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Now showing items 1 - 3 of 3

  • Onion (Allium cepa L.) is potentially a good source of important antioxidants

    Sidhu, Jiwan S.   Ali, Muslim   Al-Rashdan, Amal   Ahmed, Nissar  

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  • Development of Different Strategies for the Clean-Up of Polychlorinated Biphenyls (PCBs) Congeners Using Pressurized Liquid Extraction

    Al-Rashdan, Amal   Helaleh, Murad I. H.  

    The extracted fish samples (w/w) using pressurized liquid extraction (PLE) were cleaned up by applying different adsorbent materials such as: combination of acidic/basic silica and alumina, florisil, and silica gel either alone or in combination with another sort of sorbent. Different solvents such as hexane (H), dichloromethane (DCM), with different compositions were used to elute the PCBs target compounds from the spiked fish samples. Overall the mean percentage recoveries for all PCBs congeners using PLE were ranging from 78.6% to 98.7%; from 79.4% to 91.8%; from 65.8% to 104.5% and from 82.4% to 100.9% for cases A, B, C, D and E, respectively. However, the overall mean percentage recoveries for the 13C-PCBs surrogate including: 101, 138, 153, 180 and 209 were ranging from 88.2% to 97.6%; from 79.4% to 90.2%, from 88.3% to 96.4%, from 79.8% to 90.4% and from 83.9% to 95.9%, for cases A, B, C, D and E, respectively. The limits of detection of the proposed method were varied from 0.01 to 0.28 ng/g (w/w) for different PCBs congeners. The proposed method has linear dynamic range from 21.5 ng/g to 109 ng/g. This method was applied to fish samples for the determination of the target PCBs components.
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  • Simultaneous Determination of Polycyclic Aromatic Hydrocarbons (PAHs) and Organochlorinated Pesticides (OCPs) in Sewage Sludge Using Gas Chromatography Tandem Mass Spectrometry

    Al-Rashdan, Amal   Helaleh, Murad   Nisar, A.   Al-Ballam, Z.  

    A method has been developed to determine a trace concentration of individual polycyclic aromatic hydrocarbons (PAHs) and organochlorinated pesticides (OCPs) in sewage sludge sample. Sewage sludge samples were collected from three wastewater treatment plants (WWTPs) located at different areas in Kuwait. The new method was based on, utilizing gas chromatography-mass spectrometry with ion trap technique for the simultaneous determination of OCPs and PAHs. The sludge samples were extracted with accelerated solvent extraction (ASE) using (1: 1; v/v) dichloromethane; n-hexane solvent mixture. The extract was passed through a gel permeation chromatography (GPC) followed by silica/Al(2)O(3) column, in order to eliminate the large interferences caused by organic compound and lipid. Sulfur was treated by a non destructive method, such as copper bars added to the extraction thimble before the extraction process. Average concentrations of 5.62 mg kg(-1) of the 16 PAHs and 3.52 mg kg(-1) of the 20 OCPs were found in the sewage sludge sample tested.
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