
    Abstract:

    ABSTRACT This paper describes a newly developed portable high-throughput Liquid-Absorption air sampler [PHTLAAS], and its effectiveness in capturing respirable particles in the range of 2 μm–10 μm aerodynamic diameter. A detailed description of the sampler and its operation is followed by discussions of the testing procedures and the experimental results. The paper ends with a discussion of some potential applications of this sampler.

  • Detection and Estimation of Part-per-Billion Levels of Formaldehyde Using a Portable High-Throughput Liquid Absorption Air Sampler
    Environmental Science & Technology, 1998
    Co-Authors: C.s. Woo, Stuart E. Barry, Solomon Zaromb
    Abstract:

    In view of the known adverse health effects of formaldehyde and its suspected carcinogenicity, a convenient and simple apparatus for its rapid detection is highly desirable. A portable high-throughput Liquid Absorption air sampler (PHTLAAS) was therefore evaluated for the rapid and ultrasensitive detection of formaldehyde. Controlled concentrations of formaldehyde in air were generated with a constant-drive syringe pump and mixing chamber apparatus and were either sampled by the PHTLAAS, at a rate of about 200 L/min, or fed to two series-connected Liquid impingers. In either case, the formaldehyde was absorbed in a small volume of aqueous sodium bisulfite and measured by the chromotropic acid method. The reddish-purple color of the chromogen formed with chromotropic acid provides a sensitive test for the screening of low levels of formaldehyde in ambient air. Comparison of samples collected from the test sampler with those from the impingers before and after each test yielded PHTLAAS collection efficienci...

  • Detection of airborne cocaine and heroin by high-throughput Liquid-Absorption preconcentration and Liquid chromatography—electrochemical detection
    Journal of Chromatography A, 1993
    Co-Authors: Solomon Zaromb, J. Alcaraz, Daniel B. Lawson, C.s. Woo
    Abstract:

    Abstract A high-throughput Liquid-Absorption preconcentrator (HTLAP) for rapid and/or ultrasensitive detection and analysis of trace contaminants samples air at a rate of 600–700 1/min and collects analytes from vapors or aerosols at an efficiency of 40–60% into a small volume of Liquid absorbent dripping at a rate of 0.1–2 ml/min. These features combine to reduce the lower detection limit (LDL) of available analytical instrumentation by a factor of > 1000 and/or to permit faster sampling and far more rapid on-site air monitoring than were previously practicable. LDLs of ca. 1: 1013 (v/v) of alkaloids have been achieved with LC and electrochemical detection. The HTLAP is directly adaptable to most Liquid-phase analysers. The small rate of Liquid collection is also compatible with available interfaces to mass spectrometers. Moreover, the HTLAP permits detection and quantitation of polar or highly reactive compounds that cannot be readily analyzed by conventional preconcentration and GC.

  • High-throughput Liquid-Absorption air and aerosol sampler
    1991
    Co-Authors: Solomon Zaromb, J. Alcaraz, D. Lawson, K.c. Picel, C.s. Woo
    Abstract:

    A high-throughput Liquid-Absorption preconcentrator (HTLAP) has been developed for rapid and/or ultrasensitive detection and analysis of trace air contaminants. Its advantages result from (a) a high air- sampling rate ({approximately}1 m{sup 3}/min), (b) an appreciable analyte collection efficiency (30--60%) for both vapors and aerosols, and (c) a small volume of Liquid absorbent (collected at a rate of 0. 1--2 mL/min), all of which features combine to reduce the LDL (lower detection limit) of available analytical instrumentation by a factor of >1000 and/or to permit faster sampling and far more rapid on-site air monitoring than were previously practicable. LDLs of {approximately}1:10{sup 13} by volume of alkaloids have been achieved with Liquid chromatography and electrochemical detection. The HTLAP is directly adaptable to most Liquid-phase analyzers. The small rate of Liquid collection is also compatible with available interfaces to mass spectrometers. Moreover, the HTLAP permits detection and quantitation of compounds that cannot be readily analyzed by conventional preconcentration and gas chromatography, e.g., polar or highly reactive analytes, such as primary aromatic amines or hydrazines. High selectivity and/or stabilization of labile of reactive analytes, or entrapment of volatile analytes, may be effected through a proper choice of Liquid absorbent. 8 refs.

