The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform

Khitam Alzughoul - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of elemental distribution and heavy metals contamination in Phosphate Deposits: potential health risk assessment of finer-grained size fraction
    Environmental Geochemistry and Health, 2014
    Co-Authors: Mohammad Al-hwaiti, Mustafa Al Kuisi, Ghazi Saffarini, Khitam Alzughoul
    Abstract:

    The concentrations and chemical distributions of heavy metals (Cd, Cr, Ni, Zn, U, and V) in the Al-Jiza Phosphate ores were investigated. Typically, the mean concentration values of Cd, Cr, Ni, U, and Zn are 15 ± 8, 109 ± 21, 34 ± 6, 211 ± 55, 142 ± 55, and 161 ± 57 mg kg^−1, respectively. On the other hand, the encountered average concentration values of Cd, Cr, Ni, Zn, U, and V in the Phosphate dust particles (

  • assessment of elemental distribution and heavy metals contamination in Phosphate Deposits potential health risk assessment of finer grained size fraction
    Environmental Geochemistry and Health, 2014
    Co-Authors: Mohammad Alhwaiti, Mustafa Al Kuisi, Ghazi Saffarini, Khitam Alzughoul
    Abstract:

    The concentrations and chemical distributions of heavy metals (Cd, Cr, Ni, Zn, U, and V) in the Al-Jiza Phosphate ores were investigated. Typically, the mean concentration values of Cd, Cr, Ni, U, and Zn are 15 ± 8, 109 ± 21, 34 ± 6, 211 ± 55, 142 ± 55, and 161 ± 57 mg kg−1, respectively. On the other hand, the encountered average concentration values of Cd, Cr, Ni, Zn, U, and V in the Phosphate dust particles (<0.053) were found to be 22 ± 5, 179 ± 5, 67 ± 11, 441 ± 14, 225 ± 58, and 311 ± 9 mg kg−1, respectively. The contamination factors of U and Cr are greater than 1, indicating that these heavy metals could be potentially hazardous, if released to the environment. Multivariate statistical analysis allowed the identification of three main factors controlling the distribution of these heavy metals and the other chemical constituents. The extracted factors are as follows: francolite mineral factor, clay minerals factor, and diagenesis factor. Health risk assessments of non-cancerous effects in finer-grained size fraction that might be caused by contamination with the heavy elements have been calculated for both children and adults. The risk assessments in case of children for non-cancerous effects showed that U has values greater than the safe level of hazard index (HI = 1). In case of adults, the value of risk for U is also higher as compared to those of Cd, Ni, Cr, and Zn where it lies within the safe range of hazard index (HI < 1). Child health risk assessment indicates that children are more vulnerable to contaminants from Phosphate mining than adults.

Alan E Koenig - One of the best experts on this subject based on the ideXlab platform.

  • rare earth elements in sedimentary Phosphate Deposits solution to the global ree crisis
    Gondwana Research, 2015
    Co-Authors: Poul Emsbo, Patrick I Mclaughlin, George N Breit, Edward A Du Bray, Alan E Koenig
    Abstract:

    Abstract The critical role of rare earth elements (REEs), particularly heavy REEs (HREEs), in high-tech industries has created a surge in demand that is quickly outstripping known global supply and has triggered a worldwide scramble to discover new sources. The chemical analysis of 23 sedimentary Phosphate Deposits (phosphorites) in the United States demonstrates that they are significantly enriched in REEs. Leaching experiments using dilute H2SO4 and HCl, extracted nearly 100% of their total REE content and show that the extraction of REEs from phosphorites is not subject to the many technological and environmental challenges that vex the exploitation of many identified REE Deposits. Our data suggest that Phosphate rock currently mined in the United States has the potential to produce a significant proportion of the world's REE demand as a byproduct. Importantly, the size and concentration of HREEs in some unmined phosphorites dwarf the world's richest REE Deposits. Secular variation in Phosphate REE contents identifies geologic time periods favorable for the formation of currently unrecognized high-REE Phosphates. The extraordinary endowment, combined with the ease of REE extraction, indicates that such phosphorites might be considered as a primary source of REEs with the potential to resolve the global REE (particularly for HREE) supply shortage.

Mustafa Al Kuisi - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of elemental distribution and heavy metals contamination in Phosphate Deposits: potential health risk assessment of finer-grained size fraction
    Environmental Geochemistry and Health, 2014
    Co-Authors: Mohammad Al-hwaiti, Mustafa Al Kuisi, Ghazi Saffarini, Khitam Alzughoul
    Abstract:

    The concentrations and chemical distributions of heavy metals (Cd, Cr, Ni, Zn, U, and V) in the Al-Jiza Phosphate ores were investigated. Typically, the mean concentration values of Cd, Cr, Ni, U, and Zn are 15 ± 8, 109 ± 21, 34 ± 6, 211 ± 55, 142 ± 55, and 161 ± 57 mg kg^−1, respectively. On the other hand, the encountered average concentration values of Cd, Cr, Ni, Zn, U, and V in the Phosphate dust particles (

  • assessment of elemental distribution and heavy metals contamination in Phosphate Deposits potential health risk assessment of finer grained size fraction
    Environmental Geochemistry and Health, 2014
    Co-Authors: Mohammad Alhwaiti, Mustafa Al Kuisi, Ghazi Saffarini, Khitam Alzughoul
    Abstract:

