The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Shiuhjen Jiang - One of the best experts on this subject based on the ideXlab platform.
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hydride generation inductively coupled plasma mass spectrometric detection of lead compounds separated by liquid chromatography
Journal of Analytical Atomic Spectrometry, 1995Co-Authors: Hueihjen Yang, Shiuhjen JiangAbstract:A preliminary study of a hydride generation (HG) system as the sample introduction device for an inductively coupled plasma mass spectrometry (ICP-MS) system is described. Samples containing ionic lead compounds were subjected to chromatographic separation before injection into the hydride generator. The species studied included inorganic lead (PbII), trimethyllead and triethyllead. The sensitivity, detection limits and repeatability of the liquid chromatography (LC) ICP-MS system with a hydride generator were comparable to, or better than, those of an LC–ICP-MS system with conventional pneumatic nebulization or other sample introduction techniques. The limits of detection for various lead species were in the range 0.6–6 ng l–1 of lead based on peak area. The concentration of lead compounds in the National Institute of Standards and Technology Standard Reference Material was determined. Lead(II) was the only species in this sample. The results obtained agreed with the certified value.
Joseph A Caruso - One of the best experts on this subject based on the ideXlab platform.
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chromium speciation by anion exchange high performance liquid chromatography with both inductively coupled plasma atomic emission spectroscopic and inductively coupled plasma mass spectrometric detection
Journal of Chromatography A, 1995Co-Authors: Francine A Byrdy, Lisa K Olson, Nohora P Vela, Joseph A CarusoAbstract:Abstract Development of a new method for the determination of Cr(III) and Cr(VI) is described. Anion-exchange high-performance liquid chromatography (HPLC) was used to separate Cr(III) and Cr(VI) with on-line detection by inductively coupled plasma atomic emission spectroscopy (ICP-AES) at 2766 A in preliminary studies, and inductively coupled plasma mass spectrometry (ICP-MS) with single-ion monitoring at m / z 52 and m / z 53 for final work. A mobile phase consisting of ammonium sulfate and ammonium hydroxide was used, and a simple chelation procedure with EDTA was followed to stabilize the Cr(III) species in Standard solutions. ICP-MS results indicated the feasibility of using chromium isotope m / z 53 instead of the more abundant m / z 52 isotope due to a high mobile-phase background most significantly from the SO + polyatomic interferance. The absolute detection limits based on peak-height calculations were 40 pg for Cr(III) and 100 pg for Cr(VI) in aqueous media by HPLC-ICP-MS. The linear dynamic range extended from 5 ppb (ng/ml) to 1 ppm (μg/ml) for both species. By HPLC-ICP-AES, detection limits were 100 ng for Cr(III) and 200 ng for Cr(VI). Cr(III) was detected in NIST-SRM 1643c (National Institute of Standards and Technology-Standard Reference Material, Trace Elements in Water) by HPLC-ICP-MS at the 20 ppb level.
Hueihjen Yang - One of the best experts on this subject based on the ideXlab platform.
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hydride generation inductively coupled plasma mass spectrometric detection of lead compounds separated by liquid chromatography
Journal of Analytical Atomic Spectrometry, 1995Co-Authors: Hueihjen Yang, Shiuhjen JiangAbstract:A preliminary study of a hydride generation (HG) system as the sample introduction device for an inductively coupled plasma mass spectrometry (ICP-MS) system is described. Samples containing ionic lead compounds were subjected to chromatographic separation before injection into the hydride generator. The species studied included inorganic lead (PbII), trimethyllead and triethyllead. The sensitivity, detection limits and repeatability of the liquid chromatography (LC) ICP-MS system with a hydride generator were comparable to, or better than, those of an LC–ICP-MS system with conventional pneumatic nebulization or other sample introduction techniques. The limits of detection for various lead species were in the range 0.6–6 ng l–1 of lead based on peak area. The concentration of lead compounds in the National Institute of Standards and Technology Standard Reference Material was determined. Lead(II) was the only species in this sample. The results obtained agreed with the certified value.
Owen S. Crankshaw - One of the best experts on this subject based on the ideXlab platform.