Chung Hae Park - One of the best experts on this subject based on the ideXlab platform.

  • modeling of the capillary wicking of flax fibers by considering the effects of fiber swelling and Liquid Absorption
    Journal of Colloid and Interface Science, 2018
    Co-Authors: Guilherme Apolinario Testoni, Sihwan Kim, Anurag Pisupati, Chung Hae Park
    Abstract:

    Abstract We propose a new model for the capillary rise of Liquid in flax fibers whose diameter is changed by Liquid Absorption. Liquid Absorption into the flax fibers is taken into account in a new modified Washburn equation by considering the mass of the Liquid absorbed inside the fibers as well as that imbibed between the fibers. The change of permeability and hydraulic radius of pores in a fibrous medium due to the fiber swelling is modeled by a statistical approach considering a non-uniform distribution of flax fiber diameter. By comparisons between capillary rise test results and modeling results, we prove the validity of the proposed modified Washburn model to take into account the effects from fiber swelling and Liquid Absorption on the decrease of capillary rise velocity. The experimental observation of long-term capillary rise tests show that the swelling behavior of the fibers highly packed in a closed volume and its influence on the capillary wicking are different from those of an individual single fiber in a free space. The current approach was useful to characterize the swelling of fibers highly packed in a closed volume and its influence of the long-term behavior of capillary wicking.

Guilherme Apolinario Testoni - One of the best experts on this subject based on the ideXlab platform.

  • modeling of the capillary wicking of flax fibers by considering the effects of fiber swelling and Liquid Absorption
    Journal of Colloid and Interface Science, 2018
    Co-Authors: Guilherme Apolinario Testoni, Sihwan Kim, Anurag Pisupati, Chung Hae Park
    Abstract:

    Abstract We propose a new model for the capillary rise of Liquid in flax fibers whose diameter is changed by Liquid Absorption. Liquid Absorption into the flax fibers is taken into account in a new modified Washburn equation by considering the mass of the Liquid absorbed inside the fibers as well as that imbibed between the fibers. The change of permeability and hydraulic radius of pores in a fibrous medium due to the fiber swelling is modeled by a statistical approach considering a non-uniform distribution of flax fiber diameter. By comparisons between capillary rise test results and modeling results, we prove the validity of the proposed modified Washburn model to take into account the effects from fiber swelling and Liquid Absorption on the decrease of capillary rise velocity. The experimental observation of long-term capillary rise tests show that the swelling behavior of the fibers highly packed in a closed volume and its influence on the capillary wicking are different from those of an individual single fiber in a free space. The current approach was useful to characterize the swelling of fibers highly packed in a closed volume and its influence of the long-term behavior of capillary wicking.

C.s. Woo - One of the best experts on this subject based on the ideXlab platform.

  • Detection and Estimation of Part-per-Billion Levels of Formaldehyde Using a Portable High-Throughput Liquid Absorption Air Sampler
    Environmental Science & Technology, 1998
    Co-Authors: C.s. Woo, Stuart E. Barry, Solomon Zaromb
    Abstract:

    In view of the known adverse health effects of formaldehyde and its suspected carcinogenicity, a convenient and simple apparatus for its rapid detection is highly desirable. A portable high-throughput Liquid Absorption air sampler (PHTLAAS) was therefore evaluated for the rapid and ultrasensitive detection of formaldehyde. Controlled concentrations of formaldehyde in air were generated with a constant-drive syringe pump and mixing chamber apparatus and were either sampled by the PHTLAAS, at a rate of about 200 L/min, or fed to two series-connected Liquid impingers. In either case, the formaldehyde was absorbed in a small volume of aqueous sodium bisulfite and measured by the chromotropic acid method. The reddish-purple color of the chromogen formed with chromotropic acid provides a sensitive test for the screening of low levels of formaldehyde in ambient air. Comparison of samples collected from the test sampler with those from the impingers before and after each test yielded PHTLAAS collection efficienci...