    The concentrations and chemical distributions of heavy metals (Cd, Cr, Ni, Zn, U, and V) in the Al-Jiza Phosphate ores were investigated. Typically, the mean concentration values of Cd, Cr, Ni, U, and Zn are 15 ± 8, 109 ± 21, 34 ± 6, 211 ± 55, 142 ± 55, and 161 ± 57 mg kg−1, respectively. On the other hand, the encountered average concentration values of Cd, Cr, Ni, Zn, U, and V in the Phosphate dust particles (<0.053) were found to be 22 ± 5, 179 ± 5, 67 ± 11, 441 ± 14, 225 ± 58, and 311 ± 9 mg kg−1, respectively. The contamination factors of U and Cr are greater than 1, indicating that these heavy metals could be potentially hazardous, if released to the environment. Multivariate statistical analysis allowed the identification of three main factors controlling the distribution of these heavy metals and the other chemical constituents. The extracted factors are as follows: francolite mineral factor, clay minerals factor, and diagenesis factor. Health risk assessments of non-cancerous effects in finer-grained size fraction that might be caused by contamination with the heavy elements have been calculated for both children and adults. The risk assessments in case of children for non-cancerous effects showed that U has values greater than the safe level of hazard index (HI = 1). In case of adults, the value of risk for U is also higher as compared to those of Cd, Ni, Cr, and Zn where it lies within the safe range of hazard index (HI < 1). Child health risk assessment indicates that children are more vulnerable to contaminants from Phosphate mining than adults.

Ghazi Saffarini - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of elemental distribution and heavy metals contamination in Phosphate Deposits: potential health risk assessment of finer-grained size fraction
    Environmental Geochemistry and Health, 2014
    Co-Authors: Mohammad Al-hwaiti, Mustafa Al Kuisi, Ghazi Saffarini, Khitam Alzughoul
    Abstract:

    The concentrations and chemical distributions of heavy metals (Cd, Cr, Ni, Zn, U, and V) in the Al-Jiza Phosphate ores were investigated. Typically, the mean concentration values of Cd, Cr, Ni, U, and Zn are 15 ± 8, 109 ± 21, 34 ± 6, 211 ± 55, 142 ± 55, and 161 ± 57 mg kg^−1, respectively. On the other hand, the encountered average concentration values of Cd, Cr, Ni, Zn, U, and V in the Phosphate dust particles (

  • assessment of elemental distribution and heavy metals contamination in Phosphate Deposits potential health risk assessment of finer grained size fraction
    Environmental Geochemistry and Health, 2014
    Co-Authors: Mohammad Alhwaiti, Mustafa Al Kuisi, Ghazi Saffarini, Khitam Alzughoul
    Abstract:

    The concentrations and chemical distributions of heavy metals (Cd, Cr, Ni, Zn, U, and V) in the Al-Jiza Phosphate ores were investigated. Typically, the mean concentration values of Cd, Cr, Ni, U, and Zn are 15 ± 8, 109 ± 21, 34 ± 6, 211 ± 55, 142 ± 55, and 161 ± 57 mg kg−1, respectively. On the other hand, the encountered average concentration values of Cd, Cr, Ni, Zn, U, and V in the Phosphate dust particles (<0.053) were found to be 22 ± 5, 179 ± 5, 67 ± 11, 441 ± 14, 225 ± 58, and 311 ± 9 mg kg−1, respectively. The contamination factors of U and Cr are greater than 1, indicating that these heavy metals could be potentially hazardous, if released to the environment. Multivariate statistical analysis allowed the identification of three main factors controlling the distribution of these heavy metals and the other chemical constituents. The extracted factors are as follows: francolite mineral factor, clay minerals factor, and diagenesis factor. Health risk assessments of non-cancerous effects in finer-grained size fraction that might be caused by contamination with the heavy elements have been calculated for both children and adults. The risk assessments in case of children for non-cancerous effects showed that U has values greater than the safe level of hazard index (HI = 1). In case of adults, the value of risk for U is also higher as compared to those of Cd, Ni, Cr, and Zn where it lies within the safe range of hazard index (HI < 1). Child health risk assessment indicates that children are more vulnerable to contaminants from Phosphate mining than adults.

S Velmurugan - One of the best experts on this subject based on the ideXlab platform.

  • dissolution of synthetic uranium dibutyl Phosphate Deposits in oxidizing and reducing chemical formulations
    Journal of Hazardous Materials, 2013
    Co-Authors: A L Rufus, V S Sathyaseelan, S V Narasimhan, S Velmurugan
    Abstract:

    Permanganate and nitrilotriacetic acid (NTA) based dilute chemical formulations were evaluated for the dissolution of uranium dibutyl Phosphate (U-DBP), a compound that Deposits over the surfaces of nuclear reprocessing plants and waste storage tanks. A combination of an acidic, oxidizing treatment (nitric acid with permanganate) followed by reducing treatment (NTA based formulation) efficiently dissolved the U-DBP Deposits. The dissolution isotherm of U-DBP in its as precipitated form followed a logarithmic fit. The same chemical treatment was also effective in dissolving U-DBP coated on the surface of 304-stainless steel, while resulting in minimal corrosion of the stainless steel substrate material. Investigation of uranium recovery from the resulting decontamination solutions by ion exchange with a bed of mixed anion and cation resins showed quantitative removal of uranium.