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  • Determination of Cd and Pb ...
    Magbitang, Riza A; Bucsit, Melanie A; Tia, Eugene SF; Rumbaoa, Grace; Cervas, Lowela Lou M; Dimaya, Danica Angeline; Rodriguez, Irene B

    Science Diliman, 01/2013, Letnik: 25, Številka: 1
    Journal Article

    Metals like cadmium (Cd) and lead (Pb) are introduced in the environment through natural processes and anthropogenic activities and may end up being present in food, where these metals may pose health risks. A method suitable for the simultaneous determination of Cd and Pb in various matrices of foodstuffs was validated and applied to different samples including fruit juice, bottled iced tea, several types of condiments, and in edible tissues of dried fish locally produced in the Philippines. Fruit juice and bottled iced tea samples were filtered prior to quantification of metals using inductively coupled plasma mass spectrometry (ICP-MS). Condiments and dried fish samples were mineralized using microwave-assisted nitric acid digestion before subsequent metal detection with ICP-MS. The method was validated using certified reference materials DORM 3 and NIST 1643e, and evaluation of recovery of spiked samples. The method was linear in the concentration range 0.01 to 500 mu g L-1 with correlation coefficients of 0.999 for both analytes. The estimated detection limits were 0.060 mu gL-1 and 0.186 mu gL-1 for Cd and Pb, respectively. The determined levels of Cd in fruit juice were in the range 0.06 plus or minus 0.01 to 0.67 plus or minus 0.01 mu gL-1, and Pb was detected in only one sample at 0.37 plus or minus 0.02 mu gL-1. For the bottled iced tea samples, Cd was detected in only one sample (0.13 plus or minus 0.02 mu gL1) while none of the samples had detectable Pb concentration. For the condiments, the determined Cd levels were in the range 0.83 plus or minus 0.06 to 306.13 plus or minus 2.52 mu gL-1, whereas the determined Pb levels were in the range 2.14 plus or minus 0.38 to 67.45 plus or minus 7.76 mu gL-1. For the dried fish samples, the Cd levels determined were in the range 2.00 plus or minus 0.21 to 231.67 plus or minus 5.32 mu g kg-1 and that for Pb were in the range 2.38 plus or minus 0.70 to 113.29 plus or minus 2.25 mu g kg-1. These determined levels in different foodstuffs highlight the need for routine monitoring of these contaminants.