  • Detection of airborne cocaine and heroin by high-throughput Liquid-Absorption preconcentration and Liquid chromatography—electrochemical detection
    Journal of Chromatography A, 1993
    Co-Authors: Solomon Zaromb, J. Alcaraz, Daniel B. Lawson, C.s. Woo
    Abstract:

    Abstract A high-throughput Liquid-Absorption preconcentrator (HTLAP) for rapid and/or ultrasensitive detection and analysis of trace contaminants samples air at a rate of 600–700 1/min and collects analytes from vapors or aerosols at an efficiency of 40–60% into a small volume of Liquid absorbent dripping at a rate of 0.1–2 ml/min. These features combine to reduce the lower detection limit (LDL) of available analytical instrumentation by a factor of > 1000 and/or to permit faster sampling and far more rapid on-site air monitoring than were previously practicable. LDLs of ca. 1: 1013 (v/v) of alkaloids have been achieved with LC and electrochemical detection. The HTLAP is directly adaptable to most Liquid-phase analysers. The small rate of Liquid collection is also compatible with available interfaces to mass spectrometers. Moreover, the HTLAP permits detection and quantitation of polar or highly reactive compounds that cannot be readily analyzed by conventional preconcentration and GC.

  • High-throughput Liquid-Absorption air and aerosol sampler
    1991
    Co-Authors: Solomon Zaromb, J. Alcaraz, D. Lawson, K.c. Picel, C.s. Woo
    Abstract:

    A high-throughput Liquid-Absorption preconcentrator (HTLAP) has been developed for rapid and/or ultrasensitive detection and analysis of trace air contaminants. Its advantages result from (a) a high air- sampling rate ({approximately}1 m{sup 3}/min), (b) an appreciable analyte collection efficiency (30--60%) for both vapors and aerosols, and (c) a small volume of Liquid absorbent (collected at a rate of 0. 1--2 mL/min), all of which features combine to reduce the LDL (lower detection limit) of available analytical instrumentation by a factor of >1000 and/or to permit faster sampling and far more rapid on-site air monitoring than were previously practicable. LDLs of {approximately}1:10{sup 13} by volume of alkaloids have been achieved with Liquid chromatography and electrochemical detection. The HTLAP is directly adaptable to most Liquid-phase analyzers. The small rate of Liquid collection is also compatible with available interfaces to mass spectrometers. Moreover, the HTLAP permits detection and quantitation of compounds that cannot be readily analyzed by conventional preconcentration and gas chromatography, e.g., polar or highly reactive analytes, such as primary aromatic amines or hydrazines. High selectivity and/or stabilization of labile of reactive analytes, or entrapment of volatile analytes, may be effected through a proper choice of Liquid absorbent. 8 refs.

Kaj Backfolk - One of the best experts on this subject based on the ideXlab platform.

  • Effect of PCC crystallization and morphology on flocculation with microfibrillated cellulose, on sheet densification and Liquid Absorption behavior
    Cellulose, 2020
    Co-Authors: Teija Laukala, Johanna Lyytikäinen, Katriina Mielonen, Kaj Backfolk
    Abstract:

    Composite sheets consisting of elongated and aggregated cationically charged precipitated calcium carbonate (PCC) and native microfibrillated cellulose (MFC) were prepared with a wet laying method. The furnishes were prepared with and without an anionic flocculating agent (polyacrylamide) in order to adjust the structure of the sheet. The samples were compressed (densified) in order to determine the particle and microfibrillated cellulose-PCC structure coalescence and densification, as well as its subsequent influence on Liquid Absorption behavior. The densification affected both the vertical and lateral distribution of PCC, but the flocculating agent enhanced the compression stability and stabilized the sheets against PCC material flow. The differences between the sheets made with and without the flocculation aid affected the Absorption of an anionic dye-based fluid ink, which was evident as a higher print density and less print bleeding. The Absorption behavior was dependent on the sheet structure, especially on the PCC distribution within the sheets. Finally, the role of MFC on floc structure and floc formation is discussed. Graphic abstract