The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform

Qinhan Jin - One of the best experts on this subject based on the ideXlab platform.

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

  • Laser microanalysis of geological samples by Atomic Emission Spectrometry (LM-AES) and inductively coupled plasma-Atomic Emission Spectrometry (LM-ICP-AES)
    Chemical Geology, 1992
    Co-Authors: Lieselotte Moenke-blankenburg, Detlef Günther
    Abstract:

    Abstract Recent advances in laser microanalysis techniques and their application to selected geochemical case studies are presented: 1. (1) A single-step method is described for determining the distribution of major and minor elements in ferromanganese concretions by laser microvaporization-Atomic Emission Spectrometry (LM-AES). Some results of the distribution of Ba, Fe and Mn and their linear correlation are discussed. The detection of periodicities in a line scan in the presence of noise is made possible by means of auto-correlation and cross-correlation techniques. 2. (2) A two-step method is presented for determining the bulk content of La in pseudobrookite by laser microvaporization-inductively coupled plasma-Atomic Emission Spectrometry (LM-ICP-AES). Calibration is undertaken with liquid standards using Ti as an internal standard. Good precision and accuracy have been achieved using this method.

Ahmed Kelzieh - One of the best experts on this subject based on the ideXlab platform.

  • Determination of verapamil in pharmaceutical formulations using Atomic Emission Spectrometry.
    Journal of pharmaceutical and biomedical analysis, 2002
    Co-Authors: Sabry Khalil, Ahmed Kelzieh
    Abstract:

    Ion-associate complexes of verapamil hydrochloride (VpCl) with (Cd(II), Co(II), Mn(II), and Zn(II)) thiocyanates, potassium ferricyanide, and ammonium reineckate are precipitated. The solubility of the solid complexes at the recommended optimum conditions of pH and ionic strength values have been studied. Saturated solutions of each ion associate at different temperatures under the optimum precipitation conditions were prepared and the metal ion contents in the supernatant were determined. The solubility products were thus calculated at different temperatures and the thermodynamic parameters DeltaH, DeltaG, and DeltaS were calculated. A new accurate and precise method based on direct coupled plasma Atomic Emission Spectrometry for the determination of VpCl (1.96-62.86 microg ml(-1)) in pure solutions and pharmaceutical preparations is given.

  • Determination of verapamil in pharmaceutical formulations using Atomic Emission Spectrometry.
    Journal of Pharmaceutical and Biomedical Analysis, 2001
    Co-Authors: Sabry Khalil, Ahmed Kelzieh
    Abstract:

    Abstract Ion-associate complexes of verapamil hydrochloride (VpCl) with (Cd(II), Co(II), Mn(II), and Zn(II)) thiocyanates, potassium ferricyanide, and ammonium reineckate are precipitated. The solubility of the solid complexes at the recommended optimum conditions of pH and ionic strength values have been studied. Saturated solutions of each ion associate at different temperatures under the optimum precipitation conditions were prepared and the metal ion contents in the supernatant were determined. The solubility products were thus calculated at different temperatures and the thermodynamic parameters Δ H , Δ G , and Δ S were calculated. A new accurate and precise method based on direct coupled plasma Atomic Emission Spectrometry for the determination of VpCl (1.96–62.86 μg ml −1 ) in pure solutions and pharmaceutical preparations is given.

Wenjun Yang - One of the best experts on this subject based on the ideXlab platform.

Lieselotte Moenke-blankenburg - One of the best experts on this subject based on the ideXlab platform.

  • Laser microanalysis of geological samples by Atomic Emission Spectrometry (LM-AES) and inductively coupled plasma-Atomic Emission Spectrometry (LM-ICP-AES)
    Chemical Geology, 1992
    Co-Authors: Lieselotte Moenke-blankenburg, Detlef Günther
    Abstract:

    Abstract Recent advances in laser microanalysis techniques and their application to selected geochemical case studies are presented: 1. (1) A single-step method is described for determining the distribution of major and minor elements in ferromanganese concretions by laser microvaporization-Atomic Emission Spectrometry (LM-AES). Some results of the distribution of Ba, Fe and Mn and their linear correlation are discussed. The detection of periodicities in a line scan in the presence of noise is made possible by means of auto-correlation and cross-correlation techniques. 2. (2) A two-step method is presented for determining the bulk content of La in pseudobrookite by laser microvaporization-inductively coupled plasma-Atomic Emission Spectrometry (LM-ICP-AES). Calibration is undertaken with liquid standards using Ti as an internal standard. Good precision and accuracy have been achieved using this method.