The Experts below are selected from a list of 6162 Experts worldwide ranked by ideXlab platform

Click Corp - One of the best experts on this subject based on the ideXlab platform.

Hilmi Bin Mahmud - One of the best experts on this subject based on the ideXlab platform.

  • chemical stabilization of Scrap Metal yard contaminated soil using ordinary portland cement strength and leachability aspects
    Building and Environment, 2007
    Co-Authors: Ghazaly Bin Shaaban, Hilmi Bin Mahmud
    Abstract:

    In this study, the strength development and lechability aspects of Metal-contaminated soil treated with ordinary portland cement (OPC) were investigated. The soil was collected from a Scrap Metal yard within the outskirts of Kuala Lumpur, Malaysia. Metal composition analysis indicated that the predominant Metals present in the soil were iron (42,194 mg/kg), aluminium (8874 mg/kg), zinc (690 mg/kg), lead (428 mg/kg), copper (107 mg/kg) and chromium (52 mg/kg). The contaminated soil was treated with OPC using cement-to-dry soil (C/Sd) ratios of 0.5, 1 and 2. The effectiveness of the treatment was evaluated by performing unconfined compressive strength (UCS) as well as crushed and whole block leaching (WBL) tests on the treated soil. The treatment results were compared to the solidified waste acceptance criteria which were compiled based on the regulatory waste disposal limit at a disposal site in the United Kingdom and the maximum concentration of contaminants for toxicity characteristic of solid wastes from United States Environmental Protection Agency. Results indicated that chemical stabilization of Metal-contaminated soils using OPC was effective for prevention of Metal leaching from both disintegrated samples subsequent to years of weathering (crushed block) and intact samples (whole block) into the environment.

Maye Klaus - One of the best experts on this subject based on the ideXlab platform.

  • Spatially-resolved uranium isotopic analysis of contaminated Scrap Metal using laser ablation multi-collector ICP-MS
    ROYAL SOC CHEMISTRY, 2019
    Co-Authors: Krachle Michael, Wallenius Maria, Nicholl Adria, Maye Klaus
    Abstract:

    Laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) was applied to the detailed investigation of the uranium (U) isotopic composition (234U, 235U, 236U, and 238U) of five contaminated Scrap Metal samples seized within the European Union. Pressed pellets of the two certified U isotopic reference materials CRM U-020 and CRM U-030 were included in the measurement protocol for mass bias correction, calculation of the gain of the ion counters and for quality assurance. Compared to analysis of pure U compounds such as U ore concentrate (typically >60 wt% U) or UO2 (>80 wt%), the low U content of the investigated Scrap Metal samples (0.15 wt% - 14.3 wt%) required optimised experimental parameters to be applied for U isotopic analysis. Spatially-resolved (a few µm) U isotopic information was obtained by line scan analysis, generating several thousand individual U isotope ratios for each Scrap Metal sample. While complementary analytical techniques such as -spectrometry and thermal ionisation mass spectrometry (TIMS) yielded average U isotopic composition of limited significance, LA-MC-ICP-MS provided substantial added value. The latter highlighted the inhomogeneous distribution of U isotopes within various Scrap Metal samples, giving valuable insights into the history and previous use of the material. Whereas bulk analysis using TIMS revealed an 235U enrichment of ~25.9 wt% in one Scrap Metal, for example, LA-MC-ICP-MS disclosed an average 235U enrichment of ~37.7 wt% (based on >4500 individual measurements), ranging from 0.52 wt% - 94.4 wt%. Four out of five Scrap Metal samples contained 236U (~0.05 wt% - ~0.11 wt%), indicating that reprocessed U from a nuclear facility was involved in materialization of these samples. Taken together, LA-MC-ICP-MS analysis provided fast and accurate spatially-resolved U isotopic information without consuming or altering the Scrap Metal samples, a key feature for nuclear forensic investigations.JRC.G.II.6-Nuclear Safeguards and Forensic

Klaus Mayer - One of the best experts on this subject based on the ideXlab platform.

  • Spatially-resolved uranium isotopic analysis of contaminated Scrap Metal using laser ablation multi-collector ICP-MS
    RSC Advances, 2020
    Co-Authors: Michael Krachler, Maria Wallenius, Adrian Nicholl, Klaus Mayer
    Abstract:

    Laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) was applied to the detailed investigation of the uranium (U) isotopic composition (234U, 235U, 236U, and 238U) of five contaminated Scrap Metal samples found within the European Union. Pressed pellets of the two certified U isotopic reference materials CRM U-020 and CRM U-030 were included in the measurement protocol for mass bias correction, calculation of the ion counter gains and for quality assurance. Since the investigated samples had low U content (0.15–14.3 wt%) compared to typically analysed pure U compounds (>60 wt%), the applied experimental parameters had to be adjusted. Spatially-resolved U isotopic information was obtained by line scan analysis of each sample. While other analytical techniques used typically in nuclear forensic investigations, such as γ-spectrometry and thermal ionisation mass spectrometry (TIMS) yielded average U isotopic compositions of the entire sample, LA-MC-ICP-MS provided substantial added value, highlighting the inhomogeneous distribution of U isotopes within various Scrap Metal samples. Analysis of individual particles via secondary ion mass spectrometry (SIMS) confirmed the large range of 235U enrichment levels in heterogeneous Scrap Metal samples. Four out of five Scrap Metal samples contained 236U (∼0.05–∼0.11 wt%), indicating the presence of reprocessed U. Taken together, LA-MC-ICP-MS analysis provided fast and accurate spatially-resolved U isotopic information without consuming or altering the Scrap Metal samples, a key feature for nuclear forensics investigations.

Ghazaly Bin Shaaban - One of the best experts on this subject based on the ideXlab platform.

  • chemical stabilization of Scrap Metal yard contaminated soil using ordinary portland cement strength and leachability aspects
    Building and Environment, 2007
    Co-Authors: Ghazaly Bin Shaaban, Hilmi Bin Mahmud
    Abstract:

    In this study, the strength development and lechability aspects of Metal-contaminated soil treated with ordinary portland cement (OPC) were investigated. The soil was collected from a Scrap Metal yard within the outskirts of Kuala Lumpur, Malaysia. Metal composition analysis indicated that the predominant Metals present in the soil were iron (42,194 mg/kg), aluminium (8874 mg/kg), zinc (690 mg/kg), lead (428 mg/kg), copper (107 mg/kg) and chromium (52 mg/kg). The contaminated soil was treated with OPC using cement-to-dry soil (C/Sd) ratios of 0.5, 1 and 2. The effectiveness of the treatment was evaluated by performing unconfined compressive strength (UCS) as well as crushed and whole block leaching (WBL) tests on the treated soil. The treatment results were compared to the solidified waste acceptance criteria which were compiled based on the regulatory waste disposal limit at a disposal site in the United Kingdom and the maximum concentration of contaminants for toxicity characteristic of solid wastes from United States Environmental Protection Agency. Results indicated that chemical stabilization of Metal-contaminated soils using OPC was effective for prevention of Metal leaching from both disintegrated samples subsequent to years of weathering (crushed block) and intact samples (whole block) into the environment.