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چکیده
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This study has been carried out to detect and measure of the heavy metals such as Zinc (Zn), Iron (Fe) Lead (Pb), Copper (Cu), and Cadmium (Cd) in oil products samples. Twenty-one samples were collected from different of warehouses oils in Iraq which include seven samples of gasoline (locally and imported), seven samples of kerosene (locally only), and seven samples of gas oil (locally and imported). The measurements have been done using Atomic Absorption Spectrophotometer (AAS-7000, Shimadzu, Japan). Also, health risk parameters from five heavy metals in the present study were calculated. The average values of concentrations in unit ppm (mg/kg) belonging to Zn, Fe, Pb, Cu, and Cd in gasoline samples were 4.82±1.58, 0.239±0.139, 0.020±0.007, 0.166±0.042, and 0.371±0.048, respectively. While, the average values of concentrations in unit ppm (mg/kg) belonging to Zn, Fe, Pb, Cu, and Cd in kerosene samples were 8.14±1.74, 0.127±0.025, 0.017±0.007, 0.15±0.064, and 0.360±0.022, respectively. Also, it is found that, the average values of concentrations in unit ppm (mg/kg) belonging to Zn, Fe, Pb, Cu, and Cd in gas oil samples were 3.71±0.99, 0.094±0.015, 0.005±0.001, 0.059±0.02, and 0.199±0.015, respectively. The average value of Hazard Index (HI) due to all heave metals in the present work of gasoline, kerosene, and gasoil were 0.78±0.16, 0.721± 0.16, and 0.291±0.05, respectively. Another factor has been calculated which is called the Total Cancer Risk (TCR) due to Cd and Pb which the average values for gasoline, kerosene, and gasoil were 1.36E-03±5.1E-04, 1.12E-03±4.4E-04, and 3.53E-04 ±1.0E-04, respectively. When comparing the results for the present work with Worldwide average, we found that the values were within the recommended values given by UAEPA. As a result, the heavy metals for Iron (Fe), Copper (Cu), Cadmium (Cd), Lead (Pb), and Zinc (Zn) concentrations in the most samples of oil products (gasoline, kerosene, and gasoil) samples studied in this work are Safe for consumption and does not constitute a danger or hazard to the citizens. Fourier transform infrared spectrums indicate that no change on chemical structures between the polymer and the graphite oxide. X-ray diffraction patterns indicate that the prepared sample is polycrystalline structure. Experimental results of the optical properties for the prepared sample showed that the absorbance, transmittance, reflectance, absorption coefficient, extinction coefficient, refractive index, real and imaginary part of dielectric constant, energy gap for indirect transition (allowed and forbidden), and optical conductivity change with changing the wavelength of the incident light. Finally, it can be concluded that after added of the (PPy: GO) nanocomposite to samples of the present study that had high concentrations of iron were decreased directly for different the time of period in magnetic stirrer.
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