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Published by Oxford University Press on behalf of the British Occupational Hygiene Society 2014. • 1 Characterization of Lone Pine, California, Tremolite Asbestos and Preparation of Research Material
2016Co-Authors: Owen S. Crankshaw, Stacy S. Doorn, Todd J. Ennis, Sara E. HarrisonAbstract:Well-characterized amphibole asbestos mineral samples are required for use as analytical stand-ards and in future research projects. Currently, the National Institute for Standards and Technology Standard Reference Material samples of asbestos are listed as ‘Discontinued’. The National Institute for Occupational Safety and Health (NIOSH) has a goal under the Asbestos Roadmap of locating and characterizing research materials for future use. Where an initial characterization analysis deter-mines that a collected material is appropriate for use as a research material in terms of composition and asbestiform habit, sufficient amounts of the material will be collected to make it publicly available. An abandoned mine near Lone Pine, California, contains a vein of tremolite asbestos, which was the probable source of a reference material that has been available for the past 17 years from the Health and Safety Laboratory (HSL) in the UK. Newly collected fibrous vein material from this mine was analyzed at Research Triangle Institute (RTI International) with some additional analysis by the US Geological Survey’s Denver Microbeam Laboratory. The analysis at RTI International included: (i) polarized light microscopy (PLM) with a determination of principal optical properties; (ii) X-ray diffraction; (iii) transmission electron microscopy, including energy dispersive X-ray spectroscopy and selected-area electron diffraction; and (iv) spindle stage analysis using PLM to determine whether individual fib
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Published by Oxford University Press on behalf of the British Occupational Hygiene Society 2014. • 91 Characterization of Lone Pine, California, Tremolite Asbestos and Preparation of Research Material
2016Co-Authors: Owen S. Crankshaw, Stacy S. Doorn, Todd J. Ennis, Sara E. HarrisonAbstract:Well-characterized amphibole asbestos mineral samples are required for use as analytical stand-ards and in future research projects. Currently, the National Institute for Standards and Technology Standard Reference Material samples of asbestos are listed as ‘Discontinued’. The National Institute for Occupational Safety and Health (NIOSH) has a goal under the Asbestos Roadmap of locating and characterizing research materials for future use. Where an initial characterization analysis deter-mines that a collected material is appropriate for use as a research material in terms of composition and asbestiform habit, sufficient amounts of the material will be collected to make it publicly available. An abandoned mine near Lone Pine, California, contains a vein of tremolite asbestos, which was the probable source of a reference material that has been available for the past 17 years from the Health and Safety Laboratory (HSL) in the UK. Newly collected fibrous vein material from this mine was analyzed at Research Triangle Institute (RTI International) with some additional analysis by the US Geological Survey’s Denver Microbeam Laboratory. The analysis at RTI International included: (i) polarized light microscopy (PLM) with a determination of principal optical properties; (ii) X-ray diffraction; (iii) transmission electron microscopy, including energy dispersive X-ray spectroscopy and selected-area electron diffraction; and (iv) spindle stage analysis using PLM to determine whether individual fib
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characterization of lone pine california tremolite asbestos and preparation of research material
Annals of Occupational Hygiene, 2015Co-Authors: Martin Harper, Owen S. Crankshaw, Stacy S. Doorn, Todd J. Ennis, Bradley S Van Gosen, Sara HarrisonAbstract:Well-characterized amphibole asbestos mineral samples are required for use as analytical Standards and in future research projects. Currently, the National Institute for Standards and Technology Standard Reference Material samples of asbestos are listed as 'Discontinued'. The National Institute for Occupational Safety and Health (NIOSH) has a goal under the Asbestos Roadmap of locating and characterizing research materials for future use. Where an initial characterization analysis determines that a collected material is appropriate for use as a research material in terms of composition and asbestiform habit, sufficient amounts of the material will be collected to make it publicly available. An abandoned mine near Lone Pine, California, contains a vein of tremolite asbestos, which was the probable source of a reference material that has been available for the past 17 years from the Health and Safety Laboratory (HSL) in the UK. Newly collected fibrous vein material from this mine was analyzed at Research Triangle Institute (RTI International) with some additional analysis by the US Geological Survey's Denver Microbeam Laboratory. The analysis at RTI International included: (i) polarized light microscopy (PLM) with a determination of principal optical properties; (ii) X-ray diffraction; (iii) transmission electron microscopy, including energy dispersive X-ray spectroscopy and selected-area electron diffraction; and (iv) spindle stage analysis using PLM to determine whether individual fibers and bundles of the samples were polycrystalline or single-crystal cleavage fragments. The overall findings of the study indicated that the material is tremolite asbestos with characteristics substantially similar to the earlier distributed HSL reference material. A larger quantity of material was prepared by sorting, acid-washing and mixing for sub-division into vials of ~10g each. These vials have been transferred from NIOSH to RTI International, from where they can be obtained on request.
Sara Harrison - One of the best experts on this subject based on the ideXlab platform.
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characterization of lone pine california tremolite asbestos and preparation of research material
Annals of Occupational Hygiene, 2015Co-Authors: Martin Harper, Owen S. Crankshaw, Stacy S. Doorn, Todd J. Ennis, Bradley S Van Gosen, Sara HarrisonAbstract:Well-characterized amphibole asbestos mineral samples are required for use as analytical Standards and in future research projects. Currently, the National Institute for Standards and Technology Standard Reference Material samples of asbestos are listed as 'Discontinued'. The National Institute for Occupational Safety and Health (NIOSH) has a goal under the Asbestos Roadmap of locating and characterizing research materials for future use. Where an initial characterization analysis determines that a collected material is appropriate for use as a research material in terms of composition and asbestiform habit, sufficient amounts of the material will be collected to make it publicly available. An abandoned mine near Lone Pine, California, contains a vein of tremolite asbestos, which was the probable source of a reference material that has been available for the past 17 years from the Health and Safety Laboratory (HSL) in the UK. Newly collected fibrous vein material from this mine was analyzed at Research Triangle Institute (RTI International) with some additional analysis by the US Geological Survey's Denver Microbeam Laboratory. The analysis at RTI International included: (i) polarized light microscopy (PLM) with a determination of principal optical properties; (ii) X-ray diffraction; (iii) transmission electron microscopy, including energy dispersive X-ray spectroscopy and selected-area electron diffraction; and (iv) spindle stage analysis using PLM to determine whether individual fibers and bundles of the samples were polycrystalline or single-crystal cleavage fragments. The overall findings of the study indicated that the material is tremolite asbestos with characteristics substantially similar to the earlier distributed HSL reference material. A larger quantity of material was prepared by sorting, acid-washing and mixing for sub-division into vials of ~10g each. These vials have been transferred from NIOSH to RTI International, from where they can be obtained on request.