The Experts below are selected from a list of 86391 Experts worldwide ranked by ideXlab platform

Carlos Angelo Nunes - One of the best experts on this subject based on the ideXlab platform.

Tao Lű - One of the best experts on this subject based on the ideXlab platform.

Joseph A Caruso - One of the best experts on this subject based on the ideXlab platform.

  • capillary electrophoresis Inductively Coupled Plasma mass spectrometry an attractive complementary technique for elemental speciation analysis
    Journal of Chromatography A, 2002
    Co-Authors: Sasi S. Kannamkumarath, Clayton Bhymer, Kazimierz Wrobel, Katarzyna Wrobel, Joseph A Caruso
    Abstract:

    Abstract Some basic and practical aspects of interfacing capillary electrophoresis to Inductively Coupled Plasma-mass spectrometry (CE–ICP-MS) are reviewed in this article with emphasis on the use of this hyphenated technique for elemental speciation analysis. The principles behind the techniques of both CE and ICP-MS are introduced. The interfacing of CE to ICP-MS is discussed including several devices and nebulizers reported in literature. A brief account of their advantages and limitations is given. The various CE–ICP-MS applications for elemental speciation analysis are also reviewed. Some issues concerning the future of CE–ICP-MS for the elemental speciation analyses are discussed.

  • elemental speciation by chromatographic separation with Inductively Coupled Plasma mass spectrometry detection
    Journal of Chromatography A, 2002
    Co-Authors: Claudia Ponce A De Leon, Maria Montesbayon, Joseph A Caruso
    Abstract:

    Separation techniques Coupled to Inductively Coupled Plasma mass spectrometry (ICP-MS) is reviewed. ICP-MS technique is described briefly. Coupling of the different separation techniques are described, together with the most common applications used for each technique that has been described in the literature. An overview for the future of separation techniques Coupled to ICP-MS with regard to elemental speciation is discussed.

  • 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, 1995
    Co-Authors: Francine A Byrdy, Lisa K Olson, Nohora P Vela, Joseph A Caruso
    Abstract:

    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.

Detlef Gunther - One of the best experts on this subject based on the ideXlab platform.

  • a wire signal smoothing device for laser ablation Inductively Coupled Plasma mass spectrometry analysis
    Spectrochimica Acta Part B: Atomic Spectroscopy, 2012
    Co-Authors: Yongsheng Liu, Shan Gao, Shaoquan Xiao, Laishi Zhao, Detlef Gunther, Wen Zhang, Keqing Zong
    Abstract:

    Abstract A novel signal smoothing device for laser ablation Inductively Coupled Plasma mass spectrometry was developed. The “wire” signal smoothing device consists of a copper cylinder filled with steel wire, with an internal volume of approx. 94 cm 3 . The effectiveness of the “wire” signal smoothing device was evaluated with respect to both signal stability and decay time. With the developed “wire” smoothing device, no oscillation of the signal intensity was observed, even at a repetition rate of 1 Hz. This finding indicates that this device is well suited for routine optimization of laser ablation Inductively Coupled Plasma mass spectrometry (LA-ICP-MS). The signal stability was improved by a factor of 11 compared to the absence of a signal smoothing device at a repetition rate of 1 Hz. Another significant advantage of the “wire” smoothing device is that the signal decay time is similar to that without the signal smoothing device. These properties cause the “wire” smoothing device to be well suited for low repetition rate laser ablation analysis, which provides smaller elemental fractionation and better spatial resolution. The proposed “wire” signal smoothing device has been successfully used for high depth resolution zircon dating.

  • laser ablation and arc spark solid sample introduction into Inductively Coupled Plasma mass spectrometers
    Spectrochimica Acta Part B: Atomic Spectroscopy, 1999
    Co-Authors: Detlef Gunther, Simon E Jackson, Henry P Longerich
    Abstract:

    Sample introduction using laser ablation and arc and spark ablation is reviewed. Few references were found in the literature on the use of spark or arc ablation as a sample introduction technique into the ICP-MS and emphasis is therefore placed on the use of laser ablation sampling, particularly for Inductively Coupled Plasma Mass Spectrometry (ICP-MS) detection; however, many of the principles can also be applied to optical emission detection. The applications of the techniques are described, with particular emphasis on micro-sampling of geological materials.

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

  • gold colloid analysis by Inductively Coupled Plasma mass spectrometry in a single particle mode
    Analytica Chimica Acta, 2006
    Co-Authors: C Degueldre, P Y Favarger, Susanna Wold
    Abstract:

    Analysis in a single particle mode of gold colloids in water has been performed by Inductively Coupled Plasma-mass spectrometry (ICP-MS). The signal induced by the flash of ions due to the ionizati ...

  • zirconia colloid analysis by single particle Inductively Coupled Plasma mass spectrometry
    Analytica Chimica Acta, 2004
    Co-Authors: C Degueldre, P Y Favarger, C Bitea
    Abstract:

    Abstract Single particle analysis of zirconia colloids in water has been performed by Inductively Coupled Plasma–mass spectrometry (ICP–MS). The transient signal induced by the flash of ions due to the ionisation of a zirconia colloidal particle in the Plasma torch can be detected and measured for selected zirconium ion masses by the mass spectrometer. The intensity of the MS signal is recorded in time scan. The peaks recorded are analysed as a function of the particle size, and the fraction of the studied element or isotope in the colloid phase. The frequency of the flashes is directly proportional to the concentration of particles in the colloidal suspension. After developing the theoretical aspect on detection, composition and intensity of ion flashes generated by colloid ionisation in the Plasma torch, tests were performed on model zirconia colloids and on silica colloids coated with zirconia. This feasibility study also describes the experimental conditions and the choice of isotopes to detect zirconia colloids in a single particle analysis mode.

  • uranium colloid analysis by single particle Inductively Coupled Plasma mass spectrometry
    Talanta, 2004
    Co-Authors: C Degueldre, P Y Favarger, R Rosse, Susanna Wold
    Abstract:

    Uranium single particle analysis has been performed by Inductively Coupled Plasma-mass spectrometry (ICP-MS) and the performances are compared with that provided by scanning electron microscopy and single particle counting. The transient signal induced by the flash of ions due to the ionisation of an uranium colloidal particle in the Plasma torch can be detected and measured for selected uranium ion masses ((238)U(+), (235)U(+) or (254)[(238)U(16)O](+)) by the mass spectrometer. The signals recorded via time scanning are analysed as a function of particle size or fraction of the studied element or isotope in the colloid phase. The frequency of the flashes is directly proportional to the concentration of particles in the colloidal suspension. The feasibility tests were performed on uranium dioxide particles. The study also describes the experimental conditions and the choice of mass to detect uranium colloids in a single particle analysis mode.