Abstract
Heavy metals in waste newspapers produce varying degrees of contamination concerns during food consumption, and when heavy metals levels exceed the permissible level, they become harmful to human. Different types of waste newspapers were analyzed for As, Cd, Cr, Ni, Pb, Al, and Zn by ICP-OES. The digestion solution included 10 ml of 69% nitric acid and 2 ml of 30% hydrogen peroxide. Based on the results for light fonts, the average content of As, Cd, Cr, Ni, and Pb was 2.8, 1.5, 6.9, 5.6, and 5.0 µg/l, while was 3.4 and 0.18 mg/l for Al, and Zn, respectively. In bold fonts, the content of As, Cd, Cr, Ni, and Pb was 4.9, 2.4, 9.1, 7.9, and 7.0 µg/l, respectively, while Al and Zn were 5.7 mg/l and 0.32 mg/l, respectively. In the pictures, the levels of As, Cd, Cr, Ni, and Pb were 6.1, 2.99, 11.2, 9.4, and 8.99 µg/l, while Al and Zn were 8.2 and 0.39 mg/l, respectively. The results showed that all levels of heavy metals under study were within the specialized global councils’ permitted limits.
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Acknowledgements
The authors are thankful to the president of Naif Arab University for Security Sciences, the College of Criminal Justice, and the Department of Forensic Sciences for providing us with full support for this study.
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The Naif Arab University for Security Sciences in Riyadh, Kingdom of Saudi Arabia, contributed to this research.
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Hatem A. Ahmed and Ahmed Saad Gouhar conceived and designed the research, interpreted, analyzed, and discussed the obtained data. Muhammad Naeem Janjua and Nada Alhafez conducted the determination of heavy metals in samples. Hatem A. Ahmed and Ahmed Saad Gouhar collected the samples. Hatem A. Ahmed wrote the manuscript and all authors commented on previous versions of the manuscript. Finally, all authors read and approved the manuscript.
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Ahmed, H.A.M., Gouhar, A.S., Janjua, M.N. et al. Estimation of some heavy metals contamination in waste newspapers. Environ Monit Assess 194, 711 (2022). https://doi.org/10.1007/s10661-022-10215-4
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DOI: https://doi.org/10.1007/s10661-022-10215-4